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Proton decay of {sup 108}I and its significance for the term


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


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 emission, suggesting a origin. Using the extracted 108I proton-decay Q value of 597(13) keV, and the 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 value is lower than that for the less-exotic neighbor 109I, possibly due to enhanced proton-neutron interactions in nuclei. In contrast, the present is higher than that of 105Sb, suggesting a weaker interaction energy. For the present 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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