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SOME N$sup 12$ AND B$sup 12$ BETA-DECAY MEASUREMENTS

Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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
;
The branching fractions of the B/sup 12/ and N/sup 12/ beta decays to the 4.43-Mev level of C/sup 12/ were determined to be (1.3 plus or minus 0.1)% and (2.4 plus or minus 0.2)%, respectively, by means of BETA gamma - coincidence measurements. The B/sup 12/ and N/sup 12/ half-lives were remeasured, using a beta-ray spectrometer to identify the emitted beta particles, and found to be 20.2 plus or minus 0.2 msec and 11.0 plus or minus 0.1 msec, respectively. The thin-target cross section curve for the B/sup 10/(He/sup 3/ ,n)N/sup 12/ reaction was measured over the energy range from 2.0 to 6.3 Mev. Using the above half-lives and branching ratios, the ratio of the N/sup 12/ to B/ sup 12/ ft values for transitions to the 4.43-Mev level of C/sup 12/ was calculated to be 0.92 plus or minus 0.06. With the use of published data and the above half-lives, the ratio of ft values of the N/sup 12/ to B/sup 12/ groundstate transitions was calculated to be 1.16 plus or minus 0.03. Thus, there appears to be a significant difference in the B/sup 12/ and N/sup 12/ ground- state transition ft values. (auth)
Research Organization:
Los Alamos Scientific Lab., N. Mex.
NSA Number:
NSA-17-017236
OSTI ID:
4741767
Report Number(s):
LADC-5562; 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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 130; ISSN PHRVA
Country of Publication:
United States
Language:
English

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Related Subjects

BETA DECAY
BETA SPECTROMETERS
BORON 10
BORON 12
BRANCHING RATIO
CARBON 12
COINCIDENCE METHODS
CROSS SECTIONS
ENERGY
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
HALF-LIFE
HELIUM 3
MEASURED VALUES
NEUTRONS
NITROGEN 12
NUCLEAR REACTIONS
NUMERICALS
PHYSICS
TARGETS