The r-process peak at $A=130$ and $N=82$

ORAL

Abstract

It is well-known that r-process abundances can be modeled to some reasonable accuracy based on calculated beta-decay properties such as beta-decay half-lives, beta-delayed neutron-emission probabilities, neutron separation energies, and stellar environment conditions such as temperature, neutron densities and neutron-flux duration. However, characteristic deviations between observed and calcualted abundaces occur near the magic number peaks. Recently in measurements at Isolde full-spectroscopy data were obtained on $^{130}$Cd. This permitted an optimization of Nilsson-model parameters to this region of nuclei far from stability. Beta-decay half-lives calculated with this new set of Nilsson parameters are longer than our previously published 1997 tables. We present these and other features of the new r-process calculations near the $A=130$ peak.

*This work was carried out under the auspices of the National Nuclear Security Administration of the U.S. Department of Energy at Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396.

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Authors

  • Karl-Ludwig Kratz

    • Institut f{\"{u}}r Kernchemie, Universit{\"{a}}t Mainz
    • Institut f{\"{u}}r Kernchemie, Universit{\"{a}}t Mainz D-55099 Mainz, Germany
    • Institut f\"ur Kernchemie, Universit\"at Mainz

  • Peter M\"oller

    • Theoretical Division, Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory, Los Alamos NM 87545