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Proton decay of 108I and its significance for the termination of the astrophysical rp-process

Research output: Contribution to journalArticle

  • K Auranen
  • D. Seweryniak
  • M Albers
  • A. D. Ayangeakaa
  • S Bottoni
  • M. P. Carpenter
  • C. J. Chiara
  • P Copp
  • H. M. David
  • D. T. Doherty
  • J Harker
  • C.R. Hoffman
  • R V F Janssens
  • T. L. Khoo
  • S A Kuvin
  • T. Lauritsen
  • G Lotay
  • A. M. Rogers
  • C. Scholey
  • J Sethi
  • R Talwar
  • W. B. Walters
  • S. Zhu

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Original languageEnglish
JournalPhysics Letters B
Early online date22 Mar 2019
DOIs
Publication statusPublished - 1 May 2019

Abstract

Employing the Argonne Fragment Mass Analyzer and the implantation-decay-decay correlation technique, a weak 0.50(21)% proton decay branch was identified in 108I for the first time. The 108I proton-decay width is consistent with a hindered l=2 emission, suggesting a d52 origin. Using the extracted 108I proton-decay Q value of 597(13) keV, and the Qα values of the 108I and 107Te isotopes, a proton-decay Q value of 510(20) keV for 104Sb was deduced. Similarly to the 112,113Cs proton-emitter pair, the Qp(I108) value is lower than that for the less-exotic neighbor 109I, possibly due to enhanced proton-neutron interactions in N≈Z nuclei. In contrast, the present Qp(Sb104) is higher than that of 105Sb, suggesting a weaker interaction energy. For the present Qp(Sb104) value, network calculations with the one-zone X-ray burst model Mazzocchi et al. (2007) [18] predict no significant branching into the Sn-Sb-Te cycle at 103Sn.

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