PROMPT NEUTRONS FROM FISSION

Journal Article · Tue Oct 01 00:00:00 EDT 1963 · Nuclear Physics (Netherlands) Divided into Nucl. Phys. A and Nucl. Phys. B

DOI:https://doi.org/10.1016/0029-5582(63)90182-2· OSTI ID:4124799

Hopkins, J. C.; Diven, B. C.

An absolute measurement of nu , the average number of neutrons emitted per fission, was made for the spontaneous fission of Cf/sup 252/. This number is 3.771 plus or minus 0.031 prompt neutrons per fission. Measurements of nu for the spontaneous fission of Pu/sup 240/ and for neutron induced fission of U/ sup 233/, U/sup 235/ and Pu/sup 239/ were made relative to the spontaneous fission nu of Cf/sup 252/. Several incident neutron energies between zero and 14.5 Mev were used. A universal nu versus incident neutron energy curve for U/ sup 233/, U/sup 235/, and Pu/sup 239/, was constructed by adding a constant energy to the incident neutron energy for each nucleide. The constants for U/sup 233/, U/sup 235/, and Pu/sup 239/ were 0.46, 0, and 3.3 Mev, respectively. The data can be fitted with two straight lines of slopes 0.085 neutrons per Mev up to about 1.6 Mev and 0.16 neutrons per Mev above 1.6 Mev. At thermal energy the nu value is 2.412 prompt neutrons per fission. (auth)

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• NSA Number: NSA-18-006213
• OSTI ID: 4124799
• Report Number(s): LADC-5578; 0029-5582
• Journal Information: Nuclear Physics (Netherlands) Divided into Nucl. Phys. A and Nucl. Phys. B, Vol. Vol: 48; Other Information: LADC-5578. Orig. Receipt Date: 31-DEC-64
• Country of Publication: United States
• Language: English

Related Subjects

PHYSICS
CALIFORNIUM 252
FISSION
MEASURED VALUES
PLUTONIUM 239
PLUTONIUM 240
PROMPT NEUTRONS
THERMAL NEUTRONS
URANIUM 233
URANIUM 235