Speaker
Description
Photo-nuclear reaction on light nuclei (A<60) is important to understand extragalactic propagation of cosmic-rays with energy greater than 1018 eV, but theoretical models of photo-nuclear reactions on these nuclei have been facing challenges due to lack of experimental data. PANDORA project aims at extracting these data such as photo-absorption cross section, E1 strength and branching ratios for particle decay. The experiment using virtual photon method has been done at RCNP in 2023 and 2025, and will be carried out at iThemba LABS. It is also planned to have an experiment using laser compton back scattering gamma beam at ELI-NP. In the experiment at RCNP, the Grand Raiden spectrometer was used combined with silicon detector for charged particle decay measurement and LaBr3 detectors for gamma decay measurement. 392 MeV proton beam was used to excite the target nucleus with forward angle inelastic scattering. Once a nucleus excited to GDR, particle decay happens and gamma decay on daughter nucleus is measured. Although the probability is very low (~ 1%), gamma decay on GDR might be measured with this set up. The preliminary results of gamma decay measurement on the 1st PANDORA experiment at RCNP will be presented.