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Title: Upbend and M1 scissors mode in neutron-rich nuclei - consequences for r-process $$(n,\gamma )$$ reaction rates

An enhanced probability for low-energy γ-emission (upbend, Eγ < 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 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. Furthermore, the experimental and theoretical status of the upbend is discussed, and preliminary calculations of (n,γ) reaction rates for neutron-rich, mid-mass nuclei including the scissors mode are shown.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [5] ;  [1] ;  [7] ;  [1] ;  [1] ;  [1] ;  [8] ;  [5] ;  [6] ;  [6] ;  [1] ;  [1] ;  [1] ;  [9] more »;  [1] ;  [6] ;  [1] ;  [10] ;  [11] « less
  1. Univ. of Oslo, Oslo (Norway)
  2. Institut d'Astronomie et d'Astrophysique, Brussels (Belgium)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. INFN, Milano (Italy); Univ. of Milano, Milano (Italy)
  6. Michigan State Univ., East Lansing, MI (United States)
  7. Univ. of Notre Dame, Notre Dame, IN (United States)
  8. Institute of Nuclear Physics, Athens (Greece)
  9. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  10. Ohio Univ., Athens, OH (United States)
  11. iThemba LABS, Somerset West (South Africa)
Publication Date:
OSTI Identifier:
1256979
Grant/Contract Number:
NA0001837; FG02-88ER40387
Type:
Accepted Manuscript
Journal Name:
Acta Physica Polonica. Series B
Additional Journal Information:
Journal Volume: 46; Journal Issue: 3; Conference: Zakopane Conference on Nuclear Physics Extremes of the Nuclear Landscape, Zakopane (Poland), 31 Aug - 7 Sep 2014; Journal ID: ISSN 0587-4254
Publisher:
Jagiellonian University
Research Org:
Ohio Univ., Athens, OH (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS gamma strength; scissors mode