/sup 235/U fission cross section measurements relative to neutron--proton scattering. [0. 8 to 20 MeV]

Conference · Wed Oct 01 04:00:00 EDT 1975 · Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States)

OSTI ID:7275648

Sidhu, G S; Czirr, J B

Energy dependence of the fission cross section of /sup 235/U with respect to the n-p scattering reaction was measured for neutron energies from 0.8 to 20 MeV. The LLL linac target was used as the pulsed neutron source; neutron energies were measured by time-of-flight technique. A /sup 235/U ion chamber was designed and operated to make the fission detection efficiency independent of the angular distribution of fission fragments. The neutron flux monitor consisted of an annular polyethylene radiator with a shielded proton recoil detector. Data in the energy range from 3 to 30 MeV were obtained with a 3.3 mg/cm/sup 2/ radiator; a 0.31 mg/cm/sup 2/ radiator was used for the range from 0.8 to 4 MeV. Both sets of data were normalized to yield the average fission cross section value of 1.198 b in the overlapping region from 3 to 4 MeV. Total error in the relative /sup 235/U(n,f) cross section is +-1 percent below 7 MeV, +-2 percent at 14 MeV, and +-6 percent at 20 MeV. 5 figures, 1 table. (auth)

• Research Organization: Univ. of California, Livermore
• OSTI ID: 7275648
• Conference Information: Journal Name: Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States) Journal Volume: 425
• Country of Publication: United States
• Language: English

Related Subjects

652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CROSS SECTIONS
ENERGY DEPENDENCE
ENERGY RANGE
FISSION
HADRON REACTIONS
KEV RANGE
KEV RANGE 100-1000
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
TARGETS
URANIUM 235 TARGET