Half-life measurements for 61Ga, 63Ge, and 65As and their importance in the rp process

Details Half-life measurements for 61Ga, 63Ge, and 65As and their importance in the rp process Half-life measurements for 61Ga, 63Ge, and 65As and their importance in the rp process

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvc..48.3097w&link_type=abstract

Physical Review C (Nuclear Physics), Volume 48, Issue 6, December 1993, pp.3097-3105

Physics

Nuclear Physics

21

Beta Decay, Double Beta Decay, Electron And Muon Capture, 59<=A<=89, Elementary Particle Processes, Lifetimes

Scientific paper

The rp process provides a mechanism whereby energy is generated and proton-rich nuclei are synthesized in various astrophysical environments. Understanding this process requires knowledge of the half-lives, binding energies, and reaction cross sections for the nuclei along its path, which for A>~60 lies near the proton-drip line. Using the A1200 radioactive-beam facility at the National Superconducting Cyclotron Laboratory, we have performed an experiment to measure the β-decay half-lives of several Tz=-1/2 nuclei in this mass region by identification and implantation of projectile fragments followed by a rapid beam cutoff and observation of the β decay. Using this technique, the half-lives of 61Ga, 63Ge, and 65As (0.15+/-0.03 s, 95+23-20 ms, and 0.19+0.11-0.07 s, respectively) have been measured and are found to be consistent with expectations from β-decay theory for decay between mirror states with Qβ~9 MeV. In addition, the proton-rich nucleus 66Se has been observed for the first time. The experimental method used for this measurement and the implications of these results for the rp process are discussed.

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