Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates

A. C. Larsen, M. Guttormsen, F. L. Bello Garrotte, L. A. Bernstein, D. L. Bleuel, A. Bracco, B. A. Brown, F. Camera, L. Crespo Campo, S. Frauendorf, B. L. Goldblum, S. Goriely, A. Görgen, K. Hadynska-Klek, T. W. Hagen, S. Harissopulos, B. V. Kheswa, M. Klintefjord, S. Leoni, S. N. LiddickF. Naqvi, G. Perdikakis, T. Renstrøm, A. M. Rogers, S. J. Rose, E. Sahin, R. Schwengner, S. Siem, A. Simon, A. Spyrou, G. M. Tveten, A. Voinov, M. Wiedeking, H. Utsunomiya

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

An unexpected enhancement in the average, reduced γ-decay strength at very low γ-transition energies has been observed in f p-shell nuclei as well as in the Mo region. Very recently, it has been discovered in 138La, which is, so far, the heaviest nucleus to display this feature. In this work, we present an experimental and theoretical overview of the low-energy enhancement. In particular, experimental evidence for the dipole nature of the enhancement, and shell-model calculations indicating strong, low-energy M1 transitions are shown. Possible implications of this low-energy enhancement on astrophysical (n; γ) reaction rates of relevance for r-process nucleosynthesis are discussed.

Original languageEnglish
Title of host publicationProceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015
EditorsAlfredo Ferrari, Toshihiko Kawano, Mark Chadwick, Francesco Cerutti, P. Schoofs
PublisherCERN
Pages271-276
Number of pages6
ISBN (Electronic)9789290834182
StatePublished - 1 Jan 2015
Externally publishedYes
Event14th International Conference on Nuclear Reaction Mechanisms, NRM 2015 - Varenna, Italy
Duration: 15 Jun 201519 Jun 2015

Publication series

NameProceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015

Conference

Conference14th International Conference on Nuclear Reaction Mechanisms, NRM 2015
Country/TerritoryItaly
CityVarenna
Period15/06/1519/06/15

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Nuclear and High Energy Physics

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