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EVAPORATION OF CHARGED PARTICLES FROM HIGHLY EXCITED COMPOUND NUCLEI

Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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
; ;
Energy spectra and angular distributions of alpha particles and protons emitted in the bombardment of nickel targets with l60 Mev oxygen ions were measured. The initial compound nucleus is characterized approximately by Z = 36, A = 75, total excitation energy = 125 Mev, and rms angular momentum = 50h. The energy distributions had the shapes of evaporation spectra although they were displaced by several Mev toward lower energies compared to calculated evaporation spectra. The angular distributions were approximately symmetric about 90 deg and sharply peaked in the forward and backward directions. At all energies there was some excess of particles in the forward direction and-at high energies the distributions were predominantly forward peaked. Most of the particles were believed to be evaporated from compound nuclei with angular distributions determined by the high angular momenta of the emitting systems. The angular distributions could be fitted by a theory with a single adjustable parameter that was related to the variation of level density with angular momentum and the incoming and outgoing angular momenta. The total cross section for alpha - particle production was 2.6 plus or minus 0.6 barns and for protons 4.0 plus or minus 1.0 barns. These cross sections were larger than the estimated cross section for compound nucleus formation, indicating that sev eral charged particles are evaporated per interaction. About half the collision cross section is believed to result in compound nucleus formation. (auth)
Research Organization:
Yale Univ., New Haven
NSA Number:
NSA-15-006830
OSTI ID:
4125516
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ALPHA PARTICLES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CHARGED PARTICLES
COMPOUND NUCLEI
CROSS SECTIONS
EMISSION
ENERGY
EVAPORATION
EXCITATION
IONS
IRRADIATION
MEASURED VALUES
MOMENTUM
NICKEL
NUCLEI
OXYGEN
PHYSICS
PROTONS
REACTION KINETICS
SPECTRA