Author/Authors :
Ichige، نويسنده , , M. and Ben، نويسنده , , S. and Crawford، نويسنده , , H.J. and Doke، نويسنده , , T. and Engelage، نويسنده , , J.M. Belman-Flores، نويسنده , , I. and Greiner، نويسنده , , L. and Hayashi، نويسنده , , T. and Kashiwagi، نويسنده , , T. and Kikuchi، نويسنده , , J. and Kobayashi، نويسنده , , M. and Masuda، نويسنده , , K. and Mozumder، نويسنده , , A. and Mitchell، نويسنده , , J.W. and Shibamura، نويسنده , , E. and Takashima، نويسنده , , T. and Tull، نويسنده , , C.E.، نويسنده ,
Abstract :
A new allene-doped liquid argon homogeneous calorimeter has been constructed for measurement of energies of relativistic heavy ions. Its electrode system consists of thin multi-parallel plates and it has been tested for relativistic Au ions from Bevalac at LBL. The results are compared with those obtained by simulation, including “quenching factor”, “positive ion effect” and “electron attachment to electronegative impurities”. The pattern shown in ΔE − E scatter plots, obtained from the multi-parallel plate electrode calorimeter, is in good agreement with those obtained by simulation, but the energy resolution for Au ions is three times or more worse than that of the simulation. At present the reason for the difference is not clear. By simulation, it is shown that the identification of adjacent charges or isotopes is possible for relativistic Na, Fe and La ions stopped in the calorimeter, using signals both from the cell in which ions stopped and from the preceding cell.
