β-Decay Half-Lives of 55 Neutron-Rich Isotopes beyond the N=82 Shell Gap

2020/03/31 by J. Wu, S. Nishimura, P. Möller +48 · 1 citation
Physics and Astronomy · #nucl-ex

paper · pdf · doi:10.1103/physrevc.101.042801

arxiv created 2020/03/31 · arxiv updated 2020/05/04

Abstract

The β-decay half-lives of 55 neutron-rich nuclei ^134-139Sn, ^134-142Sb, ^137-144Te, ^140-146I, ^142-148Xe, ^145-151Cs, ^148-153Ba, ^151-155La were measured at the Radioactive Isotope Beam Factory (RIBF) employing the projectile fission fragments of ²³⁸U. The nuclear level structure, which relates to deformation, has a large effect on the half-lives. The impact of newly-measured half-lives on modeling the astrophysical origin of the heavy elements is studied in the context of r process nucleosynthesis. For a wide variety of astrophysical conditions, including those in which fission recycling occurs, the half-lives have an important local impact on the second (A ≈ 130) peak.

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