Search for PDR and ISGQR in \(A\simeq 60\) and \(A=120\) Mass Regions

Le résumé fourni par la source

Measurements of the \(\gamma \) decay from states above the neutron threshold in \(^{120}\)Sn, \(^{62}\)Ni, and \(^{58}\)Ni were performed at the Cyclotron Centre Bronowice (CCB) in Kraków, Poland. The experiment on \(^{120}\)Sn aims to study the Isoscalar Giant Quadrupole Resonance (ISGQR): data on \(\gamma \) decay of the ISGQR are, in fact, scarce and refer to \(^{208}\)Pb only. To better understand this phenomenon, we chose to investigate another nucleus in a different mass region. The experiment on \(^{62}\)Ni and \(^{58}\)Ni, instead, is devoted to the investigation of the low-energy part of the E1 response, denoted as Pygmy Dipole Resonance (PDR), to better understand the systematic dependence on neutron excess in nickel isotopes. It is part of a campaign on PDR, including various complementary measurements carried out at different facilities. The paper will describe the performances and characteristics of the experimental setup together with the first near-line results for both experiments. Abstract Published by the Jagiellonian University 2025 authors

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