Ground-state proton decay of 69Br and implications for the 68Se astrophysical rp-process waiting point
Journal Article
·
· Physical Review Letters
- Argonne National Laboratory (ANL)
- Western Michigan University
- Michigan State University, East Lansing
- ORNL
We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus {sup 69}Br. Bypassing the {sup 68}Se waiting point in the rp process is directly related to the 2p-capture rate through {sup 69}Br, which depends exponentially on the proton separation energy. We find a proton separation energy for {sup 69}Br of S{sub p}({sup 69}Br) = -785{sub -40}{sup +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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Other RIB Facility
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1019373
- Journal Information:
- Physical Review Letters, Vol. 106, Issue 25; ISSN 0031--9007
- Country of Publication:
- United States
- Language:
- English
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