The Effect of Proton-Neutron Interactions on Energy Spectra of Nuclei of <I>A</I>\simeq120–145

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  • Yagi Kohsuke
    Department of Physics, Faculty of Science, Osaka University

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  • The effect of proton-neutron interactions on energy spectra of nuclei of A〓120-145
  • The effect of proton-neutron interactions on energy spectra of nuclei of A 120-145
  • The Effect of Proton-Neutron Interactions on Energy Spectra of Nuclei of<i>A</i>≃120–145

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The location of neutron-single hole states 2d3⁄2, 3s1⁄2, 1h11⁄2 and 2d5⁄2 in neutron magic N=82 nuclei 136Xe, 138Ba, 140Ce, 142Nd and 144Sm is studied on the basis of proton-neutron interactions. The observed variations of the neutron-single hole energies of 2d3⁄2, 1h11⁄2 and 2d5⁄2 states relative to that of the 3s1⁄2 state in going from 135Xe to 143Sm are reproduced fairly well by the use of an interaction Vpn=(V0+V1σp·σn)δ(rp−rn) and of harmonic oscillator wave functions. The proton configurations which have been obtained from proton-transfer reactions on these isotones are employed in the calculations. Also the dominant features of the neutron-state structures and the proton-state structures observed in N=82 isotones and Z=50 isotopes are discussed from the standpoint of the proton-neutron interactions.

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