94β-Decay Half-Lives of Neutron-Rich Cs55 to Ho67: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation

J. Wu et al.
Phys. Rev. Lett. 118, 072701 – Published 16 February 2017; Erratum Phys. Rev. Lett. 120, 139902 (2018)
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Abstract

The β-decay half-lives of 94 neutron-rich nuclei Cs144151, Ba146154, La148156, Ce150158, Pr153160, Nd156162, Pm159163, Sm160166, Eu161168, Gd165170, Tb166172, Dy169173, Ho172175, and two isomeric states Er174m, Dy172m were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N=97 for Ce58, Pr59, Nd60, and Sm62, and N=105 for Eu63, Gd64, Tb65, and Dy66. Features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.

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  • Received 29 September 2016
  • Corrected 22 March 2018

DOI:https://doi.org/10.1103/PhysRevLett.118.072701

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Corrections

22 March 2018

Erratum

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Vol. 118, Iss. 7 — 17 February 2017

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