Probing deformed nuclei: Experimental insights into excited states of ${}^{152,153,154}$Gd isotopes through fusion-evaporation reactions

Abstract

The rare-earth region has been the focus of various studies aiming at the understanding of nuclear structure and providing information on the details of the reaction mechanism. The Gd isotopes belong to this group of nuclei and despite the available spectroscopic information, several open questions about their structure still exist, such as the inter-band transitions related to shape evolution or branching-ratios in deformed states. In addition, production cross sections of different reactions to Gd isotopes are largely unknown. In this work, we report on an experimental attempt to populate the excited states in the isotopes ${}^{152,153,154}$Gd by employing the heavy-ion fusion reaction ${}^{18}$O+${}^{138}$Ba $\to$ ${}^{156-x}$Gd + $xn$ in the 58-64 MeV energy range (center-of-mass). The experiment was conducted at the 9 MV FV Pelletron Tandem at the Horia Hulubei National Institute for Physics and Nuclear Engineering, employing the ROSPHERE array. Several branching-ratios for energy levels in ${}^{152,153}$Gd have been measured, offering new and updated values. Furthermore, relative cross sections regarding the fusion-evaporation reactions ${}^{138}$Ba(${}^{18}$O, 4n)${}^{152}$Gd, ${}^{138}$Ba(${}^{18}$O, 3n)${}^{153}$Gd, and ${}^{138}$Ba(${}^{18}$O, 2n)${}^{154}$Gd have been measured and compared with theoretical calculations with PACE4.

arXiv comment13 pages, 8 figures. Accepted manuscript. Published in Nuclear Physics A 1047 (2024) 122888, https://doi.org/10.1016/j.nuclphysa.2024.122888

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