Article,

Octupole collectivity in the Sm isotopes

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Phys. Rev. C, (December 2005)
DOI: 10.1103/PhysRevC.72.064302

Abstract

Microscopic models suggest the occurrence of strong octupole correlations in nuclei with N approximate to 88. To examine the signatures of octupole correlations in this region, the spdf interacting boson approximation model is applied to Sm isotopes with N = 86-92. The effects of including multiple negative-parity bosons in this basis are compared with more standard one negative-parity boson calculations and are analyzed in terms of signatures for strong octupole correlations. It is found that multiple negative-parity bosons are needed to describe properties at medium spin. Bands with strong octupole correlations (multiple negative-parity bosons) become yrast at medium spin in Sm-148,Sm-150. This region shares some similarities with the light actinides, where strong octupole correlations were also found at medium spin.

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