https://doi.org/10.1051/epjconf/202532901003
Search for shape coexistence in the Selenium isotopes near the N=50 neutron shell closure
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
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.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
