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Sensitivity studies for the main r process: β-decay rates
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/content/aip/journal/adva/4/4/10.1063/1.4867192
2014-02-26
2014-07-30

Abstract

The pattern of isotopic abundances produced in rapid neutron capture, or -process, nucleosynthesis is sensitive to the nuclear physics properties of thousands of unstable neutron-rich nuclear species that participate in the process. It has long been recognized that the some of the most influential pieces of nuclear data for -process simulations are β-decay lifetimes. In light of experimental advances that have pushed measurement capabilities closer to the classic -process path, we revisit the role of individual β-decay rates in the process. We perform β-decay rate sensitivity studies for a main ( > 120) process in a range of potential astrophysical scenarios. We study the influence of individual rates during (, γ)-(γ, ) equilibrium and during the post-equilibrium phase where material moves back toward stability. We confirm the widely accepted view that the most important lifetimes are those of nuclei along the -process path for each astrophysical scenario considered. However, we find in addition that individual β-decay rates continue to shape the final abundance pattern through the post-equilibrium phase, for as long as neutron capture competes with β decay. Many of the lifetimes important for this phase of the process are within current or near future experimental reach.

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Scitation: Sensitivity studies for the main r process: β-decay rates
http://aip.metastore.ingenta.com/content/aip/journal/adva/4/4/10.1063/1.4867192
10.1063/1.4867192
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