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Title: Integral cross section measurement of the U 235 ( n , n ' ) U 235 m reaction in a pulsed reactor

The integral measurement of the neutron inelastic cross section leading to the 26-minute half-life 235mU isomer in a fission-like neutron spectrum is presented. The experiment has been performed at a pulsed reactor, where the internal conversion decay of the isomer was measured using a dedicated electron detector after activation. The sample preparation, efficiency measurement, irradiation, radiochemistry purification, and isomer decay measurement will be presented. We determined the integral cross section for the ²³⁵U(n,n')235mU reaction to be 1.00±0.13b. This result supports an evaluation performed with TALYS-1.4 code with respect to the isomer excitation as well as the total neutron inelastic scattering cross section.
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Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC52-06NA25396; AC52-07NA27344
Publisher's Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 4; Related Information: CHORUS Timestamp: 2015-05-12 09:48:53; Journal ID: ISSN 0556-2813
American Physical Society
Sponsoring Org:
Country of Publication:
United States