ANGULAR DISTRIBUTIONS IN FISSION INDUCED BY ALPHA PARTICLES, DEUTERONS, AND PROTONS

Journal Article · Wed Oct 15 04:00:00 EDT 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.112.536· OSTI ID:4267965

Coffin, C T; Halpern, I

Pmtons of 11 Mev, deuterons of energies up to 22 Mev, and alpha particles of energies up to 43 Mev were used to study fission fragment angular distributions in the following targets: Bi/sup 209/, Ra/sup 226/, Th/sup 232/ U/ sup 238/, U/sup 235/, Np/sup 237/, and Pu/sup 239/. All of the measured distributions were qualitively similar in that more fragments were emitted forward and backward along the beam direction than sideways. The largest ratios of 0 to 90 differential cross sections were slightly greater than 2 and were obtained in tbe alpha-particle bombardments. The smallest ratios occurred in the proton bombardments. If one decomposes the fissions observed at a given bombarding energy into symmetric and asymmetric mass components, the anisotropy for each component decreases smoothly as the value of Z/sup 2//A of the compound nucleus increases. The asymmetric anisotropies are larger than the symmetric ones. There is no observable effect of the value of the target spin on the observed anisotropies. It is pointed out that some of the observed features of the anisotropies may be accounted for in terms of the fact that some of the fissions cccur only after the evaporation of neutrons. (auth) 2~ Pmtons of 11 Mev, deuterons of energies up to 22 Mev, and alpha panticles of energies up to 43 Mev were used

• Research Organization: Univ. of Washington, Seattle
• NSA Number: NSA-13-002487
• OSTI ID: 4267965
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 112; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
ANGULAR DISTRIBUTION
ANISOTROPY
BEAMS
BISMUTH 209
CROSS SECTIONS
DEUTERON BEAMS
DEUTERONS
ENERGY
ENERGY RANGE
EVAPORATION
FISSION
MEASURED VALUES
NEPTUNIUM 237
NEUTRONS
NUCLEAR MODELS
PHYSICS AND MATHEMATICS
PLUTONIUM 239
PROTON BEAMS
PROTONS
RADIUM 226
SPIN
TARGETS
THORIUM 232
URANIUM 235
URANIUM 238