Speaker
Description
The purpose of J-PARC Heavy-Ion Project (J-PARC-HI) is to study very
high-baryon density matter with a heavy ion beam of 1-12AGeV. A new
heavy-ion injector and a new booster are necessary for the heavy-ion
acceleration at J-PARC. Reuse of the KEK 500-MeV booster proton
synchrotron is planned at the first stage of J-PARC-HI. The beam
intensity at the first stage is expected to achieve $10^{8}$ Au ions per
spill, which exceeds the beam intensity of the existing high-energy
heavy-ion facilities.
We proposed a new experiment at the first stage of J-PARC-HI using the J
-PARC E16 spectrometer with a moderate detector and DAQ upgrade. The
goal of the new experiment is to search for the first-order phase transition
to the deconfinement phase at extremely high baryon densities using a di
-electron probe. One of the experimental clearest pieces of evidence for
the first-order phase transition is an observation of a plateau structure in
the "caloric curve", which is the dependence of the temperature on the
excitation energy of the system. The virtual photon with intermediate
mass($1<$M$_{ee}<3$GeV/c$^{2}$) will provide information about the initial
temperature of space-time evolution of the medium. The medium
modification of vector mesons and the lifetime of the hot medium also
can be studied from the di-electron spectra in this experiment.
In this poster, we will show the detailed plan of the experiment and
discuss the experimental feasibility.
