SEDL / STP / STP1228-EB / STP15166S

Measurements of the ²³⁷Np(n,f) Cross Section

Carlson, AD
staff physicist, National Institute of Standards and Technology, Gaithersburg,MD

Parker, WE
Post Doctoral appointee, Lawrence Livermore National Laboratory, CA

Lisowski, PW
Staff physicists, Los Alamos National Laboratory, Los Alamos,NM

Morgan, GL
Staff physicists, Los Alamos National Laboratory, Los Alamos,NM

Seestrom, SJ
Staff physicists, Los Alamos National Laboratory, Los Alamos,NM

Hill, NW
Retiree, Oak Ridge National Laboratory, Oak Ridge,TN

Meggers, K
Graduate student, University of Kiel, Geesthacht,

Pages: 7    Published: Jan 1994

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Source: STP1228-EB

Abstract

Measurements have been made of the neutron induced fission cross section of ²³⁷Np(n,f) at the Los Alamos Neutron Scattering Center utilizing a white neutron source and a fast parallel multiplate ionization chamber. The ¹⁰B(n,α) standard cross section was used to establish the energy dependence of the neutron fluence and a very accurately known fission resonance integral for ²³⁵U was used for normalization. The measurements in the resonance region, from 5 eV to 5 keV, indicate that the ENDF/B-VI values are too low by about a factor of three.

Keywords:
dosimetry, ENDF/B-VI, fission, LANSCE, 237, Np(n,f), neutron, resonance

Paper ID: STP15166S
Committee/Subcommittee: E10.01
DOI: 10.1520/STP15166S
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