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

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.48.3097· OSTI ID:5683329

Winger, J A; Bazin, D P; Benenson, W; Crawley, G M; Morrissey, D J; Orr, N A; Pfaff, R; Sherrill, B M; Thoennessen, M; Yennello, S J; Young, B M ^[1]

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1. The National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States) Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States) Department of Chemistry, Michigan State University, East Lansing, Michigan 48824 (United States)

The [ital 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 [ital A][approx gt]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 [beta]-decay half-lives of several [ital T][sub [ital z]]=[minus]1/2 nuclei in this mass region by identification and implantation of projectile fragments followed by a rapid beam cutoff and observation of the [beta] decay. Using this technique, the half-lives of [sup 61]Ga, [sup 63]Ge, and [sup 65]As (0.15[plus minus]0.03 s, 95[sub [minus]20][sup +23] ms, and 0.19[sub [minus]0.07][sup +0.11] s, respectively) have been measured and are found to be consistent with expectations from [beta]-decay theory for decay between mirror states with [ital Q][sub [beta]][similar to]9 MeV. In addition, the proton-rich nucleus [sup 66]Se has been observed for the first time. The experimental method used for this measurement and the implications of these results for the [ital rp] process are discussed.

• OSTI ID: 5683329
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 48:6; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARSENIC 65
BETA-PLUS DECAY
HALF-LIFE
GALLIUM 61
GERMANIUM 64
BINDING ENERGY
CROSS SECTIONS
SELENIUM ISOTOPES
ARSENIC ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY
EVEN-EVEN NUCLEI
GALLIUM ISOTOPES
GERMANIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR DECAY
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
YEARS LIVING RADIOISOTOPES
663210* - Ground-State Radioactivity- (1992-)
663550 - Nuclear Mass Ranges- A=59-89- (1992-)
663110 - General & Average Properties of Nuclei & Nuclear Energy Levels- (1992-)