Speaker
Description
J-PARC Heavy-Ion Project (J-PARC-HI) aims at exploring high-baryon density matter in heavy-ion collisions at 1-12 AGeV/c with high-intensity frontier heavy-ion beams. We have designed a heavy-ion acceleration scheme, where a heavy-ion beam is produced in a new heavy-ion injector consisting of a heavy-ion linac and a booster ring, and further accelerated with the existing high-intensity 3-GeV (RCS) and 30-GeV (MR) proton synchrotrons. The heavy-ion beam extracted from MR is transported to the Hadron Experimental Facility to perform the experiment. We will study the properties of the dense matter, explore the phase structures of the QCD phase diagram in the high-baryon density regime such as the first-order phase boundary and the QCD critical point, and search for color-superconducting phases. We will also measure various strange particles/nuclei and study their correlations to unveil the EOS of the matter. In this presentation, we show the development of the staging plan of the project, where in the first phase we will perform the experiment at the upgraded J-PARC E16 spectrometer with $10^{8}$ Hz beams, and in the second phase we will perform the experiment at a new large acceptance spectrometer with $10^{11}$ beams. In particular, we discuss detailed experimental plans with detector upgrades in the first phase such as di-electron and hadron measurements, and the design of a large acceptance spectrometer for event-by-event fluctuations, di-lepton, and heavy flavors in the second phase.
