Affordable Access

Ground-state proton decay of 69Br and implications for the 68Se astrophysical rapid proton-capture process waiting point.

Authors
  • 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
  • Matoš, M
  • Mocko, M
  • Schatz, H
  • And 4 more
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
Jun 24, 2011
Volume
106
Issue
25
Pages
252503–252503
Identifiers
PMID: 21770637
Source
Medline
License
Unknown

Abstract

We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus (69)Br. Bypassing the (68)Se waiting point in the rp process is directly related to the 2p-capture rate through (69)Br, which depends exponentially on the proton separation energy. We find a proton separation energy for (69)Br of Sp((69)Br )= -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.

Report this publication

Statistics

Seen <100 times