SYMPOSIA PAPER Published: 01 January 1994

Measurements of the Np(n,f) Cross Section


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.

Author Information

Carlson, AD
National Institute of Standards and Technology, Gaithersburg, MD
Parker, WE
Lawrence Livermore National Laboratory, CA
Lisowski, PW
Los Alamos National Laboratory, Los Alamos, NM
Morgan, GL
Los Alamos National Laboratory, Los Alamos, NM
Seestrom, SJ
Los Alamos National Laboratory, Los Alamos, NM
Hill, NW
Oak Ridge National Laboratory, Oak Ridge, TN
Meggers, K
University of Kiel, Geesthacht, Germany
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Developed by Committee: E10
Pages: 704–710
DOI: 10.1520/STP15166S
ISBN-EB: 978-0-8031-5281-6
ISBN-13: 978-0-8031-1899-7