Half-life measurements for Ga61, Ge63, and As65 and their importance in the rp process

J. A. Winger, D. P. Bazin, W. Benenson, G. M. Crawley, D. J. Morrissey, N. A. Orr, R. Pfaff, B. M. Sherrill, M. Thoennessen, S. J. Yennello, and B. M. Young
Phys. Rev. C 48, 3097 – Published 1 December 1993
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Abstract

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 Ga61, Ge63, and As65 (0.15±0.03 s, 9520+23 ms, and 0.190.07+0.11 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 Se66 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.

  • Received 12 July 1993

DOI:https://doi.org/10.1103/PhysRevC.48.3097

©1993 American Physical Society

Authors & Affiliations

J. A. Winger, D. P. Bazin, W. Benenson, G. M. Crawley, D. J. Morrissey, N. A. Orr, R. Pfaff, B. M. Sherrill, M. Thoennessen, S. J. Yennello, and B. M. Young

  • The National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
  • Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
  • Department of Chemistry, Michigan State University, East Lansing, Michigan 48824

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Vol. 48, Iss. 6 — December 1993

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