Longitudinal wobbling in$^{133}$La

Biswas, S.; Palit, R.; Frauendorf, S.; Garg, U.; Li, W.; Bhat, G.H.; Sheikh, J.A.; Sethi, J.; Saha, S.; Singh, Purnima

doi:10.1140/epja/i2019-12856-5

Longitudinal wobbling in $^{133}$ La

Aug 28, 2016

7 pages

Published in:

Eur.Phys.J.A 55 (2019) 9, 159

Published: Sep 20, 2019

e-Print:

1608.07840 [nucl-ex]

DOI:

10.1140/epja/i2019-12856-5

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Abstract: (Springer)

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 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.

Note:

9 pages, 6 figures, 1 table

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