Ground-state proton decay of 69Br and implications for the rp-process 68Se waiting-point
Résumé
The first direct measurement of the proton separation energy, S p, for the proton-unbound nucleus 69Br is reported. Of interest is the exponential dependence of the 2p-capture rate on S p which can bypass the 68Se waiting-point in the astrophysical rp process. An analysis of the observed proton decay spectrum is given in terms of the 69Se mirror nucleus and the influence of S p is explored within the context of a single-zone X-ray burst model.