Elsevier

Nuclear Physics A

Volume 285, Issue 1, 18 July 1977, Pages 32-44
Nuclear Physics A

Study of some characteristics of the thermal-neutron-induced sub-barrier fission of 231Pa, 232Th and 237Np

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Abstract

Some characteristics of the thermal-neutron-induced fission of 231Pa, 232Th and 237Np were studied using a highly pure thermal-neutron beam of the Grenoble High Flux Reactor. For the thermal-neutron-induced-fission cross section we obtained 20 ± 4 mb for 237Np, 19 ± 4 mb for 231Pa and less than 2.5 μb for 232Th, in agreement with calculations based on a double humped fission barrier. We also determined a mean total fission fragment kinetic energy of 172.8 + 2.5 MeV for 237Np, which fits into the semi-empirical systematic of ĒK versus Z2/Acase13. Finally, we determined LRA/B ratios of (1.94±0.17) × 10−3 for 237Np and (1.67±0.11) × 10−3for 231Pa, in disagreement with the theoretical predictions of Feather, but consistent with the semi-empirical systematic of Halpern.

References (25)

  • C. Wagemans et al.

    Nucl. Phys.

    (1976)
  • A. Deruytter et al.

    J. Nucl. Energ.

    (1973)
  • P. del Marmol et al.

    J. Inorg. Nucl. Chem.

    (1973)
  • V. Strutinsky et al.

    Nucl. Phys.

    (1963)
  • N. Feather
  • J. Unik et al.
  • I. Halpern

    Ann. Rev. Nucl. Sci.

    (1971)
  • S. Raman et al.
  • V. Uotinen et al.
  • A. Ghiorso et al.

    TID 5223 II

    (1952)
  • A. Ghiorso et al.
  • C. Wagemans et al.

    Report BLG 514

    (1976)

    • Cited by (0)

    †

    Nationaal Fonds voor Wetenschappelijk Onderzoek.

    ††

    Interuniversitair Instituut voor Kernwetenschappen.

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