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NONEXISTENCE OF A 9.0-Mev LEVEL IN C$sup 1$$sup 2$

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
OSTI ID:4075368
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An energy level in C/sup 1//sup 2/ at 9.0 Mev is reported as a result of (p, gamma , gamma ) triple coincidence measurements on the B/sup 1//sup 0/(He/sup 3/,p)C/sup 1//sup 2/ reaction at 2.2 Mev. This reaction is reinvestigated in a similar experimental arrangement by using alternately Pilot-B, CsI and NaI scintillators for detection of the protons. Only the Pilot-B, which is used in the previous work, exhibits the proton group corresponding to a 9.0 Mev level in C/sup 1//sup 2/. The triple coincidence effect in this case is actually due to the intense approximately 17 Mev protons in the B/sup 1//sup 0/(He/sup 3/,p)C/ sup 1//sup 2/ reaction leading to the 4.43 Mev first excited state of C/sup 1// sup 2/ which upon entering the scintillator can inelastically scatter from carbon and produce secondary gamma radiation of 4.43 Mev. The net energy deposited in the scintillator has the appearance of a proton group to a 9.0 Mev level in C/sup 1//sup 2/ in triple coincidence with two 4.43 Mev gamma rays. The magnitude of the effect is calculated from published cross sections for inelastic scattering and it agrees with the apparent population intensity of the nonexistent 9.0 Mev level. (auth)
Research Organization:
Brookhaven National Lab., Upton, N. Y.
NSA Number:
NSA-15-020182
OSTI ID:
4075368
Report Number(s):
BNL-5154; 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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 122; ISSN PHRVA
Country of Publication:
United States
Language:
English

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Related Subjects

CARBON 12
CESIUM IODIDES
COINCIDENCE METHODS
CROSS SECTIONS
ENERGY LEVELS
ENERGY RANGE
EXCITATION
GAMMA RADIATION
HELIUM 3
INELASTIC SCATTERING
MEASURED VALUES
NUCLEAR REACTIONS
NUMERICALS
PHYSICS
POLYMERS
PROTONS
SCATTERING
SCINTILLATION COUNTERS
SODIUM IODIDES