Employing the Argonne Fragment Mass Analyzer and the implantation-decay-decay correlation technique, a weak 0.50(21)% proton decay branch was identified in I-108 for the first time. The I-108 proton-decay width is consistent with a hindered l = 2 emission, suggesting a d(5/2) origin. Using the extracted I-108 proton-decay Q value of 597(13) keV, and the Q(alpha) values of the I-108 and Te-107 isotopes, a protondecay Q value of 510(20) keV for Sb-104 was deduced. Similarly to the (112,113)cs proton-emitter pair, the Q(p) (I-108) value is lower than that for the less-exotic neighbor I-109, possibly due to enhanced protonneutron interactions in N approximate to Z nuclei. In contrast, the present Q(p) (Sb-104) is higher than that of 108 Sb, suggesting a weaker interaction energy. For the present Q(p)(Sb-104) 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 Sn-103.
Proton decay of 108 I 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. Sethi, R. Talwar, W.B. Walters, P.J. Woods, S. Zhu. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 792(2019 May 10), pp. 187-192.
Proton decay of 108 I and its significance for the termination of the astrophysical rp-process
S. Bottoni;
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 I-108 for the first time. The I-108 proton-decay width is consistent with a hindered l = 2 emission, suggesting a d(5/2) origin. Using the extracted I-108 proton-decay Q value of 597(13) keV, and the Q(alpha) values of the I-108 and Te-107 isotopes, a protondecay Q value of 510(20) keV for Sb-104 was deduced. Similarly to the (112,113)cs proton-emitter pair, the Q(p) (I-108) value is lower than that for the less-exotic neighbor I-109, possibly due to enhanced protonneutron interactions in N approximate to Z nuclei. In contrast, the present Q(p) (Sb-104) is higher than that of 108 Sb, suggesting a weaker interaction energy. For the present Q(p)(Sb-104) 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 Sn-103.File | Dimensione | Formato | |
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