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EVAPORATION OF COINCIDENT PROTONS IN /cap alpha/ + Ni$sup 58$ REACTIONS

Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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 was made of nuclear reactions in which two or more protons are emitted, in the bombardment of nickel isotopes by alpha particles. The most extensive data were obtained for 32-Mev alpha particles, using a Ni/sup 58/ target. A smaller amount of data were obtained at 27 and 42 Mev, and using Ni/ sup 60/ and Ni/sup 62/ targets. The two protons were observed in a coincidence arrangement, using scintillation counter dE/dx-E detectors. The energy correlations and distributions, the angular correlations and distributions, and the yields were compared with predictions based on the statistical theory. There was extensive agreement; most of the observed events arise from evaporation from an excited compound nucleus. For Ni/sup 58/ at 32 Mev, the cross section for compound nuclear events in which two or more protons are evaporated was 560 plus or minus 50 mb which is over one-third the total reaction cross section. This large cross section can be quantitatively understood in terms of the proton richness of the emitting compound nucleus. This follows from an analysis in which it is shown that the relative proton and neutron emission probabilities (especially using 14-Mev incident neutrons) are correlated with proton richness. (auth)
Research Organization:
Univ. of Washington, Seattle
NSA Number:
NSA-16-023113
OSTI ID:
4832560
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 126; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ALPHA BEAMS
ANGULAR DISTRIBUTION
COINCIDENCE METHODS
COMPOUND NUCLEI
CROSS SECTIONS
DISTRIBUTION
ENERGY
ENERGY RANGE
EVAPORATION
EXCITATION
IRRADIATION
NICKEL 58
NICKEL 60
NICKEL 62
NUCLEAR REACTIONS
NUCLEI
PHYSICS
PROTONS
SCINTILLATION COUNTERS
STATISTICS