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

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 SethiR Talwar, W. B. Walters, Philip Woods, S. Zhu

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


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