Measurement of the energy and multiplicity distributions of neutrons from the photofission of $^{235}\mathrm{U}$

Measurement of the energy and multiplicity distributions of neutrons from the photofission of ${}^{235}U$

S. D. Clarke, B. M. Wieger, A. Enqvist, R. Vogt, J. Randrup, R. C. Haight, H. Y. Lee, B. A. Perdue, E. Kwan, C. Y. Wu, R. A. Henderson, and S. A. Pozzi

Phys. Rev. C 95, 064612 – Published 20 June 2017

Abstract

For the first time, the complete neutron multiplicity distribution has been measured from the photofission of ${}^{235}U$ induced by high-energy spallation $γ$ rays arriving ahead of the neutron beam at the Los Alamos Neutron Science Center. The resulting average neutron multiplicity $3.80 \pm 0.08$ (stat.) neutrons per photofission is in general agreement with previous measurements. In addition, unique measurements of the prompt fission energy spectrum of the neutrons from photofission and the angular correlation of two-neutron energies emitted in photofission also were made. The results are compared to calculations with the complete event fission model freya.

Received 8 February 2017

DOI:https://doi.org/10.1103/PhysRevC.95.064612

Physics Subject Headings (PhySH)

Fission Neutron physics Nucleon induced nuclear reactions

A ≥ 220

Nuclear Physics

Authors & Affiliations

S. D. Clarke¹, B. M. Wieger¹, A. Enqvist², R. Vogt^3,4, J. Randrup⁵, R. C. Haight⁶, H. Y. Lee⁶, B. A. Perdue⁶, E. Kwan⁷, C. Y. Wu³, R. A. Henderson³, and S. A. Pozzi¹

¹Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
²Materials Science and Engineering, University of Florida, Gainesville, Florida 32661, USA
³Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
⁴Department of Physics, University of California at Davis, Davis, California 95616, USA
⁵Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁶Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁷National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA

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Vol. 95, Iss. 6 — June 2017

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Physical Review C

covering nuclear physics

Measurement of the energy and multiplicity distributions of neutrons from the photofission of ${}^{235}U$

S. D. Clarke, B. M. Wieger, A. Enqvist, R. Vogt, J. Randrup, R. C. Haight, H. Y. Lee, B. A. Perdue, E. Kwan, C. Y. Wu, R. A. Henderson, and S. A. Pozzi

Phys. Rev. C 95, 064612 – Published 20 June 2017

Abstract

Physics Subject Headings (PhySH)

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Physical Review C

covering nuclear physics

Measurement of the energy and multiplicity distributions of neutrons from the photofission of U235

S. D. Clarke, B. M. Wieger, A. Enqvist, R. Vogt, J. Randrup, R. C. Haight, H. Y. Lee, B. A. Perdue, E. Kwan, C. Y. Wu, R. A. Henderson, and S. A. Pozzi

Phys. Rev. C 95, 064612 – Published 20 June 2017

Abstract

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Measurement of the energy and multiplicity distributions of neutrons from the photofission of ${}^{235}U$