Abstract

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Symmetry: Culture and Science
Volume 32, Number 2, pages 294-297 (2021)
https://doi.org/10.26830/symmetry_2021_2_294

EXAMPLE FOR SYMMETRY IN NUCLEAR PHYSICS

Mariya S. Yavahchova, Dimitar Tonev^*

^* Institute for Nuclear Physics and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
E-mail: m.yavahchova@gmail.com

Abstract: Symmetries in Physics are often used to describe interesting and difficult problems. Very often only considering symmetry as an approach could solve a concrete problem. Chiral symmetry is such an exciting example in nuclear physics. This symmetry is dichotomic and its spontaneous breaking by the axial angular momentum vector leads to a pair of degenerate ∆I = 1 rotational bands, called chiral doublet bands. It is appear that a rotation of a triaxial nucleus could lead to a pair of identical (twin) bands. In our work we show two excelent experimental examples of twin bands in two different nulcei. The experiments we have performed with our colleagues using accelerators and multidetector systems. In the first experiment excited nuclear states in 102Rh were populated in the fusion-evaporation reaction 94Zr(11B,3n)102Rh at a beam energy of 36 MeV, using the Indian National Gamma Array spectrometer at Inter University Accelerator Center, New Delhi. In the second experiment, excited states in the nucleus of 134Pr were populated using the fusion-evaporation reaction 119Sn(19F, 4n) at a beam energy of 87 MeV for the recoil distance Doppler-shift (RDDS) measurement. The beam was delivered by the Vivitron accelerator at IReS in Strasbourg.

Keywords: chirality, chirality in nuclear physics, level-schemes of 102Rh, 134Pr.

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