Total kinetic energy release in the fast-neutron-induced fission of Np237

Pica, A.; Chemey, A. T.; Yao, L.; Loveland, W.; Lee, H. Y.; Kuvin, S. A.

doi:10.1103/physrevc.102.064612

Total kinetic energy release in the fast-neutron-induced fission of Np 237

Journal Article · Fri Dec 11 00:00:00 EST 2020 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.102.064612· OSTI ID:1991557

^[1]; ^[2]; Yao, L. ^[2]; ^[2]; Lee, H. Y. ^[3]; ^[3]

Oregon State University, Corvallis, OR (United States); Oregon State University
Oregon State University, Corvallis, OR (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

The total kinetic energy (TKE) release in the fast neutron-induced fission of 237Np was measured for neutron energies from En = 2.6–100 MeV at the Los Alamos Neutron Science Center at the Weapons Neutron Research facility. The post-TKE release decreases nonlinearly with increasing incident neutron energy and can be represented as TKE(MeV) = (174.38 ± 0.72) – (5.11 ± 0.5821) log₁₀E_n for En > 1 MeV. Analysis of the fragment mass distributions indicates that the decrease in TKE with increasing E_n is a consequence of the fading out of shell effects at high excitation energies (resulting in an increase of symmetric fission) and the decrease of the total kinetic energy associated with asymmetric fission with increasing E_n.

View Accepted Manuscript (DOE)

Research Organization:: Oregon State University, Corvallis, OR (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0014380

OSTI ID:: 1991557

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 102; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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