Ann-Cecilie Larsen

Researcher - Nuclear and Energy Physics

Norwegian version of this page

Email a.c.larsen@fys.uio.no

Phone +47-22855486

Mobile phone +47-95051841

Room V104

Available hours Anytime

Username

Visiting address 0371 Oslo Sem Sælandsvei 24 Physics building

Postal address Postboks 1048 Blindern 0316 OSLO

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Academic Interests

What happens if the atomic nucleus is heated to several billion degrees?

How were the elements that we know of in the Universe made?

How can nuclear physics save lives?

The nuclear physics group at the Oslo Cyclotron Laboratory (OCL) has developed a method to measure the properties of atomic nuclei at very high temperatures. At these temperatures, the most important properties are the level density, which is how many quantum states available for the nucleus at a given excitation energy, and the gamma-ray strength function, which is a measure of the probability of electromagnetic decay for a certain gamma energy. These two quantities are indispensable for estimating astrophysical reaction rates, which in turn are used for modeling the creation of the various elements in, e.g., supernovae.

New results from the OCL experiments show that some nuclei have an enhanced probability for electromagnetic decay for low-energetic gamma rays. It turns out that these discoveries might have a huge impact on the astrophysical reaction rates of the so-called r-process (rapid neutron capture), which is believed to be the mechanism behind about 50% of the heavy elements we observe in the Universe. Dependent on the models applied in the calculations, the reaction rates can increase up to a factor of 300 for the most neutron-rich nuclei [A. C. Larsen and S. Goriely, Physical Review C 82, 014318 (2010)].

Atomic nuclei may also be used for efficient and precise cancer treatment. By shooting e.g. protons (ionized hydrogen gas) or carbon ions into a tumor, the cancer cells will die while the surrounding healthy tissue will receive a minimal dose compared to conventional radiation treatment. Proton and ion therapy is now a well established method of treatment in many countries, and hopefully this method will also be available for Norwegian cancer patients soon.

Previous teaching

colloquium teacher, FYS-MEK1110 - Mechanics http://www.uio.no/studier/emner/matnat/fys/FYS-MEK1110/index-eng.html
lab teacher, KJM-FYS5920 - Nuclear measurement techniques and instruments http://www.uio.no/studier/emner/matnat/kjemi/KJM-FYS5920/index-eng.html

Higher education and employment history

Cand.mag. in Physics, Dec. 2002, Department of Physics, University of Oslo

Cand.scient. in Nuclear Physics, June 2004, Department of Physics, University of Oslo

Ph.D. in Nuclear Physics, May 2008, Department of Physics, University of Oslo

Research fellow, OCL nuclear physics group, June 2008 - Feb 2009, Department of Physics, University of Oslo

Post.doc., OCL nuclear physics group, Nov. 2009 - Feb 2011, Department of Physics, University of Oslo

Personal postdoc grant, Research Council of Norway, Nov 2011 - Oct 2014, Department of Physics, University of Oslo

Guest researcher, Université Libre de Bruxelles, spring 2013

Guest researcher, UC Berkeley/Lawrence Berkeley National Lab/Lawrence Livermore National Lab, fall 2013

Guest researcher, National Superconducting Cyclotron Laboratory/Michigan State University, summer 2014

Fulbright fellow at the National Superconducting Cyclotron Laboratory/Michigan State University, fall 2016

Fulbright fellow at UC Berkeley/Lawrence Berkeley National Lab, spring 2017

Honoraria

Fulbright Scholarship, 2016-2017

Member of the Norwegian Academy for Science and Letters, 2017-

Prize for Young, Excellent Researchers, Research Council of Norway, fall 2016

Starting Grant (STG-ERC-2014), European Research Council, Grant Agreement No. 637686, 2015-2020

Personal postdoc grant from the Research Council of Norway, Project Grant No. 205528, 2011-2014

Best poster presentation award, Zakopane Conference on Nuclear Physics, 2006

Cooperation

Oslo Syklotronlaboratorium (OCL), http://ocl.uio.no

Université Libre de Bruxelles, http://www.ulb.ac.be/index.html

National Superconducting Cyclotron Laboratory, Michigan State University, http://www.nscl.msu.edu

Lawrence Berkeley National Laboratory, http://www.lbl.gov

Institute of Nuclear Physics NCSR Demokritos, http://www.inp.demokritos.gr/

Edwards Accelerator Laboratory, Ohio University, http://inpp.ohiou.edu/~oual/

Åbo Akademi, http://www.abo.fi/public/

Lawrence Livermore National Laboratory, https://www.llnl.gov/

CERN / ISOLDE

Tags: nuclear astrophysics, detectors, nuclear physics, Instrumentation

Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Midtbø, Jørgen E.; Crespo Campo, Lucia; Görgen, Andreas; Ingeberg, Vetle Wegner; Renstrøm, Therese; Siem, Sunniva; Tveten, Gry Merete; Zeiser, Fabio & Kirsch, Leo (2018). Gamma-widths, lifetimes and fluctuations in the nuclear quasi-continuum. The European Physical Journal Conferences. ISSN 2101-6275. 178(06001) . doi: 10.1051/epjconf/201817806001
Utsunomiya, Hiroaki; Renstrøm, Therese; Tveten, Gry Merete; Gheorghe, Ioana; Filipescu, Dan Mihai; Belyshev, Sergey; Stopani, Konstantin; Wang, Hongwei; Fan, Gongtao; Lui, Yiu-Wing; Symochko, Dmytro; Goriely, Stephane; Larsen, Ann-Cecilie; Siem, Sunniva; Varlamov, Vladimir; Ishkhanov, Boris; Glodariu, Tudor; Krzysiek, Mateusz; Takenaka, Daiki; Ari-Izumi, Takashi; Amano, Sho & Miyamoto, Shuji (2018). Photoneutron Reaction Data for Nuclear Physics and Astrophysics. The European Physical Journal Conferences. ISSN 2101-6275. 178 . doi: 10.1051/epjconf/201817806003
Brits, C.P.; Wiedeking, M.; Bello Garrote, Frank Leonel; Bleuel, D. L.; Giacoppo, F.; Görgen, Andreas; Guttormsen, Magne Sveen; Hadynska-Klek, Katarzyna; Hagen, Trine Wiborg; Ingeberg, Vetle Wegner; Kheswa, Bonginkosi Vincent; Klintefjord, Malin; Larsen, Ann-Cecilie; Malatji, Kgashane L.; Nyhus, Hilde-Therese; Papka, P; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva; Tveten, Gry Merete & Zeiser, Fabio (2017). Resonances in odd-odd 182Ta. The European Physical Journal Conferences. ISSN 2101-6275. 146 . doi: 10.1051/epjconf/201714605012
Crespo Campo, Lucia; Larsen, Ann-Cecilie; Bello Garrote, Frank Leonel; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Görgen, Andreas; Guttormsen, Magne Sveen; Klintefjord, Malin Linnea; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva; Tornyi, Tamas Gabor & Tveten, Gry Merete (2017). Investigating the gamma decay of Ni 65 from particle-gamma coincidence data. Physical Review C. ISSN 2469-9985. 96(1) . doi: 10.1103/PhysRevC.96.014312
Guttormsen, Magne Sveen; Goriely, Stephan; Larsen, Ann-Cecilie; Görgen, Andreas; Hagen, Trine Wiborg; Renstrøm, Therese; Siem, Sunniva; Syed, Naeem Ul Hasan; Tagliente, Giuseppe; Toft, Heidi Kristine; Utsunomiya, Hiroaki; Voinov, Alexander & Wikan, Kristine (2017). Quasicontinuum γ decay of 91,92Zr: Benchmarking indirect (n,γ ) cross section measurements for the s process. Physical Review C. ISSN 2469-9985. 96(2) . doi: 10.1103/PhysRevC.96.024313 Full text in Research Archive.
Kheswa, Bonginkosi Vincent; Wiedeking, Mathis; Brown, Joshua A.; Larsen, Ann-Cecilie; Goriely, Stéphane; Guttormsen, Magne Sveen; Bello Garrote, Frank Leonel; Bernstein, Lee A.; Bleuel, Darren L.; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Görgen, Andreas; Goldblum, Bethany L.; Hagen, Trine Wiborg; Koehler, Paul Edward; Klintefjord, Malin; Malatji, Kgashane L.; Midtbø, Jørgen Eriksson; Nyhus, Hilde-Therese; Papka, P.; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2017). 137,138,139La(n,γ) cross sections constrained with statistical decay properties of 138,139,140La nuclei. Physical Review C. ISSN 2469-9985. 95(4) . doi: 10.1103/PhysRevC.95.045805 Full text in Research Archive.
Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Blasi, Nives; Bracco, Angela; Camera, Franco; Crespo Campo, Lucia; Eriksen, Tomas Kvalheim; Görgen, Andreas; Hagen, Trine Wiborg; Ingeberg, Vetle Wegner; Kheswa, Bonginkosi Vincent; Leoni, Silvia; Midtbø, Jørgen Eriksson; Million, Bénédicte; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Ruud, Inger Eli; Siem, Sunniva; Tornyi, Tamas Gabor; Tveten, Gry Merete; Voinov, Alexander; Wiedeking, Mathis & Zeiser, Fabio (2017). Low-energy enhancement and fluctuations of γ-ray strength functions in 56,57Fe: test of the Brink–Axel hypothesis. Journal of Physics G: Nuclear and Particle Physics. ISSN 0954-3899. 44(6) . doi: 10.1088/1361-6471/aa644a Full text in Research Archive.
Larsen, Ann-Cecilie; Spyrou, Artemis; Liddick, Sean N.; Guttormsen, Magne Sveen; Ingeberg, Vetle Wegner; Siem, Sunniva; Wiedeking, Mathis; Crider, Benjamin P.; Naqvi, Farheen; Perdikakis, George; Mumpower, Matthew R.; Surman, Rebecca A.; Tveten, Gry Merete; Bleuel, Darren L.; Couture, Aaron J.; Crespo Campo, Lucia; Dombos, Alexander C.; Görgen, Andreas; Lewis, Rebecca; Mosby, Shea; Nikas, Stylianos; Prokop, Christopher; Quinn, Stephen; Renstrøm, Therese & Rubio, Berta (2017). Novel Techniques for Constraining Neutron-capture Rates relevant to Heavy-element Nucleosynthesis. PoS - Proceedings of Science. ISSN 1824-8039. INPC2016
Malatji, Kgashane L.; Kheswa, Bonginkosi Vincent; Wiedeking, M.; Bello Garrote, Frank Leonel; Brits, C.P.; Bleuel, D. L.; Giacoppo, Francesca; Görgen, Andreas; Guttormsen, Magne Sveen; Hadynska-Klek, Katarzyna; Hagen, Trine Wiborg; Ingeberg, Vetle Wegner; Klintefjord, Malin; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva; Tveten, Gry Merete & Zeiser, Fabio (2017). Nuclear level densities and γ-ray strength functions of 180,181Ta and neutron capture cross sections. The European Physical Journal Conferences. ISSN 2101-6275. 146 . doi: 10.1051/epjconf/201714601010
Rose, Sunniva Johanne; Zeiser, Fabio; Wilson, JN; Oberstedt, A; Oberstedt, S; Siem, Sunniva; Tveten, Gry Merete; Bernstein, LA; Bleuel, DL; Brown, JA; Crespo Campo, Lucia; Giacoppo, Francesca; Görgen, Andreas; Guttormsen, Magne Sveen; Hadynska-Klek, Katarzyna; Hafreager, Anders; Hagen, Trine Wiborg; Klintefjord, Malin Linnea; Laplace, TA; Larsen, Ann-Cecilie; Renstrøm, Therese; Sahin, Eda; Schmitt, C; Tornyi, Tamas Gabor & Wiedeking, M (2017). Energy dependence of the prompt gamma-ray emission from the (d,p)-induced fission of U-234 and Pu-240. Physical Review C. ISSN 2469-9985. 96(1) . doi: 10.1103/PhysRevC.96.014601
Spyrou, Artemis; Larsen, Ann-Cecilie; Liddick, Sean N.; Naqvi, Farheen; Crider, Benjamin P.; Dombos, Alexander C.; Guttormsen, Magne Sveen; Bleuel, Darren L.; Couture, Aaron J.; Crespo Campo, Lucia; Lewis, Rebecca; Mosby, Shea; Mumpower, Matthew R.; Perdikakis, George; Prokop, Christopher; Quinn, Stephen; Renstrøm, Therese; Siem, Sunniva & Surman, Rebecca A. (2017). Neutron-capture rates for explosive nucleosynthesis: the case of 68Ni(n, γ)69Ni. Journal of Physics G: Nuclear and Particle Physics. ISSN 0954-3899. 44 . doi: 10.1088/1361-6471/aa5ae7 Full text in Research Archive.
Tveten, Gry Merete; Spyrou, Artemis; Schwengner, Ronald; Naqvi, Farheen; Larsen, Ann-Cecilie; Renstrøm, Therese; Eriksen, Tomas Kvalheim; Bello Garrote, Frank Leonel; Bernstein, Lee A.; Bleuel, Darren L.; Crespo Campo, Lucia; Guttormsen, Magne Sveen; Giacoppo, Francesca; Görgen, Andreas; Hagen, Trine Wiborg; Hadynska-Klek, Katarzyna; Klintefjord, Malin; meyer, b. s.; Nyhus, Hilde-Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2017). The Statistical Properties Of 92Mo And Implications For The p-process. PoS - Proceedings of Science. ISSN 1824-8039. INPC2016 Full text in Research Archive. Show summary
A particularly challenging part of the question of how elements heavier than iron are created in extreme, astrophysical environments is the creation of the so-called p-nuclei, which are believed to be mainly produced in the O-Ne layer of type II supernovae or type Ia supernovae. The lack of needed nuclear data presents an obstacle in nailing down the precise site and astrophysical conditions for the production of these isotopes. Astrophysical model calculations are able to reproduce abundance patterns of most p-isotopes reasonably well, with some pivotal exceptions. In particular, p-isotopes of mass 92 ≤ A ≤ 98 are underproduced in calculations compared to the actual abundance of these isotopes. The p-isotope 92Mo represents one of the most severe cases of underproduction. State-of-the-art p-process calculations systematically underestimate the observed solar abundance of this isotope. The main destruction mechanism of this isotope in the standard description of the p-process is through the 92Mo(γ, p)91Nb reaction. Measurements on the nuclear level density and average gamma strength function of 92Mo have been carried out at the Oslo Cyclotron Laboratory. TALYS cross section and reaction rate calculations where the experimental results are used as input will be presented. The data provide stringent constraints on the 91Nb(p, γ)92Mo (and consequently the inverse) reaction rate. The reaction rate extracted in this work was used in reaction network calculations for the scenario of a p-process taking place in a type II supernova explosion as the shock front passes through the O-Ne layer of a 25 solar mass star.
Wiedeking, Mathis; Bernstein, Lee A.; Bleuel, Darren L.; Brits, Christiaan Petrus; Sowazi, Khanyisa; Görgen, Andreas; Goldblum, Bethany L.; Guttormsen, Magne Sveen; Kheswa, Bonginkosi Vincent; Larsen, Ann-Cecilie; Majola, Siyabonga N.T.; Malatji, Kgashane Leroy; Negi, Dinesh; Nogwanya, Thembalethu; Siem, Sunniva & Zikhali, Bonginkosi Richard (2017). Statistical gamma-ray decay studies at iThemba LABS. The European Physical Journal Conferences. ISSN 2101-6275. 146:05006, s 1- 4 . doi: 10.1051/epjconf/201714605006
Ay, K.o.; Ozgur, Mustafa; Algin, Emel; Guttormsen, Magne Sveen; Bello Garrote, Frank Leonel; Crespo Campo, Lucia; Görgen, Andreas; Hagen, Trine Wiborg; Ingeberg, Vetle Wegner; Kheswa, Bonginkosi Vincent; Klintefjord, Malin; Larsen, Ann-Cecilie; Midtbø, Jørgen Eriksson; Modamio, Victor Høybjør; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva; Tveten, Gry Merete & Zeiser, Fabio (2016). Nuclear level densities and gamma-ray strength functions of 145,149,151Nd isotopes. Journal of Physics, Conference Series. ISSN 1742-6588. 766(012027) . doi: 10.1088/1742-6596/766/1/012027
Clement, E; Zielinska, Magdalena; Péru, Sophie; Goutte, Héloïse; Hilaire, Stephane; Görgen, Andreas; Korten, Wolfram; Doherty, Daniel T.; Bastin, Beyhan; Bauer, C; Blazhev, A; Bree, N; Bruyneel, Bart; Butler, Peter A.; Butterworth, J; Cederkall, Joakim; Delahaye, P; Dijon, Aurore; Ekstrom, A; Fitzpatrick, C; Fransen, C.; Georgiev, Georgi; Gernhauser, Roman; Hess, H; Iwanicki, J.; Jenkins, David G.; Larsen, Ann-Cecilie; Ljungvall, Joa; Lutter, R; Marley, P.; Moschner, K.; Napiorkowski, P. J.; Pakarinen, J.; Petts, A; Reiter, Peter; Renstrøm, Therese; Seidlitz, M; Siebeck, B.; Siem, Sunniva; Sotty, Christophe; Srebrny, Julian; Stefanescu, I.; Tveten, Gry Merete; Van de Walle, Jarno; Vermeulen, M; Voulot, Didier; Warr, Nigel; Wenander, Fredrik; Wiens, Andreas; De Witte, H. & Wrzosek, K. (2016). Low-energy Coulomb excitation of 96,98Sr beams. Physical Review C. Nuclear Physics. ISSN 0556-2813. 94(5) . doi: 10.1103/PhysRevC.94.054326
Clément, Emmanuel; Zielińska, Magdalena; Görgen, Andreas; Körten, Wolfram; Péru, Sophie; Libert, Jacques J.; Goutte, Héloïse; Hilaire, Stéphane; Bastin, Beyhan; Bauer, Clemens; Blazhev, Andrey; Bree, Nick; Bruyneel, Bart; Butler, Peter A.; Butterworth, James E.; Delahaye, Pierre; Dijon, Aurore; Doherty, Daniel T.; Ekström, Andreas; Fitzpatrick, Conor; Fransen, Christoph; Georgiev, Georgi; Gernhäuser, ROMAN; Hess, Herbert; Iwanicki, Jêdrzej; Jenkins, David G.; Larsen, Ann-Cecilie; Ljungvall, Joa; Lutter, Rudolph; Marley, P.; Moschner, Kevin; Napiorkowski, Paweł Jan; Pakarinen, Janne A.; Petts, Andrew; Reiter, Peter; Renstrøm, Therese; Seidlitz, Michael; Siebeck, Burkhard; Siem, Sunniva; Sotty, Christophe; Srebrny, Julian; Ştefǎnescu, Ioan; Tveten, Gry Merete; Van De Walle, Jean V.; Vermeulen, Martien J.W.; Voulot, Didier; Warr, Nigel V.; Wenander, Fredrik; Wiens, Andreas; De Witte, Hans & Wrzosek-Lipska, Katarzyna (2016). Spectroscopic Quadrupole Moments in Sr 96,98: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N=60. Physical Review Letters. ISSN 0031-9007. 116:022701(2) . doi: 10.1103/PhysRevLett.116.022701
Crespo Campo, Lucia; Bello Garrote, Frank Leonel; Eriksen, Tomas Kvalheim; Görgen, Andreas; Guttormsen, Magne Sveen; Hadynska-Klek, Katarzyna; Klintefjord, Malin; Larsen, Ann-Cecilie; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva; Springer, A; Tornyi, Tamas Gabor & Tveten, Gry Merete (2016). Statistical γ -decay properties of Ni 64 and deduced (n,γ) cross section of the s -process branch-point nucleus Ni 63. Physical Review C. Nuclear Physics. ISSN 0556-2813. 94(4) . doi: 10.1103/PhysRevC.94.044321
Ducasse, Q; Jurado, B; Aiche, M; Marini, P; Mathieu, L; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Tornyi, Tamas Gabor; Wilson, JN; Barreau, G; Boutoux, G; Czajkowski, S; Giacoppo, Francesca; Gunsing, F; Hagen, Trine Wiborg; Lebois, M; Lei, J; Meot, V; Morillon, B; Moro, AM; Renstrøm, Therese; Roig, O; Rose, Sunniva Johanne; Serot, O; Siem, Sunniva; Tsekhanovich, I; Tveten, Gry Merete & Wiedeking, M (2016). Investigation of the U 238 (d,p) surrogate reaction via the simultaneous measurement of γ -decay and fission probabilities. Physical Review C. Nuclear Physics. ISSN 0556-2813. 94(2) . doi: 10.1103/PhysRevC.94.024614
Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Görgen, Andreas; Renstrøm, Therese; Siem, Sunniva; Tornyi, Tamas Gabor & Tveten, Gry Merete (2016). Is the generalized Brink-Axel hypothesis valid?. PoS - Proceedings of Science. ISSN 1824-8039. 2016-September, s 1- 8
Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Görgen, Andreas; Renstrøm, Therese; Siem, Sunniva; Tornyi, Tamas Gabor & Tveten, Gry Merete (2016). Validity of the Generalized Brink-Axel Hypothesis in Np 238. Physical Review Letters. ISSN 0031-9007. 116(1) . doi: 10.1103/PhysRevLett.116.012502
Klintefjord, Malin; Hadynska-Klek, Katarzyna; Görgen, Andreas; Bauer, C; Bello Garrote, Frank Leonel; Bönig, S; Bounthong, B; Damyanova, A; Delaroche, Jean Paul; Fedosseev, V; Fink, D. A.; Giacoppo, Francesca; Girod, M; Hoff, Per; Imai, N; Korten, Wolfram; Larsen, Ann-Cecilie; Libert, J; Lutter, R; Marsh, B. A.; Molkanov, P. L.; Naïdja, Houda; Napiorkowski, P; Nowacki, F; Pakarinen, J; Rapisarda, E; Reiter, P; Renstrøm, Therese; Rothe, S; Seliverstov, M. D.; Siebeck, B; Siem, Sunniva; Srebrny, Julian; Stora, T; Thöle, P; Tornyi, Tamas Gabor; Tveten, Gry Merete; Van Duppen, P; Vermeulen, MJ; Voulot, D; Warr, Nigel; Wenander, F; De Witte, H & Zielinska, M (2016). Structure of low-lying states in Sm140 studied by Coulomb excitation. Physical Review C. Nuclear Physics. ISSN 0556-2813. 93(5) . doi: 10.1103/PhysRevC.93.054303
Laplace, Thibault A.; Zeiser, Fabio; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bleuel, Darren L.; Bernstein, Lee A.; Goldblum, Bethany L.; Siem, Sunniva; Bello Garrote, Frank Leonel; Brown, Joshua A.; Crespo Campo, Lucia; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Gorgen, Andreas; Hadynska-Klek, Katarzyna; Henderson, Roger A.; Klintefjord, Malin; Lebois, Matthieu; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Tornyi, Tamas Gabor; Tveten, Gry Merete; Voinov, Alexander; Wiedeking, Mathis; Wilson, Jonathan & Younes, Walid (2016). Statistical properties of Pu 243, and Pu 242 (n,γ) cross section calculation. Physical Review C. Nuclear Physics. ISSN 0556-2813. 93(1) . doi: 10.1103/PhysRevC.93.014323
Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Schwengner, Ronald; Bleuel, Darren L.; Goriely, Stephane; Harrisopulos, Sotirios; Bello Garrote, Frank Leonel; Byun, Y.; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Görgen, Andreas; Hagen, Trine Wiborg; Klintefjord, Malin; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva; Tornyi, Tamas Gabor; Tveten, Gry Merete; Voinov, Alexander & Wiedeking, Mathis (2016). Experimentally constrained (p,γ) y 89 and (n,γ) y 89 reaction rates relevant to p -process nucleosynthesis. Physical Review C. Nuclear Physics. ISSN 0556-2813. 93(4) . doi: 10.1103/PhysRevC.93.045810
Larsen, Ann-Cecilie; Spyrou, Artemisia; Liddick, Sean N.; Guttormsen, Magne Sveen; Ingeberg, Vetle Wegner; Siem, Sunniva; Wiedeking, Mathis; Crider, Benjamin P.; Naqvi, Farheen; Perdikakis, Georgios; Mumpower, Matthew R.; Surman, Rebecca A.; Tveten, Gry Merete; Bleuel, Darren L.; Couture, Aaron J.; Crespo Campo, Lucia; Dombos, Alexander C.; Görgen, Andreas; Lewis, Raymond A.; Mosby, Shea M.; Nikas, Stylianos; Prokop, Christopher J.; Quinn, Simon J.; Renstrøm, Therese & Rubio, Berta (2016). Novel techniques for constraining neutron-capture rates relevant to heavy-element nucleosynthesis. PoS - Proceedings of Science. ISSN 1824-8039. 2016-September:360, s 1- 9
Liddick, Sean N.; Spyrou, Artemisia; Crider, Benjamin P.; Naqvi, Farheen; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Mumpower, Matthew R.; Surman, Rebecca A.; Perdikakis, Georgios; Bleuel, Darren L.; Couture, Aaron J.; Crespo Campo, Lucia; Dombos, Alexander C.; Lewis, Rob; Mosby, Shea; Nikas, Stylianos; Prokop, Christopher; Renstrøm, Therese; Rubio, Berta; Siem, Sunniva & Quinn, Simon J. (2016). Experimental Neutron Capture Rate Constraint Far from Stability. Physical Review Letters. ISSN 0031-9007. 116:242502(24) . doi: 10.1103/PhysRevLett.116.242502
Marini, P.; Ducasse, Q; Jurado, B; Aiche, M; Mathieu, L; Barreau, G.; Czajkowski, S; Tsekhanovich, I; Moro, A; Lei, J; Giacoppo, Francesca; Görgen, Andreas; Tornyi, Tamas Gabor; Audouin, L; Tassan-Got, L; Wilson, J. N.; Gunsing, F.; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Lebois, M; Renstrøm, Therese; Rose, Sunniva Johanne; Siem, Sunniva; Tveten, Gry Merete; Wiedeking, M.; Serot, O; Boutoux, G; Meot, V; Morillon, B; Denis-Petit, D; Roig, O; Oberstedt, S & Oberstedt, A (2016). First simultaneous measurement of fission and gamma probabilities of 237U and 239Np via surrogate reactions. The European Physical Journal Conferences. ISSN 2101-6275. 122 . doi: 10.1051/epjconf/201612212004
Negi, D; Wiedeking, M; Lanza, EG; Litvinova, E; Vitturi, A; Bark, RA; Bernstein, LA; Bleuel, DL; Bvumbi, S; Bucher, TD; Daub, BH; Dinoko, TS; Easton, JL; Görgen, Andreas; Guttormsen, Magne Sveen; Jones, P; Kheswa, BV; Khumalo, NA; Larsen, Ann-Cecilie; Lawrie, EA; Lawrie, JJ; Majola, SNT; Masiteng, LP; Nchodu, MR; Ndayishimye, J; Newman, RT; Noncolela, SP; Orce, JN; Papka, P; Pellegri, L; Renstrøm, Therese; Roux, DG; Schwengner, R; Shirinda, O & Siem, Sunniva (2016). Nature of low-lying electric dipole resonance excitations in Ge 74. Physical Review C. Nuclear Physics. ISSN 0556-2813. 94(2) . doi: 10.1103/PhysRevC.94.024332
Renstrøm, Therese; Nyhus, Hilde-Therese; Utsunomiya, Hiroaki; Schwengner, Ronald; Goriely, Stephane; Larsen, Ann-Cecilie; Filipescu, Dan Mihai; Gheorghe, Ioana; Bernstein, L. A.; Bleuel, Darren L.; Glodariu, T.; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Kheswa, Bonginkosi Vincent; Lui, Y.-W.; Negi, Dinesh; Ruud, Inger Eli; Shima, T.; Siem, Sunniva; Takahisa, K.; Tesileanu, O.; Tornyi, Tamas Gabor; Tveten, Gry Merete & Wiedeking, Mathis (2016). Low-energy enhancement in the γ-ray strength functions of Ge73,74. Physical Review C. Nuclear Physics. ISSN 0556-2813. 93(6) . doi: 10.1103/PhysRevC.93.064302
Simon, Anna; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Beausang, Con W.; Humby, Peter; Burke, Jason T.; Casperson, Robert J.; Hughes, R.O.; Ross, Tim J.; Allmond, James Mitchell; Chyzh, R.; Dag, M.; Koglin, Jason M.; McCleskey, E.; McCleskey, Matt; Ota, Shuya & Saastamoinen, Antti (2016). First observation of low-energy γ -ray enhancement in the rare-earth region. Physical Review C. Nuclear Physics. ISSN 0556-2813. 93:034303 . doi: 10.1103/PhysRevC.93.034303
Spyrou, Artemis; Liddick, Sean N.; Naqvi, Farheen; Crider, Benjamin P.; Dombos, Alexander C.; Bleuel, Darren L.; Brown, B.Alex; Couture, Aaron J.; Crespo Campo, Lucia; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Lewis, Rebecca; Möller, P.; Mosby, Shea; Mumpower, Matthew R.; Perdikakis, Georgios; Prokop, C. J.; Renstrøm, Therese; Siem, Sunniva; Quinn, S. J. & Valenta, S (2016). Strong Neutron-γ Competition above the Neutron Threshold in the Decay of 70Co. Physical Review Letters. ISSN 0031-9007. 117(14) . doi: 10.1103/PhysRevLett.117.142701
Tveten, Gry Merete; Spyrou, A; Schwengner, R; Naqvi, F; Larsen, Ann-Cecilie; Eriksen, Tomas Kvalheim; Bello Garrote, Frank Leonel; Bernstein, LA; Bleuel, DL; Crespo Campo, Lucia; Guttormsen, Magne Sveen; Giacoppo, Francesca; Görgen, Andreas; Hagen, Trine Wiborg; Hadynska-Klek, Katarzyna; Klintefjord, Malin; Meyer, BS; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2016). Completing the nuclear reaction puzzle of the nucleosynthesis of Mo 92. Physical Review C. Nuclear Physics. ISSN 0556-2813. 94(2) . doi: 10.1103/PhysRevC.94.025804
Tveten, Gry Merete; Spyrou, Artemis; Schwengner, Ronald; Naqvi, Farheen; Larsen, Ann-Cecilie; Renstrøm, Therese; Eriksen, Tomas Kvalheim; Bello Garrote, Frank Leonel; Bernstein, Lee A.; Bleuel, Darren L.; Crespo Campo, Lucia; Guttormsen, Magne Sveen; Giacoppo, Francesca; Görgen, Andreas; Hagen, Trine Wiborg; Hadynska-Klek, Katarzyna; Klintefjord, Malin; Meyer, Bradley S.; Nyhus, Hilde-Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2016). The statistical properties of 92Mo and implications for the p-process. PoS - Proceedings of Science. ISSN 1824-8039. 2016-September:163
Wiedeking, Mathis; Krtička, M.; Bernstein, L. A.; Allmond, J. M.; Basunia, M. S.; Bleuel, Darren L.; Burke, J. T.; Daub, B. H.; Fallon, Paul; Firestone, R.B.; Goldblum, Bethany L.; Hatarik, R.; Lake, P. T.; Larsen, Ann-Cecilie; Lee, I.-Y.; Lescher, S. R.; Paschalis, S.; Petri, M.; Phair, L.; Scielzo, N. D. & Volya, A. (2016). γ-ray decay from neutron-bound and unbound states in Mo 95 and a novel technique for spin determination. Physical Review C. Nuclear Physics. ISSN 0556-2813. 93(2) . doi: 10.1103/PhysRevC.93.024303
Bello Garrote, Frank Leonel; Görgen, Andreas; Mierzejewski, Jan; Mihai, Corina Mihaela; Delaroche, Jean Paul; Girod, Michel; Libert, Jacques J.; Sahin, Eda; Srebrny, Julian; Abraham, Theodore J.; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Hagen, Trine Wiborg; Kisieliński, Maciej; Klintefjord, Malin; Komorowska, Małgorzata; Kowalczyk, Maciej; Larsen, Ann-Cecilie; Marchlewski, Tomasz; Mitu, Iani Octavian; Pascu, Sorin; Siem, Sunniva; Stolarz, Anna & Tornyi, Tamas Gabor (2015). Lifetime measurement for the 21+ state in Sm 140 and the onset of collectivity in neutron-deficient Sm isotopes. Physical Review C. Nuclear Physics. ISSN 0556-2813. 92:024317(2) . doi: 10.1103/PhysRevC.92.024317
Giacoppo, Francesca; Bello Garrote, Frank Leonel; Bernstein, Lee; Bleuel, D.l.; Firestone, R.B.; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Klintefjord, Malin; Koehler, Paul Edward; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2015). Gamma decay from the quasicontinuum of 197,198Au. Physical Review C. Nuclear Physics. ISSN 0556-2813. 91 . doi: 10.1103/PhysRevC.91.054327
Giacoppo, Francesca; Garrote, F. L. Bello; Eriksen, Tomas Kvalheim; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Kheswa, Bonginkosi Vincent; Klintefjord, Malin; Koehler, Paul Edward; Moretto, Luciano; Nyhus, Hilde-Therese; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2015). Observation of low-lying resonances in the quasicontinuum of Pt-195,Pt-196 and enhanced astrophysical reaction rates. The European Physical Journal Conferences. ISSN 2101-6275. 93 . doi: 0.1051/epjconf/20159301039
Guttormsen, Magne Sveen; Aiche, M; Bello Garrote, Frank Leonel; Bernstein, Lee; Bleuel, D.l.; Byun, Y.; Ducasse, Q; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Görgen, Andreas; Gunsing, Frank; Hagen, Trine Wiborg; Jurado, B; Klintefjord, Malin; Larsen, Ann-Cecilie; Lebois, L.; Leniau, Baptist; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva; Tornyi, Tamas Gabor; Tveten, Gry Merete; Voinov, Alexander; Wiedeking, Mathis & Wilson, Jonathan (2015). Experimental level densities of atomic nuclei. European Physical Journal A. ISSN 1434-6001. 51(12), s 1- 8 . doi: 10.1140/epja/i2015-15170-4
Kheswa, Bonginkosi Vincent; Wiedeking, Mathis; Giacoppo, Francesca; Goriely, Stephan; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bello Garrote, Frank Leonel; Eriksen, Tomas Kvalheim; Görgen, Andreas; Hagen, Trine Wiborg; Koehler, Paul Edward; Klintefjord, Malin; Nyhus, Hilde-Therese; Papka, P.; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2015). Galactic production of 138La: Impact of 138,139La statistical properties. Physics Letters B. ISSN 0370-2693. 744, s 268- 272 . doi: 10.1016/j.physletb.2015.03.065
Kheswa, Bonginkosi Vincent; Wiedeking, Mathis; Giacoppo, Francesca; Goriely, Stephane; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Garrote, F. L. Bello; Eriksen, Tomas Kvalheim; Görgen, Andreas; Hagen, Trine Wiborg; Koehler, Paul Edward; Klintefjord, Malin; Nyhus, Hilde-Therese; Papka, P.; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2015). Statistical nuclear properties and synthesis of La-138. The European Physical Journal Conferences. ISSN 2101-6275. 93 . doi: 10.1051/epjconf/20159304005
Klintefjord, Malin; Hadynska-Klek, Katarzyna; Samorajczyk, J; Görgen, Andreas; Droste, C; Srebrny, J; Abraham, T; Bauer, C; Bello Garrote, Frank Leonel; Bönig, S; Damyanova, A; Giacoppo, Francesca; Grodner, E; Hoff, Per; Kisielinski, M; Komorowska, M; Korten, W; Kowalczyk, M; Kownacki, J; Larsen, Ann-Cecilie; Lutter, R; Marchlewski, T; Napiorkowski, P; Pakarinen, J; Rapisarda, E; Reiter, P; Renstrøm, Therese; Siebeck, B; Siem, Sunniva; Stolarz, A; Szenborn, R; Thöle, P; Tornyi, Tamas Gabor; Tucholski, A; Tveten, Gry Merete; Van Duppen, P; Vermeulen, MJ; Warr, N; De Witte, H & Zielinska, M (2015). Spectroscopy of low-lying states in 140Sm. Acta Physica Polonica B. ISSN 0587-4254. 46(3), s 607- 611 . doi: 10.5506/APhysPolB.46.607
Larsen, Ann-Cecilie; Goriely, Stephane; Bernstein, L. A.; Bleuel, D. L.; Bracco, A.; Brown, B. A.; Camera, F.; Eriksen, Tomas Kvalheim; Frauendorf, Stefan; Giacoppo, Francesca; Guttormsen, Magne Sveen; Görgen, Andreas; Harrisopulos, Sotirios; Leoni, S.; Liddick, S. N.; Naqvi, F.; Nyhus, Hilde-Therese; Rose, Sunniva Johanne; Renstrøm, Therese; Schwengner, Ronald; Siem, Sunniva; Spyrou, A.; Tveten, Gry Merete; Voinov, Alexander & Wiedeking, Mathis (2015). Upbend and M1 scissors mode in neutron-rich nuclei — consequences for r-process (n,gamma) reaction rates. Acta Physica Polonica B. ISSN 0587-4254. 46(3), s 509- 512 . doi: 10.5506/APhysPolB.46.509
Moretto, L.G.; Larsen, Ann-Cecilie; Giacoppo, Francesca; Guttormsen, Magne Sveen & Siem, Sunniva (2015). Experimental first order pairing phase transition in atomic nuclei. Journal of Physics, Conference Series. ISSN 1742-6588. 580:012048, s 1- 7 . doi: 10.1088/1742-6596/580/1/012048
Moretto, Luciano; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen & Siem, Sunniva (2015). The little hagedorn that could. PoS - Proceedings of Science. ISSN 1824-8039. 26-30-January-2015:058
Renstrøm, Therese; Nyhus, Hilde-Therese; Utsunomiya, Hiroaki; Larsen, Ann-Cecilie; Siem, Sunniva; Guttormsen, Magne Sveen; Filipescu, Dan Mihai; Gheorghe, I.; Goriely, Stephane; Bernstein, L. A.; Bleuel, Darren L.; Glodariu, T.; Görgen, Andreas; Hagen, Trine Wiborg; Lui, Y.-W.; Negi, Dinesh; Ruud, Inger Eli; Sahin, Eda; Schwengner, Ronald; Shima, T.; Takahisa, K.; Tesileanu, O.; Tornyi, Tamas Gabor; Tveten, Gry Merete & Wiedeking, Mathis (2015). First evidence of low energy enhancement in Ge isotopes. The European Physical Journal Conferences. ISSN 2101-6275. 93 . doi: 10.1051/epiconf/20159304003
Schwengner, Ronald; Frauendorf, Stefan & Larsen, Ann-Cecilie (2015). Low-energy enhancement of M1 strength. Journal of Physics, Conference Series. ISSN 1742-6588. 580:012020, s 1- 7 . doi: 10.1088/1742-6596/580/1/012020
Tveten, Gry Merete; Bello Garrote, Frank Leonel; Crespo Campo, Lucia; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Guttormsen, Magne Sveen; Görgen, Andreas; Hagen, Trine Wiborg; Hadynska-Klek, Katarzyna; Klintefjord, Malin; Larsen, Ann-Cecilie; Maharramova, Sabina Abulfaz; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2015). The statistical properties of 111,112,113Sn studied with the Oslo method. The European Physical Journal Conferences. ISSN 2101-6275. 93 . doi: 10.1051/epjconf/20159304004
Bree, Nick; Wrzosek-Lipska, K; Petts, A; Andreyev, A; Bastin, B; Bender, M; Blazhev, A; Bruyneel, B; Butler, PA; Butterworth, J; Carpenter, MP; Cederkäll, J; Clement, E; Cocolios, TE; Deacon, A; Diriken, J; Ekström, A; Fitzpatrick, C; Fraile, LM; Fransen, Ch; Freeman, SJ; Gaffney, LP; Garcia-Ramos, JE; Geibel, K; Gernhäuser, R; Grahn, T; Guttormsen, Magne Sveen; Hadinia, B; Hadynska-Klek, K; Hass, M; Heenen, PH; Herzberg, RD; Hess, H; Heyde, K; Huyse, M; Ivanov, O; Jenkins, DG; Julin, R; Kesteloot, N; Kröll, Th; Krucken, R; Larsen, Ann-Cecilie; Lutter, R; Marley, P; Napiorkowski, PJ; Orlandi, R; Page, RD; Pakarinen, J; Patronis, N; Peura, PJ; Piselli, E; Rahkila, P; Rapisarda, E; Reiter, P; Robinson, AP; Scheck, M; Siem, Sunniva; Singh Chakkal, K; Smith, JF; Srebrny, J; Stefanescu, I; Tveten, Gry Merete; Van Duppen, P; Van De Walle, J; Voulot, D; Warr, N; Wenander, F; Wiens, A; Wood, JL & Zielinska, M (2014). Shape coexistence in the neutron-deficient even-even hg 182-188 isotopes studied via coulomb excitation. Physical Review Letters. ISSN 0031-9007. 112:162701(16) . doi: 10.1103/PhysRevLett.112.162701
Brown, B.Alex & Larsen, Ann-Cecilie (2014). Large low-energy M1 strength for Fe 56,57 within the nuclear shell model. Physical Review Letters. ISSN 0031-9007. 113(25) . doi: 10.1103/PhysRevLett.113.252502
Clément, Etebong Peter; Görgen, Andreas; Dijon, A; De France, G; Bastin, B; Blazhev, A; Bree, N; Butler, P; Delahaye, P; Ekstrom, A; Georgiev, G; Syed, Naeem Ul Hasan; Iwanicki, J; Jenkins, D; Korten, W; Larsen, Ann-Cecilie; Ljungvall, J; Moschner, K; Napiorkowski, P; Pakarinen, J; Petts, A; Renstrøm, Therese; Seidlitz, M; Siem, Sunniva; Sotty, C; Srebrny, J; Stefanescu, I; Tveten, Gry Merete; Van De Walle, J; Warr, N; Wrzosek-Lipska, K; Zielinska, M; Bauer, C; Bruyneel, B; Butterworth, J; Fitzpatrick, C; Fransen, C; Gernhäuser, R; Hess, H; Lutter, R; Marley, P; Reiter, P; Siebeck, B; Vermeulen, M; Wiens, A & De Witte, H (2014). Onset of collectivity in 96,98Sr studied via Coulomb excitation. The European Physical Journal Conferences. ISSN 2101-6275. 66:02021 . doi: 10.1051/epjconf/20146602021
Ducasse, Quentin; Jurado, Beatriz; Tornyi, Tamas Gabor; Görgen, Andreas; Wilson, J.D.; Giacoppo, Francesca; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Renstrøm, Therese; Rose, Sunniva Johanne; Siem, Sunniva; Tveten, Gry Merete; Hagen, Trine Wiborg; Wiedeking, M.; Aiche, M; Mathieu, L; Wilson, J.N.; Barreau, G.; Companis, I; Czajkowski, S; Gunsing, F.; Lebois, M; Matarranz, J; Serot, O; Boutoux, G; Chau, P; Meot, V & Roig, O (2014). Neutron-induced Cross Sections of Actinides via the Surrogate-reaction Method. Nuclear Data Sheets. ISSN 0090-3752. 119, s 233 . doi: 10.1016/j.nds.2014.08.064
Eriksen, Tomas Kvalheim; Nyhus, Hilde-Therese; Guttormsen, Magne Sveen; Görgen, Andreas; Larsen, Ann-Cecilie; Renstrøm, Therese; Ruud, Inger Eli; Siem, Sunniva; Toft, Heidi Kristine; Tveten, Gry Merete & Wilson, Jonathan (2014). Pygmy resonance and low-energy enhancement in the γ-ray strength functions of Pd isotopes. Physical Review C. Nuclear Physics. ISSN 0556-2813. 90(044311) . doi: 10.1103/PhysRevC.90.044311
Giacoppo, Francesca; Bello Garrote, Frank Leonel; Bernstein, L. A.; Bleuel, D. L.; Eriksen, Tomas Kvalheim; Firestone, Richard; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Kheswa, Bonginkosi Vincent; Klintefjord, Malin; Koehler, Paul Edward; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2014). Level densities and thermodynamical properties of Pt and Au isotopes. Physical Review C. Nuclear Physics. ISSN 0556-2813. 90(5) . doi: 10.1103/PhysRevC.90.054330 Full text in Research Archive.
Giacoppo, Francesca; Bello Garrote, Frank Leonel; Bernstein, Lee A.; Bleuel, Darren L.; Firestone, Richard; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Klintefjord, Malin; Koehler, Paul Edward; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2014). Statistical gamma-ray emission of gold and its astrophysical implications. The European Physical Journal Conferences. ISSN 2101-6275. 66:02041 . doi: 10.1051/epjconf/20146602041
Guttormsen, Magne Sveen; Bernstein, L. A.; Bürger, Alexander; Görgen, Andreas; Gunsing, F.; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Renstrøm, Therese; Siem, Sunniva; Wiedeking, M. & Wilson, J. N. (2014). Scissors strength in the quasi-continuum of actinides. The European Physical Journal Conferences. ISSN 2101-6275. 66 . doi: 10.1051/epjconf/20146602044
Guttormsen, Magne Sveen; Bernstein, Lee; Görgen, Andreas; Jurado, Beatriz; Siem, Sunniva; Aiche, M; Ducasse, Quentin; Giacoppo, Francesca; Gunsing, Frank; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Lebois, M; Leniau, Baptist; Renstrøm, Therese; Rose, Sunniva Johanne; Tornyi, Tamas Gabor; Tveten, Gry Merete; Wiedeking, Mathis & Wilson, Jonathan (2014). Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes. Physical Review C. Nuclear Physics. ISSN 0556-2813. 89(014302) . doi: 10.1103/PhysRevC.89.014302
Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bello Garrote, Frank Leonel; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Görgen, Andreas; Hagen, Trine Wiborg; Klintefjord, Malin; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva; Tornyi, Tamas Gabor; Tveten, Gry Merete & Voinov, Alexander (2014). Shell-gap-reduced level densities in 89,90Y. Physical Review C. Nuclear Physics. ISSN 0556-2813. 90(044309) . doi: 10.1103/PhysRevC.90.044309
Krzysiek, M; Bürger, Alexander; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Siem, Sunniva; Kmiecik, M.; Maj, A.; Bednarczyk, P.; Ciemala, M.; Fornal, B.; Grebosz, J.; Mazurek, K.; Meczynski, W.; Zieblinski, M; Crespi, F.C.L.; Bracco, A.; Benzoni, G.; Blasi, N.; Boiano, C.; Bottoni, S.; Brambilla, S.; Camera, F; Giaz, A.; Leoni, S.; Million, B.; Morales, A.I.; Nicolini, R; Pellegrini, L; Riboldi, S.; Vandone, V.; Wieland, O.; Angelis, D. De; Napoli, D.R.; Valiente-Dobon, J.J.; Bazzacco, D.; Farnea, E.; Gottardo, A.; Lenzi, S.; Lunardi, S.; Mengoni, D.; Michelagnoli, C.; Recchia, F.; Gadea, A.; Hüyük, T.; Barrientos, D; Birkenbach, B.; Geibel, K.; Hess, H.; Reiter, P; Steinbach, P; Wiens, A & Ur, C. (2014). Study of the soft dipole modes in 140Ce via inelastic scattering of 17O. Physica Scripta. ISSN 0031-8949. 89(5) . doi: 10.1088/0031-8949/89/5/054016
Larsen, Ann-Cecilie; Blasi, Nives; Bracco, Angela; Bürger, Arnold; Camera, Franco; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Goriely, Stephan; Guttormsen, Magne Sveen; Görgen, Andreas; Hagen, Trine Wiborg; Harissopulos, Sotirios; Koehler, Paul Edward; Leoni, Silvia; Million, Bénédicte; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Ruud, Inger Eli; Schiller, Andreas Ulrich; Siem, Sunniva; Tornyi, Tamas Gabor; Tveten, Gry Merete; Voinov, Alexander & Wiedeking, Mathis (2014). Low-energy enhancement of nuclear γ strength and its impact on astrophysical reaction rates. The European Physical Journal Conferences. ISSN 2101-6275. 66:07014 . doi: 10.1051/epjconf/20146607014 Full text in Research Archive.
Spyrou, A.; Liddick, S.N.; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Cooper, K.; Dombos, A.C.; Morrissey, D.J.; Naqvi, F.; Perdikakis, G.; Quinn, S.J.; Renstrøm, Therese; Rodriguez, J.A.; Simon, A.; Sumithrarachchi, C.S. & Zegers, R.G.T. (2014). Novel technique for Constraining r-Process (n, γ) Reaction Rates. Physical Review Letters. ISSN 0031-9007. 113(232502) . doi: 10.1103/PhysRevLett.113.232502 Full text in Research Archive.
Tornyi, Tamas Gabor; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Siem, Sunniva; Krasznahorkay, Attila & Csige, Lorant (2014). A new fission-fragment detector to complement the CACTUS-SiRi setup at the Oslo Cyclotron Laboratory. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 738, s 6- 12 . doi: 10.1016/j.nima.2013.12.005
Tornyi, Tamas Gabor; Guttormsen, Magne Sveen; Eriksen, Tomas Kvalheim; Görgen, Andreas; Giacoppo, Francesca; Hagen, Trine Wiborg; Krasznahorkay, A.; Larsen, Ann-Cecilie; Renstrøm, Therese; Rose, Sunniva Johanne; Siem, Sunniva & Tveten, Gry Merete (2014). Level density and gamma-ray strength function in the odd-odd 238Np nucleus. Physical Review C. Nuclear Physics. ISSN 0556-2813. 89(4) . doi: 10.1103/PhysRevC.89.044323

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Midtbø, Jørgen E.; Larsen, Ann-Cecilie & Renstrøm, Therese (2018). Extracting γ-strength functions from shell model calculations.
Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Midtbø, Jørgen E.; Crespo Campo, Lucia; Görgen, Andreas; Ingeberg, Vetle Wegner; Renstrøm, Therese; Siem, Sunniva; Tveten, Gry Merete; Zeiser, Fabio & Kirsch, Leo (2017). Gamma-widths, lifetimes and fluctuations in the nuclear quasi-continuum.
Larsen, Ann-Cecilie (2017, 30. desember). Alkymisten. Magasinet, Dagbladet.
Larsen, Ann-Cecilie (2017). Stjernestøv, supernovaer og atomkjerner – hvordan ble grunnstoffene til?.
Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Görgen, Andreas; Renstrøm, Therese; Siem, Sunniva; Tornyi, Tamas Gabor & Tveten, Gry Merete (2016). Is the generalized Brink-Axel hypothesis valid?.
Larsen, Ann-Cecilie (2016). Experimental level densities and gamma strength functions for nuclear astrophysics.
Larsen, Ann-Cecilie (2016). Novel techniques for constraining neutron-capture rates relevant to heavy-element nucleosynthesis.
Larsen, Ann-Cecilie (2016, 17. juni). Paneldeltager Abels tårn, Ekko P2. [Radio]. Realfagsbiblioteket, UiO.
Larsen, Ann-Cecilie (2016, 30. september). Programdeltagelse, Abels tårn. [Radio]. Radio, nettradio (NRK P2).
Tveten, Gry Merete; Spyrou, Artemis; Schwengner, Ronald; Naqvi, Farheen; Larsen, Ann-Cecilie; Eriksen, Tomas Kvalheim; Bello Garrote, Frank Leonel; Bernstein, Lee A.; Bleuel, Darren L.; Crespo Campo, Lucia; Guttormsen, Magne Sveen; Giacoppo, Francesca; Görgen, Andreas; Hagen, Trine Wiborg; Hadynska-Klek, Katarzyna; Klintefjord, Malin; meyer, b. s.; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva & Tornyi, Tamas Gabor (2016). The Statistical Properties Of 92Mo And Implications For The p-process. Show summary
A particularly challenging part of the question of how elements heavier than iron are created in extreme, astrophysical environments is the creation of the so-called p-nuclei, which are believed to be mainly produced in the O-Ne layer of type II supernovae or type Ia supernovae. The lack of needed nuclear data presents an obstacle in nailing down the precise site and astrophysical conditions for the production of these isotopes. Astrophysical model calculations are able to reproduce abundance patterns of most p-isotopes reasonably well, with some pivotal exceptions. In particular, p-isotopes of mass 92 ≤ A ≤ 98 are underproduced in calculations compared to the actual abundance of these isotopes. The p-isotope 92Mo represents one of the most severe cases of underproduction. State-of-the-art p-process calculations systematically underestimate the observed solar abundance of this isotope. The main destruction mechanism of this isotope in the standard description of the p-process is through the 92Mo(γ, p)91Nb reaction. Measurements on the nuclear level density and average gamma strength function of 92Mo have been carried out at the Oslo Cyclotron Laboratory. TALYS cross section and reaction rate calculations where the experimental results are used as input will be presented. The data provide stringent constraints on the 91Nb(p, γ)92Mo (and consequently the inverse) reaction rate. The reaction rate extracted in this work was used in reaction network calculations for the scenario of a p-process taking place in a type II supernova explosion as the shock front passes through the O-Ne layer of a 25 solar mass star.
Larsen, Ann-Cecilie (2015). A non-dark matter mystery: the quest for the origin of heavy elements.
Larsen, Ann-Cecilie (2015). A non-dark matter mystery: the quest for the origin of heavy elements.
Larsen, Ann-Cecilie (2015, 27. februar). Abels tårn - Ekko NRK P2. [Radio]. Realfagsbiblioteket, Vilhelm Bjerknes hus.
Larsen, Ann-Cecilie (2015). Applying for an ERC Starting Grant - some experiences and thoughts.
Larsen, Ann-Cecilie (2015). ERC Starting Grant 2015-2020: Resonant Nuclear Gamma Decay and the Heavy-Element Nucleosynthesis.
Larsen, Ann-Cecilie (2015). Enhanced low-energy gamma-decay probability – implications for r-process (n,gamma) reaction rates.
Larsen, Ann-Cecilie (2015). Galactic chemical evolution models for the Re-Os cosmochronology.
Larsen, Ann-Cecilie (2015). Heavy-element nucleosynthesis: astrophysics and nuclear-physics challenges.
Larsen, Ann-Cecilie (2015). Heavy-element nucleosynthesis: astrophysics and nuclear-physics challenges.
Larsen, Ann-Cecilie (2015). In search for the origin of heavy elements:  astrophysics and nuclear physics challenges.
Larsen, Ann-Cecilie (2015). Litt om meg, og kjernefysikk, og astrofysikk og sånn....
Larsen, Ann-Cecilie (2015). Low-energy enhancements in the nuclear gamma-decay strength - status, perspectives, and consequences for astrophysical (n,gamma) rates.
Larsen, Ann-Cecilie (2015). Min vei til et ERC Starting Grant - personlige erfaringer og tanker.
Larsen, Ann-Cecilie (2015). My ERC project and the way I got it - some personal thoughts and experiences.
Larsen, Ann-Cecilie (2015). Re/Os cosmochronology: Galactic chemical evolution model.
Larsen, Ann-Cecilie (2015). Rhenium-Osmium cosmochronology - how nuclear physics can possibly determine the age of our Galaxy.
Larsen, Ann-Cecilie (2015). Search for the upbend in neutron-rich Ge isotopes.
Larsen, Ann-Cecilie (2015). Workshop on the (beta-)Oslo method, NSCL/MSU.
Larsen, Ann-Cecilie (2015). Å søke om et ERC Starting Grant - personlige erfaringer og tanker.
Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Blasi, N; Bracco, A; Camera, F; Eriksen, Tomas Kvalheim; Görgen, Andreas; Hagen, Trine Wiborg; Leoni, Silvia; Million, B; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Ruud, Inger Eli; Siem, Sunniva; Tornyi, Tamas Gabor; Tveten, Gry Merete; Voinov, Alexander & Wiedeking, Mathis (2014). Recent results using large LaBr3 detectors and future perspectives.
Larsen, Ann-Cecilie (2014, 21. februar). Abels tårn NRK P2, 21.februar 2014. [Radio]. Radio, Abels tårn, Vilhelm Bjerknes' hus.
Larsen, Ann-Cecilie (2014). Det bittelille og det kjempestore - om atomkjerner, supernovaer, nøytronstjerner og grunnstoff-"koking".
Larsen, Ann-Cecilie (2014). Nuclear Gamma-Decay Resonances of Relevance for Astrophysics and Next-Generation Reactors.
Larsen, Ann-Cecilie (2014). Nuclear physics at OCL of importance for (n,gamma) cross sections and astrophysical reaction rates.
Larsen, Ann-Cecilie (2014). Soft structures in the average gamma-decay strength with possible implications for r-process (n,gamma) reaction rates.
Larsen, Ann-Cecilie (2014). The beta-Oslo method: experimental level density and gamma strength of neutron-rich nuclei.
Larsen, Ann-Cecilie (2014). Upbend and M1 scissors mode in neutron-rich nuclei - consequences for r-process (n,gamma) reaction rates.
Larsen, Ann-Cecilie (2014). Å søke om et ERC Starting Grant.
Tveten, Gry Merete; Campo, L.C.; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Guttormsen, Magne Sveen; Görgen, Andreas; Hagen, Trine Wiborg; Hadynska-Klek, Katarzyna; Klintefjord, Malin; Larsen, Ann-Cecilie; Maharramova, Sabina Abulfaz; Renstrøm, Therese; Rose, Sunniva Johanne; Sahin, Eda; Siem, Sunniva; Tornyi, Tamas Gabor & Bello Garrote, Frank Leonel (2014). The statistical properties of Sn-isotopes studied with the Oslo-method.

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Published Nov. 4, 2010 12:22 PM - Last modified Aug. 7, 2017 4:04 PM

Projects

Resonant Nuclear Gamma Decay and the Heavy-Element Nucleosynthesis (gResonant)

Research groups

Nuclear and Energy Physics