Faculty of Physics - University of Bucharest

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FACULTY OF PHYSICS

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2024-11-22 2:34

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Conference: Bucharest University Faculty of Physics 2021 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Wobbling Phenomenon in Odd-Mass Nuclei

Authors:

POENARU ROBERT

^*
Affiliation:

1) Doctoral School of Physics, University of Bucharest, Bucharest, Romania

2) Department of Theoretical Physics, IFIN-HH, Magurele, Romania

E-mail

robert.poenaru@drd.unibuc.ro

Keywords:

wobbling motion, rotational bands, negative parity

Abstract:

The wobbling properties of several odd-mass nuclei are studied using a semi-classical framework that is based on the Particle Rotor Model (PRM). Nuclear wobbling motion consists of the precession of the total angular momentum around the rotational axis, combined with an oscillation of its projection on the quantization axis around a steady position. For odd-mass nuclei without any symmetry axis, this collective motion arises from the coupling of an even-even triaxial core and a single odd-$j$ nucleon (proton or neutron). Depending on the angular momentum alignment between the two systems, two wobbling regimes can occur: longitudinal and transverse. Almost all nuclei in which wobbling motion has been experimentally confirmed behave as transverse wobblers. Recently, two new isotopes ($^{183,187}$Au) were discovered. Remarkable is the fact that for $^{183}$Au, the coexistence of both wobbling regimes has been identified. In the present work, the excitation energies belonging to the wobbling spectrum for both nuclei are described using an expression for the energy function that depends on several parameters such as the moments of inertia, single-particle potential strength, and the triaxiality parameter $gamma$. Interpretation of the obtained results is given in terms of the parameters.

References:

1) Raduta, A. A., Poenaru, R., & Raduta, C. M. (2020). Towards a new semi-classical interpretation of the wobbling motion in 163Lu. Journal of Physics G: Nuclear and Particle Physics, 47(2), 025101.

2) Sensharma, N., Garg, U., Chen, Q. B., Frauendorf, S., Burdette, D. P., Cozzi, J. L., ... & Palit, R. (2020). Longitudinal Wobbling Motion in Au 187. Physical review letters, 124(5), 052501.

3) Nandi, S., Mukherjee, G., Chen, Q. B., Frauendorf, S., Banik, R., Bhattacharya, S., ... & Goswami, A. (2020). First Observation of Multiple Transverse Wobbling Bands of Different Kinds in Au 183. Physical Review Letters, 125(13), 132501.