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Direct measurement of prompt neutrons emitted in fission of /sup 226/Ra by 12 MeV protons

Journal Article · · Phys. Rev., C; (United States)
;
Prompt neutron energy distributions were measured at 0/sup 0/ and 90/sup 0/ with respect to the fission axis,,in corelation with the mass-energy distribution of the fragments, for the fission of /sup 226/Ra induced by 12 MeV protons. The average number and average kinetic energy of prefission neutrons were obtained as a function of fragment mass and total kinetic energy. The average number of prefission neutrons emitted is 0.33 +- 0.15 n/fission (this includes also contributions from scission neutrons). By comparing this result with calculations of the average number of ''true'' prefission neutrons, it was found that the number of true prefission neutrons is zero. The average number of postfission neutrons emitted from both fragments is 3.20 +- 0.20 with an average kinetic energy of 1.33 +- 0.07 MeV. The dependence of the number of postfission neutrons on the fragment mass can be interpreted as a combination of a sawtooth structure for the asymmetric mass division and a linearly increasing function for the symmetric mass division.
Research Organization:
Weizmann Institute of Science, Rehovot, Israel
OSTI ID:
7281001
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 16:3; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
ENERGY SPECTRA
FERMIONS
FISSION
FISSION FRAGMENTS
FISSION NEUTRONS
HADRON REACTIONS
HADRONS
KINETIC ENERGY
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
PROMPT NEUTRONS
PROTON REACTIONS
RADIUM 226 TARGET
SPECTRA
TARGETS