Neutron-rich nuclei in the lead region, beyond N = 126, have been studied at the FRS-RISING setup at GSI, exploiting the fragmentation of a primary uranium beam. Two isomeric states have been identified in Hg-210: the 8(+) isomer expected from the seniority scheme in the vg(9/2) shell and a second one at low spin and low excitation energy. The decay strength of the 8(+) isomer confirms the need of effective three-body forces in the case of neutron-rich lead isotopes. The other unexpected low-lying isomer has been tentatively assigned as a 3(-) state, although this is in contrast with theoretical expectations.
New mu s isomers in the neutron-rich Hg-210 nucleus / A. Gottardo, J. J. Valiente-Dobon, G. Benzoni, A. Gadea, S. Lunardi, P. Boutachkov, A. M. Bruce, M. Gorska, J. Grebosz, S. Pietri, Z. S. Podolyak, M. Pfuetzner, P. H. Regan, H. Weick, J. A. 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. D. Bacelar, A. Y. Deo, C. Domingo-Pardo, M. Doncel, Z. S. Dombradi, T. Engert, K. Eppinger, G. F. Farrelly, E. Farinon, E. Farnea, H. Geissel, J. Gerl, N. Goel, E. Gregor, T. Habermann, R. Hoischen, R. Janik, P. R. John, S. Klupp, I. Kojouharov, N. Kurz, S. M. Lenzi, S. Leoni, S. Mandal, R. Menegazzo, D. Mengoni, B. Million, V. Modamio, A.I. Morales Lopez, D. R. Napoli, F. Naqvi, R. Nicolini, C. Nociforo, A. Prochazka, W. Prokopowicz, E. Recchia, R. V. Ribas, M. W. Reed, D. Rudolph, 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. J. Wollersheim. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 725:4/5(2013), pp. 292-296. [10.1016/j.physletb.2013.07.053]
New mu s isomers in the neutron-rich Hg-210 nucleus
A. Bracco;F. Camera;F.C.L. Crespi;S. Leoni;A.I. Morales Lopez;
2013
Abstract
Neutron-rich nuclei in the lead region, beyond N = 126, have been studied at the FRS-RISING setup at GSI, exploiting the fragmentation of a primary uranium beam. Two isomeric states have been identified in Hg-210: the 8(+) isomer expected from the seniority scheme in the vg(9/2) shell and a second one at low spin and low excitation energy. The decay strength of the 8(+) isomer confirms the need of effective three-body forces in the case of neutron-rich lead isotopes. The other unexpected low-lying isomer has been tentatively assigned as a 3(-) state, although this is in contrast with theoretical expectations.File | Dimensione | Formato | |
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