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Measurement of the normalized U238(n,f)/U235(n,f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber

Journal Article · · Physical Review C
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We present that the normalized 238U(n,f)/235U(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber (fissionTPC) from the reaction threshold to 30 MeV . The fissionTPC is a two-volume MICROMEGAS time projection chamber that allows for full three-dimensional reconstruction of fission-fragment ionization profiles from neutron-induced fission. The measurement was performed at the Los Alamos Neutron Science Center, where the neutron energy is determined from neutron time of-flight. The 238U(n,f)/235U(n,f) ratio reported here is the first cross section measurement made with the fissionTPC, and will provide new experimental data for evaluation of the 238U(n,f) cross section, an important standard used in neutron-flux measurements. Use of a development target in this work prevented the determination of an absolute normalization, to be addressed in future measurements. Instead, the measured cross section ratio has been normalized to ENDF/B-VIII.β5 at 14.5 MeV.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396; AC52-07NA27344; NA0002921
OSTI ID:
1432964
Alternate ID(s):
OSTI ID: 1429130
Report Number(s):
LLNL-JRNL-733744
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 3 Vol. 97; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Fission fragment angular anisotropy in neutron-induced fission of U 235 measured with a time projection chamber journal June 2019

Figures / Tables (22)

FIG. 1.(p. 5)figure FIG. 1.
FIG. 2.(p. 6)figure FIG. 2.
FIG. 3.(p. 6)figure FIG. 3.
FIG. 4.(p. 7)figure FIG. 4.
FIG. 5.(p. 7)figure FIG. 5.
FIG. 6.(p. 8)figure FIG. 6.
FIG. 7.(p. 8)figure FIG. 7.
FIG. 10.(p. 9)figure FIG. 10.
FIG. 8.(p. 9)figure FIG. 8.
FIG. 9.(p. 9)figure FIG. 9.
TABLE I(p. 9)table TABLE I
FIG. 11.(p. 10)figure FIG. 11.
FIG. 12.(p. 11)figure FIG. 12.
FIG. 13.(p. 12)figure FIG. 13.
FIG. 14.(p. 13)figure FIG. 14.
FIG. 15.(p. 13)figure FIG. 15.
TABLE II(p. 13)table TABLE II
FIG. 16.(p. 14)figure FIG. 16.
FIG. 17.(p. 15)figure FIG. 17.
FIG. 18.(p. 15)figure FIG. 18.
FIG. 19.(p. 16)figure FIG. 19.
FIG. 20.(p. 16)figure FIG. 20.

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS