RADIOCHEMICAL STUDIES OF THE FAST NEUTRON FISSION OF U$sup 235$ AND U$sup 238$

Conference · Sun Jun 01 04:00:00 EDT 1958

OSTI ID:4304611

Bunney, L R; Scadden, E M; Abriam, J O; Ballou, N E

Radiochemical studies of the fast neutron fission of U/sup 235/ and U/sup 238/ have been made in the mass region beyond mass 143 with two neutron energy distributions. These studies provide measurements of the relative fission yields of several chains in the rare earth group in fission of U/sup 235/ and U/sup 238/ caused by neutrons with an energy distribution very close to unmoderated fission neutrons and by neutrons with an energy distribution peaked at 8 Mev. The increased contribution of very asymmetric modes of fission as the energy of the compound nucleus is increased is clearly shown by the results. In the fission of U/sup 238/ the yield at mass 161 is increased 2.9 times at the higher neutron energy. No previous measurements have been published on radiochemical studies of the fission of U/sup 238/at these neutron energies beyond mass 144 except at mass 156 for the lower neutron energy. (auth)

• Research Organization: Naval Radiological Defense Lab., San Francisco (United States)
• NSA Number: NSA-12-015179
• OSTI ID: 4304611
• Report Number(s): A/CONF.15/P/643
• Country of Publication: United States
• Language: English

Related Subjects

DISTRIBUTION
ENERGY
ENERGY RANGE
FAST NEUTRONS
FISSION
FISSION PRODUCTS
FISSION YIELD
MASS
MEASURED VALUES
MODERATORS
NUCLEAR STRUCTURE
PHYSICS
RADIOCHEMISTRY
RARE EARTHS
URANIUM 235
URANIUM 238