New isomer in $^{96}$Y marking the onset of deformation at N = 57

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; A. Ur; W. Urban; D. Bazzacco; G. Benzoni; S. Bottoni; A. Bruce; N. Cieplicka-Oryńczak; C. Crespi; L. M. Fraile; W. Korten; T. Kröll; S. Lalkovski; N. Márginean; C. Michelagnoli; B. Melon; D. Mengoni; B. Million; A. Nannini; D. Napoli; Zs. Podolyák; P. H. Regan; B. Szpak

doi:10.1209/0295-5075/117/12001

New isomer in $^{96}$Y marking the onset of deformation at N = 57

W. Iskra B. Fornal S. Leoni G. Bocchi A. Petrovici C. Porzio A. Blanc ¹ G. De France ² M. Jentschel ¹ U. Köster ¹ P. Mutti ¹ J.-M. Régis G. Simpson ³ T. Soldner ¹ A. Ur W. Urban D. Bazzacco G. Benzoni S. Bottoni A. Bruce N. Cieplicka-Oryńczak C. Crespi L. M. Fraile W. Korten ⁴ T. Kröll S. Lalkovski N. Márginean C. Michelagnoli ² B. Melon D. Mengoni B. Million A. Nannini D. Napoli Zs. Podolyák P. H. Regan B. Szpak

1 ILL - Institut Laue-Langevin

2 GANIL - Grand Accélérateur National d'Ions Lourds

3 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

4 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

Abstract : 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.

Type de document :

Article dans une revue

EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2017, 117 (1), pp.12001. 〈10.1209/0295-5075/117/12001〉

Domaine :

Physique [physics] / Physique Nucléaire Expérimentale [nucl-ex]

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