Waiting points in the astrophysical rp process: How unbound are Br69 and Rb73?

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Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Projectile And Target Fragmentation, 59<=A<=89

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One of the key uncertainties in our understanding of the astrophysical rp process is the extent to which even-even N=Z nuclei such as Se68 and Kr72 act as waiting points in the process because of the next nucleus in the proton-capture chain being proton unbound. For these specific cases, much of the argument is based on the nonobservation of Br69 and Rb73 following projectile fragmentation. An examination of the nuclear structure involved, and the high population of low-lying isomers in the mirror nuclei, Se69 and Kr73 in fragmentation, suggests that this nonobservation may be down to a shadowing mechanism where the majority of the population goes to the isomer that proton decays before the ground state can be reached. Strong conclusions on the extent to which the Br69 and Rb73 are unbound may therefore be unsafe. The possible astrophysical implications of this are discussed along with the relevance of this shadowing mechanism to the search for exotic nuclei in fragmentation.

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