Elsevier

Nuclear Physics A

Volume 535, Issues 3–4, December 1991, Pages 669-700
Nuclear Physics A

Interplay between single-particle and collective degrees of freedom in the excitation of the low-lying states in 142Nd

https://doi.org/10.1016/0375-9474(91)90482-LGet rights and content

Abstract

The low-lying excited states in 142Nd were investigated by inelastic electron scattering. The momentum transfer range covered was 0.5–2.8 fm−1. Transition charge densities were extracted for natural-parity states from 0+ up to 9 and up to an excitation energy of 3.5 MeV. For several new excited states spin and parity assignments have been suggested. The experimental transition charge densities have been interpreted with the aid of the quasiparticle-phonon model (QPM). The QPM is well-suited to investigate the contribution of collective and single-particle degrees of freedom to excited states in spherical nuclei. On the basis of the QPM calculations it is shown that in 142Nd both degrees of freedom play an important role, as well as the interplay between them. Both the strength distribution and the structure of the transition charge densities of the low-lying excited states are well described by the calculations. The origin of the structure in the nuclear interior usually predicted by microscopic calculations but not observed experimentally is explained. An argument for the proton number dependence of the excitation energy of the 31 state in the N = 82 isotones is given.

References (41)

  • L. Trache et al.

    Nucl. Phys.

    (1989)
  • H.H. Pitz et al.

    Nucl. Phys.

    (1990)
  • R.K.J. Sandor et al.

    Phys. Lett.

    (1989)
  • C. de Vries et al.

    Nucl. Instr. Meth.

    (1984)
  • J.H.J. Distelbrink et al.

    Nucl. Instr. Meth.

    (1984)
  • H. Blok et al.

    Nucl. Instr. Meth.

    (1987)
  • H. Rothhaas et al.

    Phys. Lett.

    (1974)
  • I. Sick

    Phys. Lett.

    (1982)
  • S. Galès et al.

    Phys. Reports

    (1988)
  • V.G. Soloviev

    Progr. Part. Nucl. Phys.

    (1987)
  • G.G. Simon et al.

    Nucl. Phys.

    (1980)
  • V.Yu. Ponomarev et al.

    Nucl. Phys.

    (1979)
  • L.K. Peker

    Nucl. Data Sheets

    (1984)
  • J.H. Heisenberg et al.

    Nucl. Phys.

    (1971)
  • J.B. Ball et al.

    Phys. Lett.

    (1969)
  • J. Tenenbaum et al.

    Nucl. Phys.

    (1974)
  • V. Meot
  • X.-H. Phan et al.

    Phys. Rev.

    (1988)
  • W.Y. Kim, private communication...
  • O. Schwentker et al.

    Phys. Rev. Lett.

    (1983)
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