Proton decay of 108I and its significance for the termination of the astrophysical rp-process
Auranen, K., Seweryniak, D., Albers, M., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., . . . Zhu, S. (2019). Proton decay of 108I and its significance for the termination of the astrophysical rp-process. Physics Letters B, 792, 187-192. doi:10.1016/j.physletb.2019.03.039
Published inPhysics Letters B
Copp, P. |
© 2019 Published by Elsevier B.V.
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=2emission, 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)  predict no significant branching into the Sn-Sb-Te cycle at 103Sn.