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4 results on '"Larsen, André"'

1. Experimentally constrained (p,γ) y 89 and (n,γ) y 89 reaction rates relevant to p -process nucleosynthesis

Author

Larsen, André, Giacoppo, F, Görgen, Andreas, Hagen, T.W., Klintefjord, M., Renstrøm, Therese, Rose, S.J., Sahin, Ercan, Siem, Sunniva, Tornyi, T.G., Tveten, G.M., Guttormsen, Magne, Voinov, A., Wiedeking, M., Schwengner, Ronald, Bleuel, Darren D.L., Goriely, Stéphane, Harissopulos, Sotirios, Bello Garrote, F.L., Byun, Y., Eriksen, T.K., Larsen, André, Giacoppo, F, Görgen, Andreas, Hagen, T.W., Klintefjord, M., Renstrøm, Therese, Rose, S.J., Sahin, Ercan, Siem, Sunniva, Tornyi, T.G., Tveten, G.M., Guttormsen, Magne, Voinov, A., Wiedeking, M., Schwengner, Ronald, Bleuel, Darren D.L., Goriely, Stéphane, Harissopulos, Sotirios, Bello Garrote, F.L., Byun, Y., and Eriksen, T.K.

Abstract

The nuclear level density and the γ-ray strength function have been extracted for Y89 by using the Oslo method on Y89(p,p′γ)Y89 coincidence data. The γ-ray strength function displays a low-energy enhancement consistent with previous observations in this mass region (Mo93-98). Shell-model calculations support the conclusion that the observed enhancement is due to strong, low-energy M1 transitions at high excitation energies. The data were further used as input for calculations of the Sr88(p,γ)Y89 and Y88(n,γ)Y89 cross sections with the talys reaction code. Comparison with cross-section data, where available, as well as with values from the BRUSLIB library, shows a satisfying agreement., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2016

2. Statistical nuclear properties and synthesis of 138La

Author

Kheswa, B.V., Hagen, T.W., Koehler, P., Klintefjord, M., Nyhus, Hilde Therese, Papka, Paul, Renstrøm, Therese, Rose, S.J., Sahin, Esin, Siem, Sunniva, Tornyi, T.G., Wiedeking, M., Giacoppo, F, Goriely, Stéphane, Guttormsen, Magne, Larsen, André, Bello Garrote, F.L., Eriksen, T.K., Görgen, Andreas, Kheswa, B.V., Hagen, T.W., Koehler, P., Klintefjord, M., Nyhus, Hilde Therese, Papka, Paul, Renstrøm, Therese, Rose, S.J., Sahin, Esin, Siem, Sunniva, Tornyi, T.G., Wiedeking, M., Giacoppo, F, Goriely, Stéphane, Guttormsen, Magne, Larsen, André, Bello Garrote, F.L., Eriksen, T.K., and Görgen, Andreas

Abstract

The synthesis of the neutron deficient 138La nucleus has been a puzzle for a long time. It has not been clear whether it is produced through photodisintegration processes or neutrino induced reactions due to unavailability of experimental data for nuclear level densities and γ strength functions of 138,139La nuclei. In the present work these nuclear properties have been measured and are used to investigate the synthesis of 138La. The results support the neutrino interactions as a dominant production process for 138La., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2015

3. First evidence of low energy enhancement in Ge isotopes

Author

Renstrøm, Therese, Bernstein, L.A., Bleuel, Darren D.L., Glodariu, Tudor, Görgen, Andreas, Hagen, T.W., Lui, Yiu-Wing, Negi, D., Ruud, I.E., Sahin, Esin, Schwengner, Ronald, Nyhus, Hilde Therese, Shima, Tatsushi, Takahisa, Keiji, Tesileanu, Ovidiu, Tornyi, T.G., Tveten, G.M., Wiedeking, M., Utsunomiya, Hiroaki, Larsen, André, Siem, Sunniva, Guttormsen, Magne, Filipescu, Dan Mihai, Gheorghe, Ioana, Goriely, Stéphane, Renstrøm, Therese, Bernstein, L.A., Bleuel, Darren D.L., Glodariu, Tudor, Görgen, Andreas, Hagen, T.W., Lui, Yiu-Wing, Negi, D., Ruud, I.E., Sahin, Esin, Schwengner, Ronald, Nyhus, Hilde Therese, Shima, Tatsushi, Takahisa, Keiji, Tesileanu, Ovidiu, Tornyi, T.G., Tveten, G.M., Wiedeking, M., Utsunomiya, Hiroaki, Larsen, André, Siem, Sunniva, Guttormsen, Magne, Filipescu, Dan Mihai, Gheorghe, Ioana, and Goriely, Stéphane

Abstract

The γ-strength functions and level densities of 73,74Ge have been extracted from particle-γ coincidence data using the Oslo method. In addition the γ-strength function of 74Ge above the neutron separation threshold, Sn = 10.196 MeV has been extracted from photoneutron measurements. When combined, these two experiments give a γ-strength function covering the energy range of ∼1-13 MeV for 74Ge. This thorough investigation of 74Ge is a part of an international campaign to study the previously reported low energy enhancement in this mass region in the γ-strength function from ∼3 MeV towards lower γ energies. The obtained data show that both 73,74Ge display an increase in strength at low γ energies., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2015

4. Upbend and M1 scissors mode in neutron-rich nuclei - Consequences for r-process (n,γ) reaction rates

Author

Larsen, André, Giacoppo, F, Guttormsen, Magne, Görgen, Andreas, Harissopulos, Sotirios, Leoni, Silvia, Liddick, Sean S.N., Naqvi, F., Nyhus, Hilde Therese, Rose, S.J., Renstrøm, Therese, Goriely, Stéphane, Schwengner, Ronald, Siem, Sunniva, Spyrou, Artemis, Tveten, G.M., Voinov, A., Wiedeking, M., Bernstein, L.A., Bleuel, Darren D.L., Bracco, Angela, Brown, Alex, Camera, Franco, Eriksen, T.K., Frauendorf, Stefan, Larsen, André, Giacoppo, F, Guttormsen, Magne, Görgen, Andreas, Harissopulos, Sotirios, Leoni, Silvia, Liddick, Sean S.N., Naqvi, F., Nyhus, Hilde Therese, Rose, S.J., Renstrøm, Therese, Goriely, Stéphane, Schwengner, Ronald, Siem, Sunniva, Spyrou, Artemis, Tveten, G.M., Voinov, A., Wiedeking, M., Bernstein, L.A., Bleuel, Darren D.L., Bracco, Angela, Brown, Alex, Camera, Franco, Eriksen, T.K., and Frauendorf, Stefan

Abstract

An enhanced probability for low-energy γ-emission (upbend, Eγ <3 MeV) at high excitation energies has been observed for several light and mediummass nuclei close to the valley of stability. Also the M1 scissors mode seen in deformed nuclei increases the γ-decay probability for low-energy γ-rays (Eγ ≈ 2-3 MeV). These phenomena, if present in neutron-rich nuclei, have the potential to increase radiative neutron-capture rates relevant for the r-process. The experimental and theoretical status of the upbend is discussed, and preliminary calculations of (n,γ) reaction rates for neutronrich, mid-mass nuclei including the scissors mode are shown., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2015

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