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CROSS SECTIONS FOR THE B$sup 11$(n,$gamma$)B$sup 12$ REACTION

Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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
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Cross sections for the reaction /sup 11/(n, gamma )B/sup 12/ were measured by an activation technique for neutron energies from 139 to 2325 kev and at thermal energy. Resonances in the reaction were observed at neutron energies of 430, 1030, 1280, and 1780 kev. Since the resonance at 1030 kev did not correspond to a known level in B/sup 12/, the total neutron cross section for boron was measured with 4-kev resolution in the neutron energy region between 950 and 1350 kev. An S wave resonance was observed in the total cross section at 1027 plus or minus 10 kev. This resonance corresponds to a level in B/sup 12/ at an excitation energy of 4.3l Mev; it most probably has spin and parity of l/ sup -/ and a width of 10 plus or minus 4 kev. From an analysis of the capture cross section resonances, the radiation widths of the levels were found to be 0.3 ev at 430 kev, 0.3 ev at 1027 kev, 0.2 ev at 1280 kev, and 0.9 ev at 1780 kev, with estimated uncertainties of 50%. The measured value of the B/sup 11/(n, gamma )B/sup 12/ cross section for thermal neutrons was 5 plus or minus 3 mb. (auth)
Research Organization:
Lockheed Missiles and Space Co., Palo Alto, Calif.
NSA Number:
NSA-16-014005
OSTI ID:
4785738
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 125; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

BORON 11
BORON 12
CROSS SECTIONS
ENERGY LEVELS
GAMMA RADIATION
MEASURED VALUES
NEUTRON BEAMS
NUCLEAR REACTIONS
PHYSICS
RESONANCE