Study of light cluster production in intermediate energetic heavy-RI collision at RIBF

The physics motivation of the SpiRIT (SAMURAI Pion-reconstruction and Ion Tracker) collaboration is to place a constraint on the symmetry energy term in the nuclear equation of state at around twice saturation densities. Charged pion ratio in intermediate energetic heavy-ion collisions(HIC) is predicted as a good probe to extract symmetry energy, however, there is still large model dependence. Not only nucleon dynamics but also cluster-cluster correlation in HIC are reported to influence pion production. In order to discuss pion with less uncertainty, it is necessary to understand properties on nucleon and cluster well.

We performed the experiment at the RIKEN-RIBF with four kinds of Sn-Sn isotopic collisions at 270 MeV/nucleon in spring 2016. Charged particles were measured and identified by the SpiRIT-TPC in combination with the SAMURAI magnet. Light charged particles(LCP) in HIC could be a possible benchmark to understand cluster property. In this talk, yields of LCP and their dynamics will be discussed.