STUDIES OF 44Ti AND 48Cr NUCLEI WITHIN VARIATIONAL MEAN FIELD THEORY

Roy, Prianka; Dhiman, Shashi K.

doi:10.1142/s0218301310016648

Cited by 3 publications

(1 citation statement)

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“…Almost all previous studies of 48 Cr find an yrast band with an intrinsic prolate deformation before the backbend, and after the backbend, find that 48 Cr transitions towards sphericity and with a lack of an intrinsic state above the backbend (see for example [7][8][9][10][11][12][13][14][15][16], and Ref. [17] for a detailed model comparison).…”

Section: Introductionmentioning

confidence: 99%

New Insights into Backbending in the Symmetry-adapted Framework

D.¹,

Sargsyan²,

Launey³

et al. 2022

Preprint

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We provide new insights into backbending phenomenon within the symmetry-adapted framework which naturally describes the intrinsic deformation of atomic nuclei. For 20 Ne, the canonical example of backbending in light nuclei, the ab initio symmetry-adapted no-core shell model shows that while the energy spectrum replicates the backbending from experimental energies under the rigid rotor assumption, there is no change in the intrinsic deformation or intrinsic spin of the yrast band around the backbend. For the traditional example of 48 Cr, computed in the valence shell with empirical interactions, we confirm a high-spin nucleus that is effectively spherical, in agreement with previous models. However, we find that this spherical distribution results, on average, from an almost equal mixing of deformed prolate shapes with deformed oblate and triaxial shapes. Microscopic calculations confirm the importance of spin alignment and configuration mixing, but surprisingly unveil no anomalous increase in moment of inertia. This finding opens the path toward further understanding the rotational behavior and moment of inertia of medium-mass nuclei.

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