Elsevier

Nuclear Physics A

Volume 507, Issue 1, 29 January 1990, Pages 129-140
Nuclear Physics A

Scissors and unique-parity modes of M1 excitation in deformed nuclei

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Abstract

The possible modes of M1 excitation in deformed even-even nuclei are studied in terms of M1 sum-rule states. The M1 strength and excitation energy are evaluated in terms of the particle-number-conserved Nilsson+BCS formalism, using the standard value of the parameters. The spurious motion with respect to the rotation is removed. In addition to the scissors mode, the unique-parity spin mode and the normal-parity spin mode are suggested, although the latter may be fragmented to a large extent. The proton unique-parity (i.e. 0h112) mode for 164Dy is obtained around Ex⋍3 MeV with B(M1) ≈0.3 (μN2) in the sum rule limit. This is in good agreement to the recent experimental data. We thus suggest that there is more than one mode for the M1 excitation. The scissors mode carries most of the orbital strength, while the others, the spin strength. The entire M1 excitation schemes for 164Dy, 156Gd and 166Er are presented.

References (18)

  • D. Bohle

    Phys. Lett.

    (1984)
  • C. Wesselborg

    Phys. Lett.

    (1988)
  • I. Hamamoto

    Phys. Lett.

    (1984)
    I. Hamamoto

    Phys. Lett.

    (1987)
  • T. Otsuka

    Phys. Lett.

    (1978)
    T. Otsuka

    Nucl. Phys.

    (1978)
  • F. Iachello

    Nucl. Phys.

    (1981)
  • A.E.L. Dieperink

    Prog. Part. Nucl. Phys.

    (1983)
  • A. Bohr et al.
  • O. Civitarese

    Phys. Rev.

    (1987)
  • A. Richter
There are more references available in the full text version of this article.

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