Two-phonon states in doubly even nuclei with 30 ≦ Z ≦ 52
197421 pages
Published in:
- Nucl.Phys.A 231 (1974) 120-140
- Published: 1974
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Abstract: (Elsevier)
Results of a survey of energies of two-phonon states are presented. Systematic trends are extracted and parametrized with the anharmonic vibrator model. The doubly even nuclei with anomalous 0 + first excited states are fitted into a general pattern indicating profound influence of both proton and neutron shell closure on the lowering of the 0 +' state energies. A sharp transition from anharmonic vibrational to almost pure rotational motion in this nuclear region is suggested for nuclei with first excited 2 + state energy ≈ 130 keV. Such a possible transition and similar ones already well known in the rare earth and heavy element regions are well described by the model.References(18)
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