Elsevier

Nuclear Physics A

Volume 388, Issue 3, 1 November 1982, Pages 452-476
Nuclear Physics A

The breaking of intrinsic reflection symmetry in nuclear ground states

https://doi.org/10.1016/0375-9474(82)90471-7Get rights and content

Abstract

Negative-parity excited states of doubly even nuclei have earlier been attributed to vibrational excitations. This paper shows that an interpretation starting from a reflection asymmetric intrinsic state is more appropriate for certain nuclei in the radium region. Theoretical evidence for stable octupole deformation comes from a deformed shell-model calculation in which we use a single-particle potential with a realistic radial shape and a finite-range interaction for the surface energy. The octupole effect systematically improves the agreement between theoretical and experimental masses. The low-lying O+ excitations observed in experiment are compatible with the calculated collective octupole potentials. The possibility of obtaining further evidence from the spectroscopy of odd-mass nuclei is considered in an exactly solvable model, which shows that the smaller energy splitting observed in odd-A parity doublets mainly reflects single-particle fragmentation of the collective mode. The systematics of theoretical shell structure and experimental spectroscopy suggests the presence of other regions of octupole collectivity near the limits of stability.

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    Work completed at the present address: UNISOR, Oak Ridge Associated Universities, Oak Ridge, Tennessee, with partial support from DOE under contract DE-Ac05-760R 00033.

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