Tomas Kvalheim Eriksen

• Kibédi, T.; Alshahrani, B.; Stuchbery, A.E.; Larsen, Ann-Cecilie; Görgen, Andreas; Siem, Sunniva; Guttormsen, Magne Sveen; Giacoppo, Francesca; Morales, A.I.; Sahin, Eda; Tveten, Gry Merete; Bello Garrote, Frank Leonel; Crespo Campo, Lucia; Eriksen, Tomas Kvalheim; Klintefjord, Malin; Maharramova, Sabina; Nyhus, Hilde-Therese; Tornyi, Tamas Gabor; Renstrøm, Therese & Paulsen, Wanja (2020). Radiative Width of the Hoyle State from γ -Ray Spectroscopy. Physical Review Letters.  ISSN 0031-9007.  125(18) . doi: 10.1103/PhysRevLett.125.182701
• Evitts, Lee J.; Garnsworthy, Adam B.; Kibédi, Tibor; Smallcombe, James; Reed, Matthew W.; Stuchbery, Andrew E.; Lane, Gregory J.; Eriksen, Tomas Kvalheim; Akber, Aqeel; Alshahrani, B.; De Vries, Mitchell; Gerathy, Matthew S.M.; Holt, Jason D.; Lee, Boon Quan; McCormick, Brendan P.; Mitchell, Alan J.; Moukaddam, Mohamad; Mukhopadhyay, Sharmistha; Palalani, Nyaladzi; Palazzo, Thomas; Peters, Erin E.; Ramirez, Anthony Paul D.; Tornyi, Tamas Gabor & Yates, Steven W. (2019). E0 transition strength in stable Ni isotopes. Physical Review C.  ISSN 2469-9985.  99:024306(2), s 1- 11 . doi: 10.1103/PhysRevC.99.024306
• McCormick, Brendan P.; Stuchbery, A.E.; Brown, BA; Georgiev, G; Coombes, BJ; Gray, TJ; Gerathy, MSM; Lane, GJ; Kibedi, T; Mitchell, AJ; Reed, MW; Akber, A; Bignell, LJ; Dowie, JTH; Eriksen, Tomas Kvalheim; Hota, S; Palalani, N & Tornyi, Tamas Gabor (2019). First-excited state g factors in the stable, even Ge and Se isotopes. Physical Review C.  ISSN 2469-9985.  100(4) . doi: 10.1103/PhysRevC.100.044317 Fulltekst i vitenarkiv.
• Zeiser, Fabio; Tveten, Gry Merete; Potel, Gregory; Larsen, Ann-Cecilie; Guttormsen, Magne Sveen; Laplace, Thibault A.; Siem, Sunniva; Bleuel, Darren L.; Goldblum, Bethany L.; Bernstein, Lee A.; Bello Garrote, Frank Leonel; Crespo Campo, Lucia; Eriksen, Tomas Kvalheim; Görgen, Andreas; Hadynska-Klek, Katarzyna; Ingeberg, Vetle Wegner; Midtbø, Jørgen E.; Sahin, Eda; Tornyi, Tamas Gabor; Voinov, Alexander; Wiedeking, Mathis & Wilson, Jonathan (2019). Restricted spin-range correction in the Oslo method: The example of nuclear level density and γ-ray strength function from 239Pu(d, pγ) 240Pu. Physical Review C.  ISSN 2469-9985.  100:024305(2), s 1- 9 . doi: 10.1103/PhysRevC.100.024305 Fulltekst i vitenarkiv.
• Crespo Campo, Lucia; Guttormsen, Magne Sveen; Bello Garrote, Frank Leonel; Eriksen, Tomas Kvalheim; Giacoppo, Francesca; Görgen, Andreas; Hadynska-Klek, Katarzyna; Klintefjord, Malin; Larsen, Ann-Cecilie; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva; Springer, A.; Tornyi, Tamas Gabor & Tveten, Gry Merete (2018). Test of the generalized Brink-Axel hypothesis in 64,65Ni. Physical Review C.  ISSN 2469-9985.  98, s 054303-1- 054303-10 . doi: 10.1103/PhysRevC.98.054303 Fulltekst i vitenarkiv. Vis sammendrag

  Previously published particle-γ coincidence data on the 64Ni(p,p′γ)64Ni and 64Ni(d,pγ)65Ni reactions were further analyzed to study the statistical properties of γ decay in 64,65Ni. To do so, the γ decay to the quasicontinuum region and discrete low-lying states was investigated at γ-ray energies of 2.0–9.6 and 1.6–6.1 MeV in 64 Ni and 65 Ni, respectively. In particular, the dependence of the γ -strength function with initial and final excitation energy was studied to test the validity of the generalized Brink-Axel hypothesis. Finally, the role of fluctuations in transition strengths was estimated as a function of γ-ray and excitation energy. The γ -strength function is consistent with the hypothesis of the independence of initial excitation energy, in accordance with the generalized Brink-Axel hypothesis. The results show that the γ decay to low-lying levels displays large fluctuations for low initial excitation energies.

• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv. Vis sammendrag

  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.

• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• 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
• 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 Fulltekst i vitenarkiv.
• Giacoppo, Francesca; Bello Garrote, Frank Leonel; 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: 10.1051/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 Fulltekst i vitenarkiv.
• Kheswa, Bonginkosi Vincent; Wiedeking, Mathis; Giacoppo, Francesca; Goriely, Stephane; 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). Statistical nuclear properties and synthesis of La-138. The European Physical Journal Conferences.  ISSN 2101-6275.  93 . doi: 10.1051/epjconf/20159304005
• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• 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
• 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 Fulltekst i vitenarkiv.
• 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
• 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 Fulltekst i vitenarkiv.
• 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

Se alle arbeider i Cristin

• 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. Vis sammendrag

  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.

• 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.
• 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.
• 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.

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