Elsevier

Nuclear Physics A

Volume 510, Issue 3, 16 April 1990, Pages 441-465
Nuclear Physics A

Deep proton-hole states in 147Pr, 151Pm and 155Eu

https://doi.org/10.1016/0375-9474(90)90061-PGet rights and content

Abstract

The inner hole states of 151Pm and 155Eu have been studied by means of (t, α) reactions at the triton incident energy of 35.32 MeV and of 147Pr at 35.32 MeV and 37.32 MeV. The results are interpreted in terms of the deformed shell model using the realistic Woods-Saxon potential. The influence of the hexadecapole deformation on the proton single-particle energies and the deduced pairing gap parameters are discussed. The total exhaustion of the l = 4 strength available in the excitation energy range covered by the bumps, corresponding to the inner proton-hole states, is suggested from consideration of the relative cross sections for transitions characterized by the l = 4 angular momentum transfer. The relative locations of the bumps for the three nuclei is found to be consistent with the predictions of the deformed shell model. However, the inclusion of the hexadecapole deformation results in a pairing gap parameter larger by a factor of two than that obtained without higher-order deformation. The difference in the energy spectra of 151Pm and 155Eu cannot be satisfactorily explained on the grounds of the deformed shell model alone. This, together with the observed discrepancy between the total strength distributions for these two nuclei, may suggest that the vibrational properties of the corresponding nuclei need to be considered.

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