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Eight-dimensional calculations of the third barrier in 232Th

P. Jachimowicz

M. Kowal* and J. Skalski

  • Institute of Physics, University of Zielona Góra, Szafrana 4a, 65516 Zielona Góra, Poland

  • National Centre for Nuclear Research, Hoża 69, PL-00-681 Warsaw, Poland

  • *m.kowal@fuw.edu.pl
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Phys. Rev. C 87, 044308 – Published 8 April, 2013

DOI: https://doi.org/10.1103/PhysRevC.87.044308

Abstract

We find the height of the third fission barrier BIII and energy of the third minimum EIII in 232Th using the macroscopic-microscopic model, which is very well tested in this region of nuclei. For the first time it is done on an eight-dimensional deformation hypercube. The dipole distortion is included among the shape variables to ensure that no important shapes are missed. The saddle point is found on a lattice containing more than 50×106 points by the immersion water flow method. The shallow third minimum, BIII−EIII≈0.36 MeV, agrees with the experimental data of Blons et al. [Phys. Rev. Lett. 35, 1749 (1975)]. This is in sharp contrast with the status of the third minima in 232−236U: their experimental depth of ≥3 MeV contradicts all realistic theoretical predictions. We emphasize the importance of repeating the experiment on 232Th, by a technique similar to that used in the uranium nuclei, for settling the puzzle of the third minima in actinides.

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Phys. Rev. C 87, 044308– Published 8 April, 2013
  • Received 3 January 2013

©2013 American Physical Society

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