Development of the Particle Identification Method by Pulse Shape Analysis in GAGG(Ce) Calorimeter

Proton elastic scattering is one of the best probes to determine nuclei's proton and neutron density distributions, which play an important role in studying the equation of state in asymmetric nuclear matter.

We plan to perform proton elastic scattering experiments in inverse kinematics for unstable nuclei with large isospin asymmetry.

We are developing a new telescope consisting of GAGG(Ce) calorimeters and Si strip detectors for this measurement. The evaluation experiment of the prototype of this telescope was performed at HIMAC in January 2023, and the results showed that the ΔE-E method is insufficient for PID of recoil protons.

On the other hand, the results also showed the possibility that particles can be identified by analyzing the signal waveforms from GAGG(Ce) in a wide energy region.

Recently, we have done another GAGG(Ce) test at RCNP, Osaka University, to evaluate the new PID method by waveform analysis compared with the conventional PID method using a spectrometer and a plastic scintillator.

In this presentation, we will report the results of the test experiments and the performance of this method.