GAMMA-RAY DECAY OF THE 7.66-MEV LEVEL OF C$sup 1$$sup 2$
S> Proton-gamma-gamma triple coincidence measurements have been carried out on the B/sup 10/(He/sup 3/,p)C/sup 12/ reaction at E/sub H/ i/sub e/3 = 2.2 Mev. Protons were detected in a 3/4-in. diameter CsI crystal subtending a solid angle of 27% of 4 pi at the target, the gamma-ray detectors were 5 in. x 5 in. NaI crystals, and the coincidence resolving time was 8 x 10/sup -9/ 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 7.66Mev 0+ second-excited state of C/sup 12/. 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+ firstexcited 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 3.23Mev gamma-ray branch of (3.3 plus or minus 0.9) x 10/sup -4/ per decay of the 7.66-Mev level. This branch, which compares with a previous theoretical estimate of approximately 2 x 10/sup -4/, is stronger than the direct ground-state transition by a factor of 50. (auth)
- Research Organization:
- Brookhaven National Lab., Upton, N.Y.
- NSA Number:
- NSA-15-032772
- OSTI ID:
- 4834616
- Report Number(s):
- BNL-5476; 0031-899X
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 124; ISSN PHRVA
- Country of Publication:
- United States
- Language:
- English
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