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Open Access Publications from the University of California

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

  • Author(s): 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.

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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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