Modification of nuclear transitions in stellar plasma by electronic processes: K isomers in Lu176 and Ta180 under s-process conditions

G. Gosselin, P. Morel, and P. Mohr
Phys. Rev. C 81, 055808 – Published 28 May 2010

Abstract

The influence of the stellar plasma on the production and destruction of K isomers is studied for the examples Lu176 and Ta180. Individual electromagnetic transitions are enhanced predominantly by nuclear excitation by electron capture, whereas the other mechanisms of electron scattering and nuclear excitation by electron transition give only minor contributions. It is found that individual transitions can be enhanced significantly for low transition energies below 100 keV. Transitions with higher energies above 200 keV are practically not affected. Although one low-energy transition in Ta180 is enhanced by up to a factor of 10, the stellar transition rates from low-K to high-K states via so-called intermediate states in Lu176 and Ta180 do not change significantly under s-process conditions. The s-process nucleosynthesis of Lu176 and Ta180 remains essentially unchanged.

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  • Received 24 January 2010

DOI:https://doi.org/10.1103/PhysRevC.81.055808

©2010 American Physical Society

Authors & Affiliations

G. Gosselin* and P. Morel

  • CEA, DAM, DIF, Arpajon F-91297, France

P. Mohr

  • Diakonie-Klinikum Schwäbisch Hall, Diakoniestraße 10, Schwäbisch Hall D-74523, Germany and Institute of Nuclear Research (ATOMKI), Debrecen H-4001, Hungary

  • *gilbert.gosselin@cea.fr
  • pascal.morel@cea.fr
  • WidmaierMohr@t-online.de

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Vol. 81, Iss. 5 — May 2010

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