Gamma-Ray Decay of the 7.66-Mev Level of C12

David E. Alburger
Phys. Rev. 124, 193 – Published 1 October 1961
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Abstract

Proton-gamma-gamma triple coincidence measurements have been carried out on the B10(He3, p)C12 reaction at EHe3=2.2 Mev. Protons were detected in a 34-in. diameter CsI crystal subtending a solid angle of 27% of 4π at the target, the gamma-ray detectors were 5 in. × 5 in. NaI crystals, and the coincidence resolving time was 8×109 sec. The spectrum of protons in triple coincidence with the two gamma-ray detectors, each channeled from 2.4 to 5.0 Mev, contains a line corresponding to the alpha-emitting 7.66-Mev 0+second-excited state of C12. This line is interpreted as resulting from the 3.23-4.43-Mev cascade gamma-ray decay of the 7.66-Mev level through the 4.43-Mev 2+ first-excited state. The ratio of the triples to singles counting rates of the 7.66-Mev proton line, when corrected by the appropriate factors for gamma-ray efficiency, leads to a 3.23-Mev gamma-ray branch of (3.3±0.9)×104 per decay of the 7.66-Mev level. This branch, which compares with a previous theoretical estimate of ∼2×104, is stronger than the direct ground-state transition by a factor of 50.

  • Received 22 May 1961

DOI:https://doi.org/10.1103/PhysRev.124.193

©1961 American Physical Society

Authors & Affiliations

David E. Alburger

  • Brookhaven National Laboratory, Upton, New York

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Vol. 124, Iss. 1 — October 1961

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