Search for the origin of wobbling motion in the $ A \approx 130 $ region: The case of $^{131}$Xe

Author:

S. Chakraborty, S. Bhattacharyya, R. Banik, Soumik Bhattacharya, G. Mukherjee, C. Bhattacharya, S. Biswas, S. Rajbanshi, Shabir Dar, S. Nandi, Sajad Ali, S. Chatterjee, S. Das, S. Das Gupta, S. S. Ghugre, A. Goswami, A. Lemasson, Debasish Mondal, S. Mukhopadhyay, A. Navin, H. Pai, Surajit Pal, Deepak Pandit, R. Raut, Prithwijita Ray, M. Rejmund, S. Samanta

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex)

journal:

date:

2023-11-16 00:00:00

Abstract

In-beam $ \gamma $-ray spectroscopy of $^{131}$Xe has been carried out to study the structure of the intruder $ \nu h_{11/2} $ band. Excited states were populated via an $ \alpha $-induced fusion-evaporation reaction at E$ _{\alpha} = 38 $ MeV. Inspection of $ \gamma \gamma $-coincidence data resulted in the identification of a new rotational sequence. Based on the systematics of excitation energy, assigned spin-parity, decay pattern, and the electromagnetic character of the inter-band $ \Delta I = 1 $ $ \gamma $-transitions, this sequence is proposed as the unfavoured signature partner of the $ \nu h_{11/2} $ band. The structure of this band is further illuminated in the light of the triaxial particle rotor model (TPRM). The possibility of wobbling excitation in $ N = 77 $ Xe-Ba-Ce isotones has been explored in a systematic manner.

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