Bulg. J. Phys. vol.46 no.4 (2019), pp. 292-302

Collective Coupling between Intrinsic Vortical and Global Rotation Modes Revisited

P. Quentin1,2,3, J. Bartel4, L. Bonneau3, Meng-Hock Koh5,6, Nurhafiza M. Nor5,6, Nor Anita Rezle5,6, Kai-Wen Kelvin Lee
1Division of Nuclear Physics, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
2Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
3Université de Bordeaux, CENBG, UMR5797, F-33170 Gradignan, France
4Institut Pluridisciplinaire Hubert Curien, UMR7178, Université de Strasbourg, CNRS-IN2P3, Strasbourg, France
5Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor Bahru Malaysia
6UTM Centre for Industrial and Applied Mathematics, UTM, 81310 Johor Bahru, Malaysia
Abstract. The reduction of the moments of inertia (MoI) in well deformed nuclei from their rigid body values has been one of the reasons leading Bohr, Mottelson and Pines to propose the description of low-energy nuclear states by BCS-type wavefunctions. This quenching has latter been understood by Mottelson and Valatin in terms of a collective coupling of intrinsic and global rotation modes. In this paper, we review a quantitatively very satisfactory account of this coupling in the framework of so-called Chandrasekhar's S-ellipsoid velocity fields. Another experimental fact at the origin of the BCS wavefunction proposal is the systematic odd-even staggering (OES) of masses observed between odd-A and even-even nuclei. Through a simple self-consistent description of these masses we have shown that with the same parametrization of the residual interaction Vres one is able to reproduce very well both the MoI and OES effects.

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