A Shell Model Description of the Decay Out of the Super-Deformed Band of 36Ar

Abstract

Large scale shell model calculations in two major oscillator shells (sd and pf) describe simultaneously the super-deformed excited band of 36Ar and its low-lying states of dominant sd character. In addition, several two particle two hole states and a side band of negative parity are also well reproduced. We explain the appearance of the super-deformed band at such low excitation energy as a consequence of the very large correlation energy of the configurations with many particles and many holes (np-nh) relative to the normal filling of the spherical mean field orbits (0p-0h). We study the mechanism of mixing between these different configurations, to understand why the super-deformed band survives and how it finally decays into the low-lying sd-dominated states via the indirect mixing of the 0p-0h and 4p-4h configurations.

4 pages 5 figures, revtex4, revised version, minor changes

References in corpus (3)

• The Shell Model as Unified View of Nuclear Structure
• Beyond-mean-field-model analysis of low-spin normal-deformed and superdeformed collective states of S32, Ar36, Ar38 and Ca40
• Description of the superdeformed band of ${}^{36}$Ar with the Gogny force

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• Backbendings of Superdeformed bands in ${}^{36,40}$Ar
• Determining the Energy Barrier for Decay out of Superdeformed Bands