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Ann-Cecilie Larsen

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Norwegian version of this page
Phone +47-22855486
Mobile phone +47-95051841
Room VU69A
Available hours Anytime
Username
Visiting address SAFE Kjemibygningen Sem Sælandsvei 26 0371 Oslo
Postal address Postboks 1048 Blindern 0316 OSLO

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 82014318 (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

 

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 - , Department of Physics, University of Oslo

 

Honoraria

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

 

Cooperation

 

Senter for Akseleratorbasert Forskning og Energifysikk (SAFE), http://www.safe.uio.no

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

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

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 physics, nuclear astrophysics, detectors, Instrumentation

Publications

  • Bree, N.; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Siem, Sunniva; Tveten, Gry Merete; Hadynska-Klek, K. & et, al. (2014). Shape coexistence in the neutron-deficient even-even 182-188Hg isotopes studied via Coulomb excitation. Physical Review Letters.  ISSN 0031-9007.  112(162701)
  • 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
  • Krzysiek, M; Bürger, Alexander; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Siem, Sunniva & et., al. (2014). Study of the soft dipole modes in 140Ce via inelastic scattering of 17O. Physica Scripta.  ISSN 0031-8949.
  • 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.
  • Ducasse, Q; Jurado, B; Aiche, M; Mathieu, L; Tornyi, Tamas; Görgen, Andreas; Wilson, JN; Barreau, G.; Companis, I; Czajkowski, S; Giacoppo, Francesca; Gunsing, Frank; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Lebois, M; Matarranz, J; Renstrøm, Therese; Rose, Sunniva Johanne; Siem, Sunniva; Tsekhanovic, I; Tveten, Gry Merete; Hagen, Trine Wiborg; Wiedeking, Mathis; Serot, O; Boutoux, G; Chau, P; Meot, V & Roig, O (2013). Neutron-induced cross sections of actinides via the surrogate-reaction method. The European Physical Journal Conferences.  ISSN 2101-6275.  42 . doi: 10.1051/epjconf/20134201003
  • Guttormsen, Magne Sveen; Bernstein, Lee; Bürger, Alexander; Görgen, Andreas; Gunsing, Frank; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Renstrøm, Therese; Siem, Sunniva; Wiedeking, Mathis & Wilson, Jonathan (2013). Observation of large orbital scissors strength in actinides. Acta Physica Polonica B.  ISSN 0587-4254.  44(3), s 567- 570 . doi: 10.5506/APhysPolB.44.567
  • Guttormsen, Magne Sveen; Jurado, Beatriz; Wilson, J. N.; Aiche, M; Bernstein, L. A.; Ducasse, Quentin; Giacoppo, Francesca; Görgen, Andreas; Gunsing, Frank; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Lebois, M; Leniau, Baptist; Renstrøm, Therese; Rose, Sunniva Johanne; Siem, Sunniva; Tornyi, Tamas Gabor; Tveten, Gry Merete & Wiedeking, Mathis (2013). Constant-temperature level densities in the quasicontinuum of Th and U isotopes. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  88(2) . doi: 10.1103/PhysRevC.88.024307
  • Koehler, Paul Edward; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Siem, Sunniva & Guber, K. H. (2013). Extreme nonstatistical effects in γ decay of 95Mo neutron resonances. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  88(4) . doi: 10.1103/PhysRevC.88.041305
  • Larsen, Ann-Cecilie; Blasi, Nives; Bracco, Angela; Camera, Franco; Eriksen, Tomas Kvalheim; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Leoni, Silvia; 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 (2013). Evidence for the dipole nature of the low-energy γ enhancement in 56Fe. Physical Review Letters.  ISSN 0031-9007.  111(24) . doi: 10.1103/PhysRevLett.111.242504
  • Larsen, Ann-Cecilie; Bürger, Alexander; Goriely, Stephane; Guttormsen, Magne Sveen; Görgen, Andreas; Eriksen, Tomas Kvalheim; Hagen, Trine Wiborg; Harrisopulos, Sotirios; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Schiller, Andreas Ulrich; Siem, Sunniva; Tveten, Gry Merete; Voinov, Alexander & Ruud, Inger Eli (2013). Astrophysical reaction rates and the low-energy enhancement in the γ strength. Acta Physica Polonica B.  ISSN 0587-4254.  44(3), s 563- 566 . doi: 10.5506/APhysPolB.44.563
  • Larsen, Ann-Cecilie; Bürger, Alexander; Goriely, Stephane; Guttormsen, Magne Sveen; Görgen, Andreas; Hagen, Trine Wiborg; Harrisopulos, Sotirios; Nyhus, Hilde-Therese; Renstrøm, Therese; Schiller, Andreas Ulrich; Siem, Sunniva; Tveten, Gry Merete; Voinov, Alexander; Wiedeking, Mathis & Ruud, Inger Eli (2013). Transitional γ strength in Cd isotopes. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  87(1) . doi: 10.1103/PhysRevC.87.014319
  • Schwengner, Ronald; Frauendorf, Stefan & Larsen, Ann-Cecilie (2013). Low-Energy Enhancement of Magnetic Dipole Radiation. Physical Review Letters.  ISSN 0031-9007.  111(23) . doi: 10.1103/PhysRevLett.111.232504
  • Utsunomiya, H.; Goriely, Stephane; Kondo, T.; Iwamoto, C.; Akimune, H.; Yamagata, T.; Toyokawa, H.; Harada, H.; Kitatani, F.; Lui, Y.-W.; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Koehler, Paul Edward; Hilaire, Stephane; Péru, S.; Martini, M. & Koning, A. J. (2013). Photoneutron cross sections for Mo isotopes: A step toward a unified understanding of (gamma,n) and (n,gamma) reactions. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  88(1) . doi: 10.1103/PhysRevC.88.015805
  • Voinov, Alexander; Grimes, S.M.; Brune, C.R.; Bürger, Alexander; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Massey, T.N. & Siem, Sunniva (2013). Experimental differential cross sections, level densities, and spin cutoffs as a testing ground for nuclear reaction codes. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  88(5) . doi: 10.1103/PhysRevC.88.054607
  • Bürger, Alexander; Larsen, Ann-Cecilie; Hilaire, Stephane; Guttormsen, Magne Sveen; Harrisopulos, Sotirios; Kmiecik, Maria; Konstantinopoulos, T; Krticka, Milan; Lagoyannis, Anastasios; Lönnroth, Tom; Mazurek, Katarzyna; Norrby, Markus; Nyhus, Hilde-Therese; Perdikakis, George; Siem, Sunniva; Spyrou, Artemis & Syed, Naeem Ul Hasan (2012). Nuclear level density and γ-ray strength function of 43Sc. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  85(6) . doi: 10.1103/PhysRevC.85.064328
  • Guttormsen, Magne Sveen; Bernstein, Lee; Bürger, Alexander; Görgen, Andreas; Gunsing, Frank; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Renstrøm, Therese; Siem, Sunniva; Wiedeking, Mathis & Wilson, Jonathan (2012). Observation of Large Scissors Resonance Strength in Actinides. Physical Review Letters.  ISSN 0031-9007.  109(16) . doi: 10.1103/PhysRevLett.109.162503
  • Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bürger, Alexander; Görgen, Andreas; Nyhus, Hilde-Therese; Siem, Sunniva; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete; Harissopulos, Sotirios; Konstantinopoulos, Theodor; Lagoyannis, Anastasios; Perdikakis, George; Spyrou, Artemis; Kmiecik, Maria; Mazurek, Katarzyna; Krticka, Milan; Lönnroth, Tom; Norrby, Markus; Schiller, Andreas & Voinov, Alexander (2012). Do light nuclei display a universal gamma-ray strength function?. Europhysics letters.  ISSN 0295-5075.  21:04004 . doi: 10.1051/epjconf/20122104004
  • Larsen, Ann-Cecilie; Goriely, Stephane; Bürger, Alexander; Guttormsen, Magne Sveen; Görgen, Andreas; Harrisopulos, Sotirios; Kmiecik, Marysia; Konstantinopoulos, T; Lagoyannis, Anastasios; Lönnroth, Tom; Mazurek, Katarzyna; Norrby, Markus; Nyhus, Hilde-Therese; Perdikakis, George; Schiller, Andreas; Siem, Sunniva; Spyrou, Artemis; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete & Voinov, Alexander (2012). Primary gamma-ray spectra in Ti-44 of astrophysical interest. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  85(1) . doi: 10.1103/PhysRevC.85.014320
  • Nyhus, Hilde-Therese; Siem, Sunniva; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bürger, Alexander; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete & Voinov, A (2012). Level density and thermodynamic properties of dysprosium isotopes. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  85(1) . doi: 10.1103/PhysRevC.85.014323
  • Wilson, J.N.; Gunsing, F.; Bernstein, L.A.; Bürger, Alexander; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Mansouri Samani, Pejman; Renstrøm, Therese; Rose, Sunniva Johanne; Semchenkov, Andrey; Siem, Sunniva; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Wiedeking, M. & Hagen, Trine Wiborg (2012). Indirect (n, gamma) cross sections of thorium cycle nuclei using the surrogate method. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  85(3) . doi: 10.1103/PhysRevC.85.034607
  • Wilson, J.N.; Gunsing, Frank; Bernstein, Lee; Bürger, Alexander; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Mansouri, Pejman; Renstrøm, Therese; Rose, Sunniva Johanne; Siem, Sunniva; Wiedeking, Mathis & Hagen, Trine Wiborg (2012). Level Densities in the actinide region and indirect (n,gamma) cross section measurements using the surrogate method. The European Physical Journal Conferences.  ISSN 2101-6275.  21
  • Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bürger, Alexander; Görgen, Andreas; Harissopulos, Sotirios; Kmiecik, Maria; Konstantinopoulos, Theodor; Krticka, Milan; Lagoyannis, Anastasios; Lönnroth, Tom; Mazurek, Katarzyna; Norrby, Martin; Nyhus, Hilde-Therese; Perdikakis, George; Schiller, Andreas; Siem, Sunniva; Spyrou, Artemis; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete & Voinov, Alexander (2011). Fermi’s golden rule applied to the γ decay in the quasicontinuum of 46Ti. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  83(014312) . doi: 10.1103/PhysRevC.83.014312
  • Hagen, Trine Wiborg; Lopez-Martens, A.; Hauschild, K; Belozerov, A. V.; Chelnokov, M. L.; Chepigin, V. I.; Curien, D.; Dorvaux, O.; Drafta, G; Gall, B.; Görgen, Andreas; Guttormsen, Magne Sveen; Isaev, A.V.; Izosimov, I.N.; Kabachenko, A. P.; Katrasev, D.E.; Kutsarova, T.; Kuznetsov, Andrej; Larsen, Ann-Cecilie; Malyshev, O. N.; Minkova, A.; Mullins, S.; Nyhus, Hilde-Therese; Pantelica, D.; Piot, J.; Popeko, A. G.; Saro, S.; Scintee, N.; Siem, Sunniva; Sokol, E. A.; Svirikhin, A. I. & Yeremin, A. V. (2011). SPECTROSCOPY OF TRANSFERMIUM NUCLEI USING THE GABRIELA SETUP. Acta Physica Polonica B.  ISSN 0587-4254.  42(3-4), s 605- 608 . doi: 10.5506/APhysPolB.42.605
  • Larsen, Ann-Cecilie; Goriely, Stephane; Algin, Emel; Agvaanluvsan, Undraa; Bürger, Annetta; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Lönnroth, Tom; Mitchell, Gary E.; Nyhus, Hilde-Therese; Rekstad, John Bernhard; Renstrøm, Therese; Rose, Sunniva Johanne; Ruud, Inger Eli; Schiller, Andreas; Siem, Sunniva; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete; Voinov, Alexander & Wikan, Kristine (2011). Gamma-ray strength functions and their relation to astrophysics. AIP Conference Proceedings.  ISSN 0094-243X.  1377, s 239- 246 . doi: 10.1063/1.3628386
  • Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Krticka, Milan; Betak, Emil; Bürger, Alexander; Görgen, Andreas; Nyhus, Hilde-Therese; Rekstad, John Bernhard; Schiller, Andreas; Siem, Sunniva; Toft, Heidi Kristine; Tveten, Gry Merete; Voinov, Alexander & Wikan, Kristine (2011). Analysis of possible systematic errors in the Oslo method. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  83 . doi: 10.1103/PhysRevC.83.034315
  • Lönnroth, Tom; Källman, K-M; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie & Manngård, P (2011). Study of the high-lying, high-spin alpha+Si-28 resonance structure in S-32. Journal of Physics G: Nuclear and Particle Physics.  ISSN 0954-3899.  38(3) . doi: 10.1088/0954-3899/38/3/035107
  • Lopez-Martens, A.; Wiborg-Hagen, T.; Hauschild, K; Chelnokov, M. L.; Chepigin, V. I.; Curien, D.; Dorvaux, O.; Drafta, G; Gall, B.; Görgen, Andreas; Guttormsen, M; Isaev, A.V.; Izosimov, I.N.; Kabachenko, A.P.; Katrasev, D.E.; Kutsarova, T.; Kuznetsov, A.N.; Larsen, Ann-Cecilie; Malyshev, O. N.; Minkova, A.; Mullins, S.; Nyhus, Hilde-Therese; Pantelica, D.; Piot, J.; Popeko, A. G.; Saro, S.; Scintee, N.; Siem, Sunniva; Syed, Naeem Ul Hasan; Sokol, E. A.; Svirikhin, A.I. & Yeremin, A. V. (2011). Spectroscopy of No-253 and its daughters. Nuclear Physics A.  ISSN 0375-9474.  852(1), s 15- 35 . doi: 10.1016/j.nuclphysa.2011.01.012
  • Scheck, Marcus; Butler, PA; Gaffney, LP; Bree, N; Carrol, RJ; Cox, D; Grahn, T; Greenlees, PT; Hauschild, K; Herzan, A; Huyse, M; Jakobsson, U; Jones, P; Joss, DT; Julin, R; Juutinen, S; Ketelhut, S; Herzberg, RD; Kowalczyk, M; Larsen, Ann-Cecilie; Leino, M; Lopez-Martens, A; Nieminen, P; Page, RD; Pakarinen, J; Papadakis, P; Peura, P; Rahkila, P; Rinta-Antila, S; Ruotsalainen, P; Sandzelius, M; Saren, J; Scholey, C; Sorri, J; Srebrny, J; Van Duppen, P; Watkins, HV & Uusitalo, J (2011). Combined in-beam electron and gamma-ray spectroscopy of Hg-184,Hg-186. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  83(3) . doi: 10.1103/PhysRevC.83.037303
  • Toft, Heidi Kristine; Larsen, Ann-Cecilie; Bürger, Alexander; Guttormsen, Magne Sveen; Görgen, Andreas; Nyhus, Hilde-Therese; Renstrøm, Therese; Siem, Sunniva; Tveten, Gry Merete & Voinov, Alexander (2011). Evolution of the pygmy dipole resonance in Sn isotopes. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  83(4) . doi: 10.1103/PhysRevC.83.044320
  • Voinov, Alexander; Grimes, S.M.; Brune, C.R.; Bürger, Alexander; Görgen, Andreas; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Massey, T.N.; Siem, Sunniva & Kalbach, C (2011). Equilibrium and pre-equilibrium processes in the Mn-55(Li-6,xp) and Fe-57(alpha,xp) reactions. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  83(5), s 054605 . doi: 10.1103/PhysRevC.83.054605
  • Hauschild, Karl; Lopez-martens, A.; Hagen, Trine Wiborg; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Siem, Sunniva; Syed, Naeem Ul Hasan; Görgen, Andreas & et al., , (2010). Spectroscopy of transfermium nuclei using the GABRIELA set up at the focal plane of the VASSILISSA recoil separator. AIP Conference Proceedings.  ISSN 0094-243X.  1224, s 269- 278 . doi: 10.1063/1.3431424
  • Larsen, Ann-Cecilie; Agvaanluvsan, Undraa; Bernstein, L. A.; Bürger, Alexander; Chankova, Rosita; Goriely, S; Guttormsen, Magne Sveen; Lönnroth, T.; Mitchell, GE; Nyhus, Hilde-Therese; Schiller, A.; Siem, Sunniva; Syed, Naeem Ul Hasan; Toft, Heidi Kristine & Voinov, A. (2010). Soft structures of γ-ray strength functions studied with the Oslo method. PoS - Proceedings of Science.  ISSN 1824-8039.  2(03001) . doi: 10.1051/epjconf/20100203001
  • Larsen, Ann-Cecilie & Goriely, S (2010). Impact of a low-energy enhancement in the gamma-ray strength function on the neutron-capture cross section. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  82(1) . doi: 10.1103/PhysRevC.82.014318
  • Nyhus, Hilde-Therese; Siem, Sunniva; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bürger, Alexander; Syed, Naeem Ul Hasan; Tveten, Gry Merete & Voinov, Alexander (2010). Radiative strength functions in Dy-163,Dy-164. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  81(2) . doi: 10.1103/PhysRevC.81.024325
  • Toft, Heidi Kristine; Larsen, Ann-Cecilie; Agvaanluvsan, Undraa; Bürger, Alexander; Guttormsen, Magne Sveen; Mitchell, Gary; Nyhus, Hilde-Therese; Schiller, Andreas; Siem, Sunniva; Syed, Naeem Ul Hasan & Voinov, Alexander (2010). Level densities and gamma-ray strength functions in Sn isotopes. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  c81(064311)
  • Voinov, A; Grimes, SM; Brune, CR; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Massey, TN; Schiller, A & Siem, Sunniva (2010). gamma-strength functions in Ni-60 from two-step cascades following proton capture. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  81(2) . doi: 10.1103/PhysRevC.81.024319
  • Agvaanluvsan, U; Larsen, Ann-Cecilie; Chankova, R; Guttormsen, Magne Sveen; Mitchell, GE; Schiller, A; Siem, Sunniva & Voinov, A (2009). Enhanced Radiative Strength in the Quasicontinuum of Sn-117. Physical Review Letters.  ISSN 0031-9007.  102(16) . doi: 10.1103/PhysRevLett.102.162504
  • Agvaanluvsan, Undraa; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Chankova, Rositsa; Mitchell, Gary E.; Schiller, Andreas; Siem, Sunniva & Voinov, Alexander (2009). Evidence for the pair-breaking process in 116,117Sn. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  79(1) . doi: 10.1103/PhysRevC.79.014320
  • Nyhus, Hilde-Therese; Siem, Sunniva; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bürger, Alexander; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete & Voinov, Alexander (2009). Level Densities, Thermodynamics and Gamma-ray Strength Functions in 163,164Dy. Acta Physica Polonica B.  ISSN 0587-4254.  40(3), s 593- 596
  • Schiller, Andreas; Agvaanluvsan, Undraa; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen & Siem, Sunniva (2009). Level density and radiative strength of 116,117Sn. AIP Conference Proceedings.  ISSN 0094-243X. . doi: 2009APS..HAW.DG010S
  • Siem, Sunniva; Agvaanluvsan, Undraa; Bürger, Alexander; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Rekstad, John Bernhard; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete & et al., , (2009). Level densities and radiative strength functions. AIP Conference Proceedings.  ISSN 0094-243X.  1090, s 66- 73 . doi: 10.1063/1.3087125
  • Syed, Naeem Ul Hasan; Guttormsen, Magne Sveen; Ingebretsen, Finn; Larsen, Ann-Cecilie; Lonnroth, T; Rekstad, John Bernhard; Schiller, A; Siem, Sunniva & Voinov, A (2009). Level density and gamma-decay properties of closed shell Pb nuclei. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  79(2) . doi: 10.1103/PhysRevC.79.024316
  • Syed, Naeem Ul Hasan; Larsen, Ann-Cecilie; Bürger, Alexander; Guttormsen, Magne Sveen; Harissopulos, S; Kmiecik, M; Konstantinopoulos, T; Krticka, M; Lagoyannis, A; Lonnroth, T; Mazurek, K; Norby, M; Nyhus, Hilde-Therese; Perdikakis, G; Siem, Sunniva & Spyrou, Artemis (2009). Extraction of thermal and electromagnetic properties in Ti-45. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  80(4) . doi: 10.1103/PhysRevC.80.044309
  • Voinov, AV; Oginni, BM; Grimes, SM; Brune, CR; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Massey, TN; Schiller, A & Siem, Sunniva (2009). Nuclear excitations at constant temperature. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  79(3) . doi: 10.1103/PhysRevC.79.031301
  • Algin, Emel; Agvaanluvsan, Undraa; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Mitchell, Gary; Rekstad, John Bernhard; Schiller, Andreas; Siem, Sunniva & Voinov, Alexander (2008). Thermodynamic properties of 56,57Fe. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  C78(054321)
  • Dorvaux, Olivier; Lopez-Martens, Araceli; Hauschild, Karl; Yeremin, A. V.; Khouaja, A.; Belozerov, A. V.; Briancon, Ch.; Chelnokov, M. L.; Chepigin, V. I.; Curien, D.; Désesquelles, P.; Gall, B.; Gorshkov, V. A.; Guttormsen, Magne Sveen; Hanappe, F.; Kabachenko, A. P.; Khalfallah, F.; Korichi, Amel; Larsen, Ann-Cecilie; Malyshev, O. N.; Minkova, A.; Oganessian, Yu. Ts.; Popeko, A. G.; Rousseau, M.; Rowley, N.; Sagaidak, R. N.; Sharo, S.; Shutov, A. V.; Siem, Sunniva; Stuttgé, V. I. L.; Svirikhin, A. I.; Syed, Naeem Ul Hasan & Theisen, Christophe (2008). Spectroscopy of heavy elements at Dubna. AIP Conference Proceedings.  ISSN 0094-243X.  1012, s 64- 68
  • Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Rekstad, John Bernhard; Schiller, Andreas; Siem, Sunniva; Syed, Naeem Ul Hasan & Voinov, Alexander (2008). Thermodynamic properties of atomic nuclei with T<1 MeV. AIP Conference Proceedings.  ISSN 0094-243X.  1012, s 198- 202
  • Hauschild, Karl; Lopez-Martens, Araceli; Yeremin, A. V.; Dorvaux, Olivier; Belozerov, A. V.; Chelnokov, M. L.; Chepigin, V. I.; Gall, B.; Gorshkov, V. A.; Guttormsen, Magne Sveen; Jones, P.; Kabachenko, A. P.; Khouaja, A.; Larsen, Ann-Cecilie; Malyshev, O. N.; Minkova, A.; Oganessian, Yu. Ts.; Pantelica, D.; Popeko, A. G.; Rotaru, F.; Saro, S.; Shutov, A. V.; Siem, Sunniva; Svirikhin, A. I.; Syed, Naeem Ul Hasan & Nyhus, Hilde-Therese (2008). Half-life and excitation energy of the I^{\pi}=13/2+ isomer in 209Ra. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  77 . doi: 10.1103/PhysRevC.77.047305
  • Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Chankova, Rositsa; Ingebretsen, Finn; Lönnroth, Tom; Rekstad, John Bernhard; Schiller, Andreas; Siem, Sunniva; Syed, Naeem Ul Hasan; Voinov, Alexander & Messelt, Svein (2008). Experimental nuclear level densities and gamma-ray strength functions in Sc and V isotopes. AIP Conference Proceedings.  ISSN 0094-243X.  1005, s 70- 73
  • Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Chankova, Rositsa; Ingebretsen, Finn; Lönnroth, Tom; Rekstad, John Bernhard; Schiller, Andreas; Siem, Sunniva; Syed, Naeem Ul Hasan; Voinov, Alexander & Messelt, Svein (2008). Puzzling gamma-ray strength functions in 44,45Sc and 50,51V. AIP Conference Proceedings.  ISSN 0094-243X.  s 380- 382
  • Siem, Sunniva; Guttormsen, Magne Sveen; Chankova, Rositsa; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Rekstad, John Bernhard; Syed, Naeem Ul Hasan; Schiller, Andreas; Voinov, Alexander & Ødegård, Stein Westad (2008). Level densities and gamma-strength functions in Sm isotopes. AIP Conference Proceedings.  ISSN 0094-243X.  s 425- 427
  • Siem, Sunniva; Guttormsen, Magne Sveen; Chankova, Rositsa; Larsen, Ann-Cecilie; Rekstad, John Bernhard; Syed, Naeem Ul Hasan; Schiller, Andreas; Voinov, Alexander; Ødegård, Stein Westad; Nyhus, Hilde-Therese; Messelt, Svein & Ingebretsen, Finn (2008). Experimental Level densities and gamma-strength functions in rare earth nuclei. AIP Conference Proceedings.  ISSN 0094-243X.  1005
  • Syed, Naeem Ul Hasan; Guttormsen, Magne Sveen; Ingebretsen, Finn; Larsen, Ann-Cecilie; Siem, Sunniva; Lönnroth, Tom; Schiller, Andreas & Voinov, Alexander (2008). The Oslo Method and Its Application to Lead Isotopes. AIP Conference Proceedings.  ISSN 0094-243X.  s 428- 430
  • Voinov, Alexander; Grimes, S.M.; Larsen, Ann-Cecilie; Brune, C.R.; Guttormsen, Magne Sveen; Massey, T.N.; Schiller, Andreas; Siem, Sunniva & Syed, Naeem Ul Hasan (2008). Level densities of 44Sc and 47Ti from different experimental techniques. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  77(034613) . doi: 10.1103/PhysRevC.77.034613
  • Hurst, AM; Butler, PA; Jenkins, DG; Delahaye, P; Wenander, F; Ames, F; Barton, CJ; Behrens, T; Burger, A; Cederkall, J; Clement, E; Czosnyka, T; Davinson, T; de Angelis, G; Eberth, J; Ekstrom, A; Franchoo, S; Georgiev, G; Gorgen, A; Herzberg, RD; Huyse, M; Ivanov, O; Iwanicki, J; Jones, GD; Kent, P; Koster, U; Kroll, T; Krucken, R; Larsen, Ann-Cecilie; Nespolo, M; Pantea, M; Paul, ES; Petri, M; Scheit, H; Sieber, T; Siem, Sunniva; Smith, JF; Steer, A; Stefanescu, I; Syed, Naeem Ul Hasan; de Walle, JV; Van Duppen, P; Wadsworth, R; Warr, N; Weisshaar, D & Zielinska, M (2007). Measurement of the sign of the spectroscopic quadrupole moment for the 2(1)(+) state in Se-70: No evidence for oblate shape. Physical Review Letters.  ISSN 0031-9007.  98 . doi: 10.1103/PhysRevLett.98.072501
  • Guttormsen, Magne; Chankova, Rosita; Larsen, Ann-Cecilie; Rekstad, John Bernhard; Siem, Sunniva; Syed, Naeem Ul Hasan; Agvaanluvsan, Undraa; Schiller, Andreas & Voinov, Alexander (2007). The role of broken cooper pairs in warm nuclei. Acta Physica Polonica B.  ISSN 0587-4254.  38(4), s 1489- 1493
  • Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Chankova, Rositsa; Ingebretsen, Finn; Lönnroth, Tom; Messelt, Svein; Rekstad, John Bernhard; Schiller, Andreas; Siem, Sunniva; Syed, Naeem Ul Hasan & Voinov, Alexander (2007). Nuclear level densities and gamma-ray strength functions in Sc-44,Sc-45. Physical Review C. Nuclear Physics.  ISSN 0556-2813.  (76) . doi: 10.1103/PhysRevC.76.044303

View all works in Cristin

  • 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). Nuclear physics at OCL of importance for (n,gamma( cross sections and astrophysical reaction rates.
  • 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.
  • Guttormsen, Magne Sveen; Bernstein, Lee; Bürger, Alexander; Görgen, Andreas; Gunsing, Frank; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Renstrøm, Therese; Siem, Sunniva; Wiedeking, Mathis & Wilson, Jonathan (2013). Scissors strength in the quasi-continuum of actinides .
  • Larsen, Ann-Cecilie (2013). Low-energy enhancement of nuclear gamma strength and its impact on astrophysical reaction rates.
  • Larsen, Ann-Cecilie (2013). Measurements of level densities and gamma-ray strength functions.
  • Larsen, Ann-Cecilie (2013). Neutron-capture cross section calculations based on measured level densities and gamma-strength functions.
  • Larsen, Ann-Cecilie (2013). Nuclear gamma-ray strength function and (n,gamma) reaction rates.
  • Larsen, Ann-Cecilie (2013). The Oslo Method - Part 2.
  • Larsen, Ann-Cecilie (2013). The Oslo Method, Part 1.
  • Görgen, Andreas; Klintefjord, Malin Linnea; Siem, Sunniva; Giacoppo, Francesca; Hoff, Per; Korten, Wolfram; Larsen, Ann-Cecilie; Rapisarda, E; Renstrøm, Therese; Siebeck, B.; Thoele, P; Tornyi, Tamas; Tveten, Gry Merete & Zielinska, Magdalena (2012). Shape transition and coexistence in neutron-deficient rare earth nuclei: Coulomb excitation of 140Sm.
  • Guttormsen, Magne Sveen; Bernstein, Lee; Bürger, Alexander; Görgen, Andreas; Gunsing, Frank; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Renstrøm, Therese; Siem, Sunniva; Wiedeking, Mathis & Wilson, Jonathan (2012). Observation of large orbital scissors strength in actinides.
  • Larsen, Ann-Cecilie (2012). The low-energy enhancement in the gamma-ray strength function.
  • Larsen, Ann-Cecilie; Bürger, Alexander; Goriely, Stephane; Guttormsen, Magne Sveen; Görgen, Andreas; Harrisopulos, Sotirios; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Schiller, Andreas Ulrich; Siem, Sunniva; Tveten, Gry Merete & Voinov, Alexander (2012). Astrophysical reaction rates and the low-energy enhancement in the γ-ray strength.
  • Larsen, Ann-Cecilie; Bürger, Alexander; Goriely, Stephane; Guttormsen, Magne Sveen; Görgen, Andreas; Harrisopulos, Sotirios; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Schiller, Andreas Ulrich; Siem, Sunniva; Tveten, Gry Merete & Voinov, Alexander (2012). LOW-ENERGY ENHANCEMENT IN THE γ STRENGTH WITH IMPACT ON ASTROPHYSICAL REACTION RATES.
  • Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bürger, Alexander; Görgen, Andreas; Nyhus, Hilde-Therese; Siem, Sunniva; Syed, Naeem Ul Hasan; Toft, Heidi Kristine & Tveten, Gry Merete (2011). Do light nuclei display a universal gamma-ray strength function?.
  • Larsen, Ann-Cecilie; Bürger, Alexander; Eriksen, Tomas Kvalheim; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Nyhus, Hilde-Therese; Rekstad, John Bernhard; Renstrøm, Therese; Rose, Sunniva Johanne; Ruud, Inger Eli; Siem, Sunniva; Tveten, Gry Merete; Goriely, Stephane; Harrisopulos, Sotirios; Schiller, Andreas; Voinov, Alexander; Wilson, Jonathan; Leniau, Baptist; Gunsing, Frank; Krticka, Milan; Betak, Emil; Bernstein, Lee; Bleuel, Darren L.; Wiedeking, Mathis; Agvaanluvsan, Undraa; Mitchell, Gary E.; Algin, Emel & Lönnroth, Tom (2011). Experiments of reaction model inputs: level density and gamma strength.
  • Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Bürger, Alexander; Eriksen, Tomas Kvalheim; Görgen, Andreas; Hagen, Trine Wiborg; Nyhus, Hilde-Therese; Rekstad, John Bernhard; Renstrøm, Therese; Rose, Sunniva Johanne; Ruud, Inger Eli; Siem, Sunniva; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete & Wikan, Kristine (2011). Level density and gamma strength - achievements and challenges.
  • Bürger, Alexander; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Mansouri, Pejman; Miah, Md.M.H.; Nyhus, Hilde-Therese; Renstrøm, Therese; Rose, Sunniva Johanne; Siem, Sunniva; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Voinov, Alexander & Wikan, Kristine (2010). Level Densities and Gamma-Ray Strength Functions in Zr Isotopes.
  • Bürger, Alexander; Larsen, Ann-Cecilie; Syed, Naeem Ul Hasan; Guttormsen, Magne Sveen; Nyhus, Hilde-Therese; Siem, Sunniva & et al., , (2010). Level Densities and γ Strength Functions in Light Sc and Ti Isotopes. PoS - Proceedings of Science.  ISSN 1824-8039.  (03002) . doi: 10.1051/epjconf/20100203003
  • Larsen, Ann-Cecilie (2010). Gamma-ray strength functions and their relation to astrophysics.
  • Larsen, Ann-Cecilie (2010). Structures in the radiative strength function relevant for astrophysics.
  • Bürger, Alexander; Larsen, Ann-Cecilie; Syed, Naeem Ul Hasan; Guttormsen, Magne Sveen; Harissopulos, Sotirios; Kmiecik, Marysia; Konstantinopoulos, Theo; Krticka, Milan; Lagoyannis, A.; Lönnroth, Tom; Mazurek, K.; Norby, M.; Nyhus, Hilde-Therese; Perdikakis, George; Siem, Sunniva & Spyrou, Artemis (2009). Level density and gamma-ray strength function in 43Sc.
  • Bürger, Alexander; Larsen, Ann-Cecilie; Syed, Naeem Ul Hasan; Guttormsen, Magne Sveen; Nyhus, Hilde-Therese; Siem, Sunniva; Harissopulos, Sotirios; Konstantinopoulos, Theo; Lagoyannis, A.; Perdikakis, George; Spyrou, Artemis; Kmiecik, Marysia; Mazurek, K.; Krticka, Milan; Lönnroth, Tom & Norby, M. (2009). Level Densities and Gamma Strength Functions in Light Sc and Ti Isotopes .
  • Bürger, Alexander; Syed, Naeem Ul Hasan; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Harissopulos, Sotirios; Kmiecik, M.; Konstantinopoulos, Theo; Krticka, Milan; Lagoyannis, A.; Lönnroth, Tom; Mazurek, K.; Norby, M.; Nyhus, Hilde-Therese; Perdikakis, George; Siem, Sunniva & Spyrou, Artemis (2009). Level Densities and Strength Functions in Light Sc and Ti Isotopes.
  • Larsen, Ann-Cecilie (2009). Soft structures of gamma-ray strength functions studied with the Oslo method.
  • Nyhus, Hilde-Therese; Siem, Sunniva; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Syed, Naeem Ul Hasan & Voinov, Alexander (2009). Level densities and the gamma ray strength functions of 163;164Dy.
  • Toft, Heidi Kristine; Bürger, Alexander; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Siem, Sunniva; Syed, Naeem Ul Hasan & Tveten, Gry Merete (2009). Level Densities and Gamma Strength Functions in 116,118,118Sn.
  • Toft, Heidi Kristine; Bürger, Alexander; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Nyhus, Hilde-Therese; Siem, Sunniva; Syed, Naeem Ul Hasan & Tveten, Gry Merete (2009). Level Densities and Gamma Strength Functions in 116,118,119Sn.
  • Andersen, Pål A Flodin & Larsen, Ann-Cecilie (2008, 29. juli). Atomkjernen - rødere enn ventet. [Internett].  http://www.forskning.no/artikler/2008/juli/188628.
  • Larsen, Ann-Cecilie (2008). Gamma-ray strength functions obtained with the Oslo method.
  • Larsen, Ann-Cecilie (2008). Nuclear structure with astrophysical impact - gamma-ray strength functions and pygmy resonances.
  • Larsen, Ann-Cecilie (2008). Statistical properties in the quasi-continuum of atomic nuclei.
  • Nyhus, Hilde-Therese; Siem, Sunniva; Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Bürger, Alexander; Syed, Naeem Ul Hasan; Toft, Heidi Kristine; Tveten, Gry Merete & Voinov, Alexander (2008). Level Densities, Thermodynamics and Gamma-ray Strength Functions in 163,164Dy.
  • Pajchel, Katarina; Samset, Bjørn Hallvard; Pedersen, Maiken; Gramstad, Eirik; Lynnebakken, Hilde; Henriksen, Ellen Karoline; Gjelsten, Børge Kile; Smestad, Lillian; Sjøbæk, Kyrre Ness; Bugge, Magnar Kopangen; Larsen, Ann-Cecilie; Read, Alexander Lincoln & Ould-Saada, Farid (2008). Hva er du laget av? Forskningstorget 2008, institutt bod.
  • Larsen, Ann-Cecilie (2007). Experimental level densities and gamma-ray strength functions in the f7/2 nuclei 44,45Sc and 50,51V.
  • Larsen, Ann-Cecilie (2007). Experimental level densities and gamma-ray strength functions of 44,45Sc and 50,51V.
  • Larsen, Ann-Cecilie (2007). Experimental nuclear level densities and gamma-ray strength functions in Sc and V isotopes.
  • Larsen, Ann-Cecilie (2007). Gamma-ray strength functions in the f7/2 shell nuclei 44,45Sc and 50,51V.
  • Larsen, Ann-Cecilie (2007). Hvordan kan kjernefysikk redde liv? Medisinsk bruk av kunnskap om atomkjernen.
  • Larsen, Ann-Cecilie; Chankova, Rositsa; Guttormsen, Magne Sveen; Ingebretsen, Finn; Lönnroth, Tom; Messelt, Svein; Rekstad, John Bernhard; Schiller, Andreas; Siem, Sunniva; Syed, Naeem Ul Hasan & Voinov, Alexander (2007). Puzzling gamma-ray strength functions in 44,45Sc and 50,51V.

View all works in Cristin

Published Nov 4, 2010 12:22 PM - Last modified Mar 17, 2014 11:26 AM