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

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

doi:doi/10.5506/APhysPolB.46.509

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Résumé :

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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