Elsevier

Nuclear Physics A

Volume 237, Issue 1, 6 January 1975, Pages 45-63
Nuclear Physics A

Spins of low-energy neutron resonances in 175Lu, 189Os and 187Os

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Abstract

Resonances up to 300 eV in 175Lu, 189Os, and 187Os are reported together with spin assignments and probabilities of correctness. Those spins reported with better than 90% confidence consist of 49, 17 and 10 resonances in 175Lu, 189Os, and 187Os respectively. In 187Os, 39 of the observed resonances have not been reported previously. Ratios of low-energy γ-ray intensities and γ-ray multiplicity were used for spin determinations. A method developed previously for analyzing these data has been extended to include analysis of uncertainties in relative populations, average reduced neutron widths, and strength functions of the two spin groups. The data in 189Os is consistent with a 20J+1 level-density dependence, but in the other two isotopes this rule is violated. We suggest spin cut-off factors of about 3 in this mass region. Small differences in <2n0 > and in the strength functions for the two spin groups are not considered very significant.

References (26)

  • C. Coceva et al.

    Nucl. Phys.

    (1968)
  • A.I. Namenson

    Nucl. Phys.

    (1973)
  • J. Julien et al.

    Phys. Lett.

    (1964)
  • T.F. Godlove et al.

    Nucl. Instr.

    (1971)
  • M.K. Balodis

    Nucl. Phys.

    (1972)
  • E. Bashandy et al.

    Nucl. Phys.

    (1966)
  • L.M. Bollinger
  • P. Giacobbe, M. Stefanon and G. Dellacasa, CNEN Technical Report RT/FI (68)...
  • J.R. Huizenga et al.

    Phys. Rev.

    (1960)
  • W.P. Poenitz

    Z. Phys.

    (1966)
  • W.P. Poenitz et al.

    Nucl. Phys.

    (1968)
  • K.J. Wetzel et al.

    Phys. Rev.

    (1970)
  • H. Feshbach

    Ann. Rev. Nucl. Sci.

    (1958)
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