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Title: The (3He,tf) as a surrogate reaction to determine (n,f) cross sections in the 10 to 20 MeV energy range

The surrogate reaction 238U(3He,tf) is used to determine the 237Np(n,f) cross section indirectly over an equivalent neutron energy range from 10 to 20 MeV. A self-supporting ~;;761 mu g/cm2 metallic 238U foil was bombarded with a 42 MeV 3He2+ beam from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory (LBNL). Outgoing charged particles and fission fragments were identified using the Silicon Telescope Array for Reaction Studies (STARS), consists of two 140 mu m and one 1000 mu m Micron S2 type silicon detectors. The 237Np(n,f) cross sections, determined indirectly, were compared with the 237Np(n,f) cross section data from direct measurements, the Evaluated Nuclear Data File (ENDF/B-VII.0), and the Japanese Evaluated Nuclear Data Library (JENDL 3.3) and found to closely follow those datasets. Use of the (3He,tf) reaction as a surrogate to extract (n,f) cross section in the 10 to 20 MeV equivalent neutron energy is found to be suitable.
Authors:
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Publication Date:
OSTI Identifier:
1000352
Report Number(s):
LBNL-4048E
TRN: US1008219
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research B; Journal Volume: 267; Journal Issue: 11; Related Information: Journal Publication Date: 6/1/2009
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Nuclear Science Division
Country of Publication:
United States
Language:
English
Subject:
73; CHARGED PARTICLES; CROSS SECTIONS; CYCLOTRONS; ENERGY RANGE; FISSION FRAGMENTS; NEUTRONS; NUCLEAR DATA COLLECTIONS; SILICON; STARS; TELESCOPES Indirect method; Cross section; Surrogate technique; Charge-exchange reaction