Evidence for Decreased Pairing Energies in Odd-<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>N</mi></math></span> Nuclei from Band-Crossing Frequencies

J. D. Garrett; O. Andersen; J. J. Gaardhøje; G. B. Hagemann; B. Herskind; J. Kownacki; J. C. Lisle; L. L. Riedinger; W. Walús; N. Roy; S. Jönsson; H. Ryde; M. Guttormsen; P. O. Tjøm

doi:10.1103/PhysRevLett.47.75

Evidence for Decreased Pairing Energies in Odd- $N$ Nuclei from Band-Crossing Frequencies

J. D. Garrett, O. Andersen, J. J. Gaardhøje, G. B. Hagemann, B. Herskind, J. Kownacki, J. C. Lisle, L. L. Riedinger, W. Walús, N. Roy, S. Jönsson, H. Ryde, M. Guttormsen, and P. O. Tjøm

Phys. Rev. Lett. 47, 75 – Published 13 July 1981

Abstract

An odd-even neutron-number dependence of the alignment frequency of the first pair of $i_{\frac{13}{2}}$ quasineutrons in rare-earth nuclei is established. This effect is explained by a reduction of the neutron pairing-correlation parameter $Δ_{n}$ for odd- $N$ systems as compared to seniority-zero configurations in even- $N$ nuclei.

Received 23 March 1981

DOI:https://doi.org/10.1103/PhysRevLett.47.75

Authors & Affiliations

J. D. Garrett, O. Andersen, J. J. Gaardhøje, G. B. Hagemann, B. Herskind, J. Kownacki^*, J. C. Lisle^†, and L. L. Riedinger^‡

The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark

W. Walús^§, N. Roy, S. Jönsson, and H. Ryde

Department of Physics, University of Lund, S-223 Lund, Sweden

M. Guttormsen and P. O. Tjøm

Institute of Physics, University of Oslo, N-1000 Oslo, Norway

^*Permanent address: Institute of Nuclear Research, 05-400 Swierk, Poland.
^†Permanent address: Department of Physics, University of Manchester, Manchester M13 9PL, United Kingdom.
^‡Permanent address: Department of Physics, University of Tennessee, Knoxville, Tenn. 37916.
^§Permanent address: Jagellonian University, 30-059 Cracow, Poland.