Zakopane 2026 Conference on Nuclear Physics

Giant resonances (GR) are fundamental collective modes of nuclear excitation, offering profound insights into the many-body dynamics of nucleons. While the Giant Dipole Resonance (GDR) is a well-established tool for probing nuclear shapes and properties [1], the Isoscalar Giant Quadrupole Resonance (ISGQR) remains a challenging frontier in nuclear structure physics. Although theoretical models suggest importance of the ISGQR γ-decay [2,3], experimental data are extremely scarce due to the dominant competition of the neutron emission channel.
This work focuses on the investigation of both the GDR and the ISGQR in 120Sn through γ-ray measurement. The experiment was conducted at the Cyclotron Centre Bronowice (CCB) in Kraków, utilizing inelastic scattering of a 200 MeV proton beam. This energy was specifically chosen to optimize the excitation cross-sections for the ISGQR collective excitation mode. The experimental setup comprises 18 PARIS detectors [4], four large-volume LaBr₃:Ce detectors (3.5″ × 6″) [5], and 32 KRATTA triple telescopes [6] for light charged-particle identification and energy measurement. Fast plastic scintillation detectors were positioned in front of the each KRATTA detector to ensure good time resolution.
In this contribution, we present the current status of the analysis, with a particular emphasis on the γ-decay of the ISGQR.