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THE ANGULAR CORRELATION OF PROMPT NEUTRONS AND FISSION FRAGMENTS IN THERMAL NEUTRON FISSION OF U$sup 23$$sup 5$

Journal Article · · Nuclear Phys.
BS>The angular distributions of the prompt neutrons of specified mean energies emitted in the thermal neutron fission of U/sup 235/ are measured with respect to the direction of motion of light fragments. A combination of a gridded ionization chamber and a gas scintillation counter system using xenon gas is used to measure the energy of the fission fragments as well as their direction of motion relative to the electric field direction of the ionization chamber. A fast neutron detector is placed along the electric fielai direction to measure the energy of the prompt neutrons by time of flight technique. The distributions obtained are compared with the distributions computed on the assumption of isotropic emission of neutrons with a Maxwellian emission spectrum. It is shown that the laboratory anisotropy N(O deg )/N(9O deg ) is an increasing function of the neutron energy in the laboratory system. The laboratory angular distributions are transformed to obtain the center-of-mass angular distributions for two groups of prompt neutron emission energies. Anisotropy of the form (a + b cos/sup 2/ theta ) is indicated for prompt neutrons with emission energies greater than 1 Mev. Anisotropy of emission is discussed in terms of the possibility of the fragments acquiring a large angular momentum at the instant of scission. (auth)
Research Organization:
Atomic Energy Establishment, Trombay, India
NSA Number:
NSA-15-024336
OSTI ID:
4027173
Journal Information:
Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 25
Country of Publication:
Country unknown/Code not available
Language:
English

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