Measurement of the normalized U 238 (n,f)/ U 235 (n,f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber

NIFFTE Collaboration

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The normalized U238(n,f)/U235(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber (fissionTPC) from the reaction threshold to 30MeV. 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 U238(n,f)/U235(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 U238(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.

Original languageEnglish
Article number034618
JournalPhysical Review C
Volume97
Issue number3
DOIs
StatePublished - Mar 23 2018
Externally publishedYes

Funding

The authors would like to thank Caleb Mattoon for valuable discussions. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. The neutron beam for this work was provided by LANSCE, which is funded by the U.S. Department of Energy and operated by Los Alamos National Security, LLC, under Contract No. DE-AC52-06NA25396. University collaborators acknowledge support for this work from the U.S. Department of Energy Nuclear Energy Research Initiative Project No. 08-014, the U.S. Department of Energy Idaho National Laboratory operated by Battle Energy Alliance under Contract No. 00043028-00116, the DOE-NNSA Stewardship Science Academic Alliances Program, under Grant No. DE-NA0002921, and through subcontracts from LLNL and LANL. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. The neutron beam for this work was provided by LANSCE, which is funded by the U.S. Department of Energy and operated by Los Alamos National Security, LLC, under Contract No. DE-AC52-06NA25396. University collaborators acknowledge support for this work from the U.S. Department of Energy Nuclear Energy Research Initiative Project No. 08-014, the U.S. Department of Energy Idaho National Laboratory operated by Battle Energy Alliance under Contract No. 00043028-00116, the DOE-NNSA Stewardship Science Academic Alliances Program, under Grant No. DE-NA0002921, and through subcontracts from LLNL and LANL.

Fingerprint

Dive into the research topics of 'Measurement of the normalized U 238 (n,f)/ U 235 (n,f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber'. Together they form a unique fingerprint.

Cite this