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GAMMA EMITTING STATES IN O$sup 16$ BELOW 12 Mev

Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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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A study has been made of states in 0/sup 16/ between 7.2- and 11.5-Mev excitation which belong to the sequence 0/sup -/, 1/sup +/, 2/sup -/, 3/sup +/, ..... (even angular momentum and odd parity, and vice versal. These states cannot break up into C/sup 12/ + alpha but must decay by gamma emission. The gamma rays from the F/sup 19/ (p, alpha gamma )O/sup 16/ and N/sup 15/(d,n gamma )O/sup 16/ reactions were studied at bom barding energies up to 6.0 and 5.08 Mev, respectively, using a three-crystal pair spectrometer and other scintillation counters. The design, resolution, and efficiency of the three- crystal pair spectrometer are given. The ground state transition from the 2/sup - /, 8.87-Mev state was observed to have 0.07 plus or minus 0.02 the intensity of the 2.73-Mev cascade transition to the 3/sup -/, 6.14-Mev state. A state was found at 10.98 plus or minus 0.04 Mev which decays predominantly to the 1/sup -/ , 7.12-Mev state. No gamma rays resulting from the decay of this state to other states of 0/sup 16/ were observed. The angular correlation of the 3.86- and 7.l2-Mev gamma rays shows a positive anisotropy of approximately l. These results suggest a 0/sup -/ spin and parity assignment for the 10.98-Mev state. The predictions of the alpha-particle and shell models of 0/sup 16/ are compared with these results. (auth)

Research Organization:
Columbia Univ., New York
NSA Number:
NSA-12-003173
OSTI ID:
4316709
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 108; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ALPHA PARTICLES-- ANGULAR DISTRIBUTION-- ANISOTROPY-- CARBON 12-- COINCIDENCE METHODS-- CRYSTALS-- DECAY-- DEUTERON BEAMS-- EFFICIENCY-- EMISSI
ALPHA PARTICLES-- ANGULAR DISTRIBUTION-- ANISOTROPY-- CARBON 12-- COINCIDENCE METHODS-- CRYSTALS-- DECAY-- DEUTERON BEAMS-- EFFICIENCY-- EMISSION-- ENERGY LEVELS-- ENERGY RANGE-- EXCITATION-- FLUORINE 19-- GAMMA RADIATION-- GAMMA SPECTROMETERS-- MEV RANGE-- MONOCRYSTALS-- NEUTRONS-- NITROGEN 15-- NITROGEN 16-- NUCLEAR MODELS-- NUCLEAR REACTIONS-- OXYGEN 16-- PAIR PRODUCTION-- PARITY-- PARTICLE MODELS-- PLANNING-- PROTON BEAMS-- RESOLUTION-- SCINTILLATION COUNTERS-- SHELL MODELS-- SPECTROMETERS-- SPIN
PHYSICS