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

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This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic ^{208}Pb. The lifetimes of the 126-neutron shell isotone ^{204}Pt and the neighboring ^{200-202}Ir, ^{203}Pt, ^{204}Au 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 β 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 β decay back to stability.


  • A I Morales
  • J Benlliure
  • T Kurtukián-Nieto
  • K-H Schmidt
  • S Verma
  • P H Regan
  • Z Podolyák
  • M Górska
  • 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 Cáceres
  • And 27 others
  • I J Cullen
  • A M Denis Bacelar
  • P Doornenbal
  • M E Estévez-Aguado
  • G Farrelly
  • Y Fujita
  • A B Garnsworthy
  • W Gelletly
  • J Gerl
  • J Grebosz
  • Robert Hoischen
  • I Kojouharov
  • N Kurz
  • S Lalkovski
  • Z Liu
  • C Mihai
  • F Molina
  • D Mücher
  • B Rubio
  • H Shaffner
  • S J Steer
  • A Tamii
  • S Tashenov
  • J J Valiente-Dobón
  • P M Walker
  • H J Wollersheim
  • P J Woods
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number022702
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 2014
Publication categoryResearch

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