UPBEND AND M1 SCISSORS MODE IN NEUTRON-RICH NUCLEI -CONSEQUENCES FOR r-PROCESS (n, gamma) REACTION RATES

作者：Larsen A C^*; Goriely S; Bernstein L A; Bleuel D L; Bracco A; Brown B A; Camera F; Eriksen T K; Frauendorf S; Giacoppo F; Guttormsen M; Gorgen A; Harissopulos S; Leoni S; Liddick S N; Naqvi F; Nyhus H T; Rose S J; Renstrom T; Schwengner R; Siem S; Spyrou A; Tveten G M; Voinov A V; Wiedeking M

来源：Acta Physica Polonica B, 2015, 46(3): 509-512.

DOI：10.5506/APhysPolB.46.509

An enhanced probability for low-energy gamma-emission (upbend, E-gamma < 3 MeV) at high excitation energies has been observed for several light and medium-mass nuclei close to the valley of stability. Also the M1 scissors mode seen in deformed nuclei increases the gamma-decay probability for low-energy gamma-rays (E-gamma approximate to 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, gamma) reaction rates for neutron-rich, mid-mass nuclei including the scissors mode are shown.

• 出版日期2015-3