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Report No.

Spectrometer design for a future heavy-ion program at J-PARC

Sako, Hiroyuki   ; Harada, Hiroyuki  ; Imai, Kenichi; Nagamiya, Shoji; Ozawa, Kyoichiro; Saha, P. K.   ; Nishio, Katsuhisa   ; Hwang, S.

In heavy-ion collisions at 10 AGeV/c, the baryon density is expected to reach 10 times as high as the normal nucleus density. We are designing a spectrometer for a future heavy-ion experiment. We aim at observing directly the information on high baryon density in dilepton measurements. The spectrometer consists of a solenoid spectrometer which covers the backward acceptance at the polary angle larger than 30 degrees, and a dipole spectrometer which covers the polar angle less than 30 degrees. Hadrons will be identified by Time-of-flight counters, electrons will be identified by a Ring Imaging Cherencov Counters, photons will be identified by electromagnetic calorimeters, and muons will be measured by iron absorbers and trackers.



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