Neutron induced fission cross sections for /sup 232/Th, /sup 235,238/U, /sup 237/Np and /sup 239/Pu from 1 to 400 MeV

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6445544

Lisowski, P W; Ullmann, J L; Balestrini, S J; Carlson, A D; Wasson, O A; Hill, N W

Neutron-induced fission cross section ratios for samples of /sup 232/Th, /sup 235,238/U, /sup 237/Np and /sup 239/Pu have been measured from 1 to 400 MeV. The fission reaction rate was determined for all samples simultaneously using a fast parallel plate ionization chamber at a 20-m flight path. A well characterized annular proton recoil telescope was used to measure the neutron fluence up to 30 MeV. These data provided the shape of the /sup 235/U(n,f) cross section relative to the hydrogen scattering cross section. That shape was then normalized to the very accurately known values were determined using the neutron fluence measured with a second proton recoil telescope. Cross section values for /sup 232/Th, /sup 238/U, /sup 237/Np, and /sup 239/Pu were computed from the ratio data using our values for /sup 235/U(n,f). In addition to providing new results at high neutron energies, these data resolve long standing discrepancies among different data sets. 1 ref., 1 fig.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6445544
• Report Number(s): LA-UR-88-3587; CONF-890406-7; ON: DE89002296
• Resource Relation: Conference: Fifty years with nuclear fission conference, Gaithersburg, MD, USA, 25 Apr 1989; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
THORIUM 232 TARGET
NEUTRON REACTIONS
URANIUM 235 TARGET
URANIUM 238 TARGET
CROSS SECTIONS
FISSION NEUTRONS
IONIZATION CHAMBERS
NEUTRON FLUENCE
BARYON REACTIONS
BARYONS
ELEMENTARY PARTICLES
FERMIONS
HADRON REACTIONS
HADRONS
MEASURING INSTRUMENTS
NEUTRONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
RADIATION DETECTORS
TARGETS
652020* - Nuclear Properties & Reactions
A=220 & above
Experimental