Ground-State Proton Decay of Br-69 and Implications for the Se-68 Astrophysical Rapid Proton-Capture Process Waiting Point
- Rogers, A. M.
- Famiano, M. A.
- Lynch, W. G.
- Wallace, M. S.
- Amorini, F.
- Bazin, D.
- Charity, R. J.
- Delaunay, F.
- de Souza, R. T.
- Elson, J.
- Gade, A.
- Galaviz, D.
- van Goethem, M. -J.
- Hudan, S.
- Lee, J.
- Lobastov, S.
- Lukyanov, S.
- Matos, M.
- Mocko, M.
- Schatz, H.
- Shapira, D.
- Sobotka, L. G.
- Tsang, M. B.
- Verde, G.
DOIAbstract
We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus Br-69. Bypassing the Se-68 waiting point in the rp process is directly related to the 2p-capture rate through Br-69, which depends exponentially on the proton separation energy. We find a proton separation energy for Br-69 of S-p(Br-69) = -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
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