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

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.

Document type :

Journal articles

Domain :

Physics [physics] / Nuclear Experiment [nucl-ex]

Complete list of metadatas

Cited literature [7 references] Display Hide Download

http://hal.in2p3.fr/in2p3-01481899
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, January 24, 2018 - 1:47:23 PM
Last modification on : Thursday, February 7, 2019 - 2:54:13 PM
Long-term archiving on : Thursday, May 24, 2018 - 4:47:06 PM

Europhysics_Letters_117_p12001...

Publisher files allowed on an open archive

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

File

Identifiers

Collections

Citation

Export

Metrics

479

34

Contact

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

File

Identifiers

Collections

Citation

Export

Share

Metrics

479

34

Contact