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The γ-coincidence studies of low-spin structures of  210 Bi and  206 Tl are presented. The  210 Bi nucleus, populated in thermal neutron capture reaction, was investigated using EXILL HPGe array at Institut Laue-Langevin in Grenoble. The experimental results were compared to the shell-model calculations allowing to draw the conclusions on the nature of the low-spin excitations populated below the neutron binding energy in  210 Bi (4.6 MeV). It has been found that some levels cannot be described by the valence proton and neutron couplings, but may arise from couplings of valence particles to the 3 -  octupole phonon of the doubly magic  208 Pb core. Moreover, preliminary results of a low-spin structure measurements of  206 Tl by the γ-coincidence technique, making use of the  205 Tl(n,γ)206Tl reaction at the FIPPS prompt γ-ray spectroscopy facility of ILL are shown. The population of a large number of excited states of  206 Tl above the ground state up to the neutron binding energy (at 6.5 MeV), within a few units of spin is expected. The analysis involving double and triple γ-coincidences and γγ-angular correlations will allow to significantly extend the experimental information on the energy and spin-parity of the levels in  206 Tl. This will help shedding light on the proton-hole and neutron-hole couplings near the doubly magic core  208 Pb.

The γ-ray spectroscopy studies of low-spin structures in 210Bi and 206Tl using cold neutron capture reactions

The γ-ray spectroscopy studies of low-spin structures in ²¹⁰Bi and ²⁰⁶Tl using cold neutron capture reactions