Upbend and M1 Scissors Mode in Neutron-rich Nuclei --- Consequences for r-process $(n,\gamma )$ Reaction Rates
- Larsen, AC;
- Goriely, S;
- Bernstein, LA;
- Bleuel, DL;
- Bracco, A;
- Brown, BA;
- Camera, F;
- Eriksen, TK;
- Frauendorf, S;
- Giacoppo, F;
- Guttormsen, M;
- Görgen, A;
- Harissopulos, S;
- Leoni, S;
- Liddick, SN;
- Naqvi, F;
- Nyhus, HT;
- Rose, SJ;
- Renstrøm, T;
- Schwengner, R;
- Siem, S;
- Spyrou, A;
- Tveten, GM;
- Voinov, AV;
- Wiedeking, M
- et al.
Published Web Location
http://www.actaphys.uj.edu.pl/fulltext?series=Reg&vol=46&page=509Abstract
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.
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