Elsevier

Nuclear Physics A

Volume 318, Issues 1–2, 16 April 1979, Pages 63-76
Nuclear Physics A

Fission properties of233Th

https://doi.org/10.1016/0375-9474(79)90470-6Get rights and content

Abstract

The fission fragment kinetic energy and mass distributions as a function of incident neutron energy were investigated for the232Th(n, f) reaction. The neutron energy range studied, from 1.35 to 5.30 MeV, includes the fission threshold region where some large structures in the fission cross section are observed, which are attributed to vibrational states in the second (or third) well of the fission barrier. The variation of the mean total kinetic energy of the primary fragments with incident neutron energy is consistent with the results of recent measurements of the variation of the mean number of prompt neutron emitted per fission. Two distinct behaviors are observed, depending upon whether or not the fission proceeds below the barrier (through vibrational states). Information concerning the fission fragment mass dependance of the fragment kinetic energy variation as a function of neutron energy, is also presented. A possible explanation of the results is given in terms of a near adiabatic behavior of the232Th(n, f) process. It is the first time that such a behavior is observed in the actinide region.

Reference (24)

  • SwiateckiW.J. et al.

    Phys. Reports

    (1972)
  • Lo NigroS. et al.

    Nucl. Phys.

    (1967)
  • CaruanaJ. et al.

    Nucl. Phys.

    (1977)
  • HolubarschW. et al.

    Nucl. Phys.

    (1971)
  • CaruanaJ. et al.

    Nucl. Phys.

    (1977)
  • MatherD.S. et al.

    Nucl. Phys.

    (1965)
  • HigbieJ.

    Nucl. Instr.

    (1970)
  • DaviesK.T.R. et al.

    Phys. Rev.

    (1976)
  • PauliH.C. et al.
  • LachkarJ. et al.

    J. de Phys.

    (1975)
  • KonecnyE. et al.
  • WeberJ. et al.

    Phys. Rev.

    (1976)
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    • Measurement of fission products yields in the quasi-mono-energetic neutron-induced fission of <sup>232</sup>Th

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      Similarly, the fission fragment yields data of neutron-deficient Th isotopes such as 220–229Th in the excitation energy range of the GDR region due to electromagnetic fission in inverse kinematics are available in Refs. [63–65]. From these data, it was observed that the yields of fission products are available in a wide range of neutron- [24–51] and bremsstrahlung- [52–62] induced fissions of 232Th. However, the fission product yields data within neutron energies of 8 to 14.8 MeV are available in limited way except our data at the neutron energies of 6.35, 8.53 and 10.09 MeV [50].

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      In the literature, some data are available in the reactor neutron-induced fission of 232Th [21,22] and 238U [23,24]. However, fission yield data for various other mono-energetic neutron-induced fissions of 232Th [25–48] and 238U [48–73] are available in literature. On the other hand, yields of fission fragments in the excitation energy range of the GDR region due to electromagnetic fission in inverse kinematics [74–76] are available for neutron-deficient lighter actinides such as 220–229Th and 231–234U.

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