The γ-ray spectroscopy studies of low-spin structures in 210Bi and 206Tl using cold neutron capture reactions
Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland
2 INFN Sezione di Milano and Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
3 Dipartimento di Fisica e Astronomia dell’Università and INFN Sezione di Padova, I-35131 Padova, Italy
4 Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
5 GANIL, Bd. Becquerel, BP 55027, 14076 CAEN Cedex 05, France
6 Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt, Germany
7 LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
8 ELI-NP, Horia Hulubei National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, RO-077125 Bucharest-Magurele, Romania
9 Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093, Warszawa, Poland
* e-mail: email@example.com
Published online: 14 November 2018
The γ-coincidence studies of low-spin structures of 210Bi and 206Tl are presented. The 210Bi 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 210Bi (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 208Pb core. Moreover, preliminary results of a low-spin structure measurements of 206Tl by the γ-coincidence technique, making use of the 205Tl(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 206Tl 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 206Tl. This will help shedding light on the proton-hole and neutron-hole couplings near the doubly magic core 208Pb.
© The Authors, published by EDP Sciences, 2018
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