Four-dimensional Langevin approach to low-energy nuclear fission of U236

Chikako Ishizuka, Mark D. Usang, Fedir A. Ivanyuk, Joachim A. Maruhn, Katsuhisa Nishio, and Satoshi Chiba
Phys. Rev. C 96, 064616 – Published 22 December 2017

Abstract

We developed a four-dimensional (4D) Langevin model, which can treat the deformation of each fragment independently and applied it to low-energy fission of U236, the compound system of the reaction n+U235. The potential energy is calculated with the deformed two-center Woods-Saxon (TCWS) and the Nilsson-type potential with the microscopic energy corrections following the Strutinsky method and BCS pairing. The transport coefficients are calculated by macroscopic prescriptions. It turned out that the deformation for the light and heavy fragments behaves differently, showing a sawtooth structure similar to that of the neutron multiplicities of the individual fragments ν(A). Furthermore, the measured total kinetic energy TKE(A) and its standard deviation are reproduced fairly well by the 4D Langevin model based on the TCWS potential in addition to the fission fragment mass distributions. The developed model allows a multiparametric correlation analysis among, e.g., the three key fission observables, mass, TKE, and neutron multiplicity, which should be essential to elucidate several longstanding open problems in fission such as the sharing of the excitation energy between the fragments.

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  • Received 2 June 2017
  • Revised 10 November 2017

DOI:https://doi.org/10.1103/PhysRevC.96.064616

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Chikako Ishizuka1,*, Mark D. Usang1,2, Fedir A. Ivanyuk1,3, Joachim A. Maruhn4, Katsuhisa Nishio5, and Satoshi Chiba1,6

  • 1Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2 chome-12-1 Ookayama, Meguro, Tokyo 152-8550, Japan
  • 2Reactor Technology Center, Technical Support Division, Malaysian Nuclear Agency, Bangi 43000, Kajang, Selangor Darul Ehsan, Malaysia
  • 3Institute for Nuclear Research, Prospect Nauki 47, Kiev 03028, Ukraine
  • 4Institute for Theoretical Physics, Goethe University, Max-von-Laue street 1, 60323 Frankfurt am Main, Germany
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Ooaza Shirakata 2-4, Tokai, Ibaraki 319-1195, Japan
  • 6Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8558, Japan

  • *chikako@lane.iir.titech.ac.jp

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Issue

Vol. 96, Iss. 6 — December 2017

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