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Physical Review Letters 106 (2011) 252503
Ground-State Proton Decay of 69Br and Implications for the 68Se Astrophysical Rapid Proton-Capture Process Waiting Point
A.M. Rogers, M.A. Famiano, W.G. Lynch, M.S. Wallace, F. Amorini, D. Bazin, R.J. Charity, F. Delaunay1, R.T. De Souza, J. Elson, A. Gade, D. Galaviz, M.-J. Van Goethem, S. Hudan, J. R. Lee, S. Lobastov, S. Lukyanov, M. Matoš, M. Mocko, H. Schatz, D. Shapira, L.G. Sobotka, M.B. Tsang, G. Verde

We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus 69Br. Bypassing the 68Se waiting point in the rp process is directly related to the 2p-capture rate through 69Br, which depends exponentially on the proton separation energy. We find a proton separation energy for 69Br of Sp(69Br)=-785-40+34  keV; this is less bound compared to previous predictions which have relied on uncertain theoretical calculations. The influence of the extracted proton separation energy on the rp process occurring in type I x-ray bursts is examined within the context of a one-zone burst model.
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
Structure nucléaire
Physique/Physique Nucléaire Expérimentale
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