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

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

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 r...

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Main Authors: Ciconali G., Conca F., Bottoni S., Leoni S., Fornal B., Sferrazza M., Michelagnoli C., Mărginean N., Corbari G., Luciani M., Colombi G., Crespi F., Cieplicka N., Iskra L., Jentschel M., Koester U., Borcea R., Boromiza M., Călinescu S., Clisu-Stan C., Costache C., Filipescu D., Florea N., Gheorghe I., Ionescu A., Mărginean R., Mihai C., Mihai R.E., Neacșu C., Negreț A., Niță C.R., Olăcel-Coman A., Pascu S., Petrone C., Stan L., Sotty C., Turturică A., Turturică G., Toma S., Ujeniuc S.
Format: Article
Language:English
Published: EDP Sciences 2025-01-01
Series:EPJ Web of Conferences
Online Access:https://www.epj-conferences.org/articles/epjconf/pdf/2025/14/epjconf_cgs17_01003.pdf
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Summary: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.
ISSN:2100-014X

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