The level scheme of 96Y was significantly extended and a new 201 ns isomer was located at 1655 keV excitation energy, with spin-parity assignment of 5± or 6-. The isomer decays to spherical low-spin structure by transitions with large hindrance and is fed by a short cascade which resembles the beginning of a rotational band. This is in analogy with the feeding and decay pattern of the 4- isomer in 98Y, here confirmed, by lifetime analysis, as a bandhead of a rotational structure with sizable deformation. It is suggested that the new isomer in 96Y arises from a shape change between deformed and spherical configurations, which indicates the appearance of deformation already at N = 57 in the yttrium chain. The experimental findings for 96Y are strengthened by theoretical calculations based on the complex Excited Vampir model.
New isomer in 96Y marking the onset of deformation at N = 57 / Ł.W. Iskra, B. Fornal, S. Leoni, G. Bocchi, A. Petrovici, C. Porzio, A. Blanc, G. De France, M. Jentschel, U. Köster, P. Mutti, J.M. Régis, G. Simpson, T. Soldner, C.A. Ur, W. Urban, D. Bazzacco, G. Benzoni, S. Bottoni, A. Bruce, N. Cieplicka-Oryńczak, F.C.L. Crespi, L.M. Fraile, W. Korten, T. Kröll, S. Lalkovski, N. Márginean, C. Michelagnoli, B. Melon, D. Mengoni, B. Million, A. Nannini, D. Napoli, Z. Podolyák, P.H. Regan, B. Szpak. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 117:1(2017), pp. 12001.1-12001.6.
|Titolo:||New isomer in 96Y marking the onset of deformation at N = 57|
|Parole Chiave:||Physics and Astronomy (all)|
|Settore Scientifico Disciplinare:||Settore FIS/01 - Fisica Sperimentale|
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1209/0295-5075/117/12001|
|Appare nelle tipologie:||01 - Articolo su periodico|