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arXiv · 1608.07840

Longitudinal Wobbling in $^{133}$La

S. Biswas·R. Palit·S. Frauendorf·U. Garg·W. Li·G. H. Bhat·J. A. Sheikh·J. Sethi·S. Saha·Purnima Singh·D. Choudhury·J. T. Matta·A. D. Ayangeakaa·W. Dar·V. Singh·S. Sihotra
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Abstract

Excited states of $^{133}$La have been investigated to search for the wobbling excitation mode in the low-spin regime. Wobbling bands with $n_\omega$ = 0 and 1 are identified along with the interconnecting $\Delta I$ = 1, $E2$ transitions, which are regarded as one of the characteristic features of the wobbling motion. An increase in wobbling frequency with spin implies longitudinal wobbling for $^{133}$La, in contrast with the case of transverse wobbling observed in $^{135}$Pr. This is the first observation of a longitudinal wobbling band in nuclei. The experimental observations are accounted for by calculations using the quasiparticle-triaxial-rotor (QTR) model, which attribute the appearance of longitudinal wobbling to the early alignment of a $\pi=+$ proton pair.

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S. Biswas, R. Palit, S. Frauendorf, U. Garg, W. Li, G. H. Bhat, J. A. Sheikh, J. Sethi, S. Saha, Purnima Singh, D. Choudhury, J. T. Matta, A. D. Ayangeakaa, W. Dar, V. Singh, S. Sihotra. 2016-08-28. Longitudinal Wobbling in $^{133}$La. https://arxiv.org/abs/1608.07840

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