Speaker
Description
We have launched the “ONOKORO” project to understand cluster formation phenomena in nuclei and nuclear matter from measurements of the cluster knockout reactions (($p$,$p$X) reactions(X=$d$, $t$, $^3\mathrm{He}$, $\alpha$)).
In order to measure the reactions using inverse-kinematics, we have developed the “TOGAXSI” telescope consisting of Si trackers and large GAGG:Ce calorimeters. The required performance of the calorimeter is high energy resolution(~1$A$ MeV (rms)) under the high count rate (~100 kcps) and wide energy range (100$A$-250$A$ MeV).Therefore, we have developed new calorimeter using large GAGG:Ce crystal(35 mm $\times$ 35 mm $\times$ 120 mm) which is high resolution(8~9 % (662 keV, FWHM)), high density (~6.63 g/cm$^3$) and fast response(decay time~90 ns).
In this presentation, we report recent results of the performance test with proton and $\alpha$ beam at HIMAC, QST.
