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NEUTRON CROSS SECTION MEASUREMENTS AT WNR+
P. W. LIsnwsM, G. F. Auc^nauah,
M. S. woore, G. L. Moraan. and R. E. Shamu*
Los Alamos Scientific Laboratory
Los Alamos, New Mexico 87F45, U.S.A.
ABSTRACT
The Weapons Neutron Research Facility has been used
to obtain moderate-resolution total neutron cross section
data for H, C, 2QPPb', 232jh, 238u, and ?42pu over
the eneroy range 5 to 200 MeV. Neutrons were produced by
bomhardino a 2.5-cm diam by 15-cm lone Ta target with an
POO MeV pulsed proton beam from LAMPF. A 10.2-cm diam by
15.2-cm thick NE110 proton recoil detector was used at a
flight path of 32 meters, givina a time-of-flight resolu-
tion of 60 ps/m. The total cross section results are
compared to ENDF/BV evaluations and to previous data
where possible.
INTRODUCTION
The Weapons Neutron Research Facility (WNP) has recently be-
come operational as a pulsed white-neutron source [1]. At WNR, a
portion of the 800-MeV proton beam from the Los Alamos Meson
Physics facility (LAMPF) 1s used to produce neutrons by spalla-
tion reactions on various heavy-metal targets. Proton pulses of
variable width may be provided along with suitable targets and
moderators to give a t1me-of-f1ight capability covering the
energy range from a few meV to several hundred MeV.
Of Interest to this conference 1s the fact that the neutron
flux at WNR Is particularly suited for measurements In the 10- to
50-MeV energy range. This 1s because there 1s significantly more
neutron Intensity at WNR 1n that energy range than at any other
white-source facility and because the y-ray burst 1s many or-
ders of magnitude smaller than at an electron machine, permitting
data to be obtained nearly up to time t ■ 0.
+ Work supported by the U. S. Department of Energy
* Western Michigan University, Kalamazoo, Michigan
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Lisowski, P. W.; Archampaugh, G. F.; Moore, M. S.; Morgan, G. L. & Shamu, R. E. Neutron cross section measurements at WNR, article, January 1, 1980; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1072318/m1/2/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.