Search for shape coexistence in the Selenium isotopes near the N=50 neutron shell closure

G. Ciconali; F. Conca; S. Bottoni; S. Leoni; B. Fornal; M. Sferrazza; C. Michelagnoli; N. Mărginean; G. Corbari; M. Luciani; G. Colombi; F. Crespi; N. Cieplicka; L. Iskra; M. Jentschel; U. Koester; R. Borcea; M. Boromiza; S. Călinescu; C. Clisu-Stan; C. Costache; D. Filipescu; N. Florea; I. Gheorghe; A. Ionescu; R. Mărginean; C. Mihai; R.E. Mihai; C. Neacșu; A. Negreț; C.R. Niță; A. Olăcel-Coman; S. Pascu; C. Petrone; L. Stan; C. Sotty; A. Turturică; G. Turturică; S. Toma; S. Ujeniuc

doi:10.1051/epjconf/202532901003

All issues

Volume 329 (2025)

EPJ Web Conf., 329 (2025) 01003

Abstract

Open Access

Issue		EPJ Web Conf. Volume 329, 2025 17^th International Symposium on Capture Gamma Ray Spectroscopy and Related Topics (CGS17)


Article Number		01003
Number of page(s)		4
Section		Experimental Nuclear Structure
DOI		https://doi.org/10.1051/epjconf/202532901003
Published online		25 June 2025

EPJ Web of Conferences 329, 01003 (2025)
https://doi.org/10.1051/epjconf/202532901003

Search for shape coexistence in the Selenium isotopes near the N=50 neutron shell closure

G. Ciconali¹^,2^*, F. Conca¹, S. Bottoni¹^,2, S. Leoni¹^,2, B. Fornal³, M. Sferrazza⁴, C. Michelagnoli⁵, N. Mărginean⁶, G. Corbari¹^,2, M. Luciani¹^,2, G. Colombi¹^,2^,5, F. Crespi¹^,2, N. Cieplicka³, L. Iskra³, M. Jentschel⁵, U. Koester⁵, R. Borcea⁶, M. Boromiza⁶, S. Călinescu⁶, C. Clisu-Stan⁶, C. Costache⁶, D. Filipescu⁶, N. Florea⁶, I. Gheorghe⁶, A. Ionescu⁶, R. Mărginean⁶, C. Mihai⁶, R.E. Mihai⁶, C. Neacșu⁶, A. Negreț⁶, C.R. Niță⁶, A. Olăcel-Coman⁶, S. Pascu⁶, C. Petrone⁶, L. Stan⁶, C. Sotty⁶, A. Turturică⁶, G. Turturică⁶, S. Toma⁶ and S. Ujeniuc⁶

¹ Dipartimento di Fisica, Università degli Studi di Milano, Milano, Italy
² Istituto Nazionale di Fisica Nucleare Sez. Milano, Milano, Italy
³ Instytut Fizyki Jądrowej IFJ-PAN, Krakow, Poland
⁴ Université libre de Bruxelles (ULB), Bruxelles, Belgium
⁵ Institut Laue-Langevin (ILL), Grenoble, France
⁶ Horia Hulubei National Institute for Physics and Nuclear Engineering, Măgurele, Romania

^* G. Ciconali: giulia.ciconali@mi.infn.it

Published online: 25 June 2025

Abstract

Aim of this contribution is the investigation of the shape coexistence phenomenon in the neutron-rich Selenium (Z=34) isotopes at or near the N=50 shell closure, by γ-ray spectroscopy. The ⁸³Se (N=49) and ⁸⁴Se (N=50) nuclei were populated by neutron capture (ILL) and a sub-Coulomb barrier transfer reaction (IFIN-HH), respectively. The decay schemes of both nuclei were significantly extended and they are still under investigation. Concerning the ⁸³Se, γ-spectroscopy data allowed for the identification of 28 new primary γ transitions, 16 new levels and 89 new secondary γ transitions. Firm spin and parity assignment of the newly found states will be obtained from angular correlation investigation, currently ongoing. In the case of ⁸⁴Se, the γ decay from the second and third 0^! states were observed for the first time and preliminary results from lifetime measurements were obtained for both the states.

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