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Half-Life Systematics across the N=126 Shell Closure: Role of First-Forbidden Transitions in the beta Decay of Heavy Neutron-Rich Nuclei

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  • A. I. Morales
  • J. Benlliure
  • T. Kurtukian-Nieto
  • K. -H Schmidt
  • S. Verma
  • P. H. Regan
  • Z. Podolyak
  • M. Gorska
  • S. Pietri
  • R. Kumar
  • E. Casarejos
  • N. Al-Dahan
  • A. Algora
  • N. Alkhomashi
  • H. Alvarez-Pol
  • G. Benzoni
  • A. Blazhev
  • P. Boutachkov
  • A. M. Bruce
  • L. S. Caceres
  • I. J. Cullen
  • A. M. Denis Bacelar
  • P. Doornenbal
  • M. E. Estevez-Aguado
  • G. Farrelly
  • Y. Fujita
  • A. B. Garnsworthy
  • W. Gelletly
  • J. Gerl
  • J. Grebosz
  • R. Hoischen
  • I. Kojouharov
  • N. Kurz
  • S. Lalkovski
  • C. Mihai
  • F. Molina
  • D. Muecher
  • B. Rubio
  • H. Shaffner
  • S. J. Steer
  • A. Tamii
  • S. Tashenov
  • J. J. Valiente-Dobon
  • P. M. Walker
  • H. J. Wollersheim

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Original languageEnglish
Article number022702
Number of pages5
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 11 Jul 2014


This Letter reports on a systematic study of beta-decay half-lives of neutron-rich nuclei around doubly magic Pb-208. The lifetimes of the 126-neutron shell isotone Pt-204 and the neighboring Ir200-202, Pt-203, Au-204 are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden beta strength reveal significant deviations for most of the nuclei with N <126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during beta decay back to stability.

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