Integral test of cross sections using neutron leakage spectra from spheres of iron, niobium, beryllium, and polyethylene

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

OSTI ID:7364968

Johnson, R H; Dorning, J J; Wehring, B W

Measurements of neutron leakage spectra in the energy range 1 to 15 MeV from homogeneous spherical assemblies have been made using an NE-213 spectrometry system. These benchmark-type measured spectra will be compared with detailed computed spectra as an integral test of evaluated nuclear data. Preliminary ANISN calculations using cross section sets based on ENDF/B-III are presented and compared with the measurements. Measurements on a 22-cm diam beryllium sphere, a 25-cm diam niobium sphere, and a 46-cm diam polyethylene (CH/sub 2/) sphere, each with a /sup 252/Cf source at the sphere center, have been made. The niobium calculation slightly underpredicts the leakage spectrum below 9 MeV. The beryllium and polyethylene calculations are in general agreement with the measurements, though discrepancies are seen for small energy ranges. Measurements have also been made for a 76-cm diam iron sphere with a 14-MeV source at the sphere center. The preliminary iron calculation (ENDF/B-III) greatly underpredicts the leakage spectrum from 1 to 8 MeV. 5 figures. (auth)

• Research Organization: Univ. of Illinois, Urbana
• OSTI ID: 7364968
• Conference Information: Journal Name: Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States) Journal Volume: 1
• Country of Publication: United States
• Language: English

Related Subjects

654003* -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALINE EARTH METALS
BERYLLIUM
CALIFORNIUM 242
CALIFORNIUM ISOTOPES
CROSS SECTIONS
ELEMENTS
EVEN-EVEN NUCLEI
HEAVY NUCLEI
IRON
METALS
NEUTRON LEAKAGE
NIOBIUM
NUCLEI
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
REFRACTORY METALS
SPHERES
TRANSITION ELEMENTS