A high-entropy wind r-process study based on nuclear-structure quantities from the new finite-range droplet model FRDM(2012)

Abstract

Theoretical studies of the nucleosynthesis origin of the heavy elements in our Solar System (S.S.) by the rapid neutron-capture process (r-process) still face the entwined uncertainties in the possible astrophysical scenarios and the nuclear-physics properties far from stability. In this paper we present results from the investigation of an r-process in the high-entropy wind (HEW) of core-collapse supernovae (here chosen as one of the possible scenarios for this nucleosynthesis process), using new nuclear-data input calculated in a consistent approach, for masses and $\beta$-decay properties from the new finite-range droplet model FRDM(2012). The accuracy of the new mass model is 0.56 MeV with respect to {\sc AME2003}, to which it was adjusted. We compare the new HEW r-process abundance pattern to the latest S.S. r-process residuals and to our earlier calculations with the nuclear-structure quantities based on FRDM(1992). Substantial overall and specific local improvements in the calculated pattern of the r-process between $A\simeq 110$ and ${}^{209}$Bi, as well as remaining deficiencies are discussed in terms of the underlying spherical and deformed shell structure far from stability.

8 pages, 4 figures

References in corpus (7)

• Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XII: Stiffness and stability of neutron-star matter
• Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?
• Silver and palladium help unveil the nature of a second r-process
• Integrated Nucleosynthesis in Neutrino Driven Winds
• Beta-decay half-lives and beta-delayed neutron emission probabilities of nuclei in the region below A=110, relevant for the r-process
• Nucleosynthesis Modes in the High-Entropy-Wind of Type II Supernovae: Comparison of Calculations with Halo-Star Observations
• Impact of New beta-decay Half-lives on r-process Nucleosynthesis

Cited by in corpus (3)

• The intermediate r-process in core-collapse supernovae driven by the magneto-rotational instability
• Galactic Chemical Evolution: the Impact of the 13C-pocket Structure on the s-process Distribution
• The Populations of Carina. II. Chemical Enrichment