Volume 117, Number 1, January 2017
|Number of page(s)||6|
|Published online||28 February 2017|
New isomer in 96Y marking the onset of deformation at N = 57
1 Institute of Nuclear Physics, PAN - PL-31-342 Kraków, Poland
2 Dipartimento di Fisica, Università degli Studi di Milano - I-20133 Milano, Italy
3 INFN, Sezione di Milano - via Celoria 16, I-20133, Milano, Italy
4 Horia Hulubei National Institute of Physics and Nuclear Engineering - Bucharest, 077125, Romania
5 ILL - 71 Avenue des Martyrs, F-38042 Grenoble CEDEX 9, France
6 GANIL - BP 55027, F-14076 Caen CEDEX 5, France
7 IKP, University of Cologne - Zülpicher Str. 77, D-50937 Köln, Germany
8 LPSC - 53 Avenue des Martyrs, F-38026 Grenoble, France
9 INFN, Sezione di Padova - Padova, Italy
10 ELI-NP - Magurele-Bucharest, Romania
11 Faculty of Physics, University of Warsaw - ul. Pasteura 5, PL-02-093 Warsaw, Poland
12 SCEM, University of Brighton - Lewes Road, Brighton BN2 4GJ, UK
13 Grupo de Fsica Nuclear, Universidad Complutense, CEI Moncloa - 28040 Madrid, Spain
14 CEA, Centre de Saclay, IRFU - F-91191 Gif-sur-Yvette, France
15 Institut fr Kernphysik, TU Darmstadt - Schlossgartenstrasse 9, D-64289 Darmstadt, Germany
16 Faculty of Physics, University of Sofia - 5 James Bourchier Blvd, 1164 Sofia, Bulgaria
17 INFN, Sezione di Firenze - Firenze, Italy
18 Dipartimento di Fisica, Università degli Studi di Padova - I-35131 Padova, Italy
19 INFN, Laboratori Nazionali di Legnaro - I-35020 Padova, Italy
20 Acoustics and Ionizing Radiation Division, National Physical Laboratory Teddington, Middlesex, TW11 0LW, UK
Received: 26 January 2017
Accepted: 13 February 2017
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.
PACS: 23.20.Lv – γ transitions and level energies / 25.85.Ec – Neutron-induced fission / 21.60.-n – Nuclear structure models and methods
© EPLA, 2017
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