Origin of the narrow, single peak in the fission-fragment mass distribution for Fm258

Takatoshi Ichikawa, Akira Iwamoto, and Peter Möller
Phys. Rev. C 79, 014305 – Published 15 January 2009

Abstract

We discuss the origin of the narrowness of the single peak at mass-symmetric division in the fragment mass-yield curve for spontaneous fission of Fm258. For this purpose, we employ the macroscopic-microscopic model and calculate a potential-energy curve at the mass-symmetric compact scission configuration, as a function of the fragment mass number, which is obtained from the single-particle wave-function densities. In the calculations, we minimize total energies by varying the deformations of the two fragments, with constraints on the mass quadrupole moment, and by keeping the neck radius zero. The energies thus become functions of mass asymmetry. Using the obtained potential, we solve the one-dimensional Schrödinger equation with a microscopic coordinate-dependent inertial mass to calculate the fragment mass-yield curve. The calculated mass yield, expressed in terms of the microscopic mass density, is consistent with the extremely narrow experimental mass distribution.

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  • Received 28 October 2008

DOI:https://doi.org/10.1103/PhysRevC.79.014305

©2009 American Physical Society

Authors & Affiliations

Takatoshi Ichikawa1, Akira Iwamoto2, and Peter Möller3

  • 1RIKEN Nishina Center, RIKEN, Wako, Saitama 351-0198, Japan
  • 2Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
  • 3Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 79, Iss. 1 — January 2009

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