The neutron-rich isotopes Tl-211,Tl-213, beyond the N = 126 shell closure, have been studied for the first time in isomer gamma-ray decay, exploiting the fragmentation of a primary uranium beam at the Fragment Separator-Rare Isotopes Investigation at GSI setup. The observed isomeric states in Tl-211,Tl-213 show a deviation from the seniority-like scheme of Tl-209. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.
New spectroscopic information on Tl 211,213: A changing structure beyond the N=126 shell closure / A. Gottardo, J.J. Valiente-Dobon, G. Benzoni, A.I. Morales, A. Gadea, S. Lunardi, P. Boutachkov, A.M. Bruce, M. Gorska, J. Grebosz, S. Pietri, Z. Podolyak, M. Pfutzner, P.H. Regan, D. Rudolph, H. Weick, J. Alcantara Nunez, A. Algora, N. Al-Dahan, G. De Angelis, Y. Ayyad, N. Alkhomashi, P.R.P. Allegro, D. Bazzacco, J. Benlliure, M. Bowry, A. Bracco, M. Bunce, F. Camera, E. Casarejos, M.L. Cortes, F.C.L. Crespi, A. Corsi, A.M. Denis Bacelar, A.Y. Deo, C. Domingo-Pardo, M. Doncel, Z. Dombradi, T. Engert, K. Eppinger, G.F. Farrelly, F. Farinon, H. Geissel, J. Gerl, N. Goel, E. Gregor, T. Habermann, R. Hoischen, R. Janik, S. Klupp, I. Kojouharov, N. Kurz, S.M. Lenzi, S. Leoni, S. Mandal, R. Menegazzo, D. Mengoni, B. Million, D.R. Napoli, F. Naqvi, C. Nociforo, A. Prochazka, W. Prokopowicz, F. Recchia, R.V. Ribas, M.W. Reed, E. Sahin, H. Schaffner, A. Sharma, B. Sitar, D. Siwal, K. Steiger, P. Strmen, T.P.D. Swan, I. Szarka, C.A. Ur, P.M. Walker, O. Wieland, H.-. Wollersheim, F. Nowacki, E. Maglione. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 99:5(2019 Mar 23), pp. 054326.054326-1-054326.054326-7. [10.1103/PhysRevC.99.054326]
New spectroscopic information on Tl 211,213: A changing structure beyond the N=126 shell closure
G. Benzoni;G. De Angelis;A. Bracco;F. Camera;F.C.L. Crespi;A. Corsi;S. Leoni;
2019
Abstract
The neutron-rich isotopes Tl-211,Tl-213, beyond the N = 126 shell closure, have been studied for the first time in isomer gamma-ray decay, exploiting the fragmentation of a primary uranium beam at the Fragment Separator-Rare Isotopes Investigation at GSI setup. The observed isomeric states in Tl-211,Tl-213 show a deviation from the seniority-like scheme of Tl-209. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.
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