ANALYSIS OF DATA OBTAINED WITH AU IONS OF 700 MEV N ENERGY IN AN ALLENE-DOPED LIQUID AR HOMOGENEOUS CALORIMETER/

A new allene-doped liquid argon homogeneous calorimeter has been const ructed for measurement of energies of relativistic heavy ions, its ele ctrode system consists of thin multi-parallel plates and it has been t ested for relativistic Au ions from Bevalac at LBL. The results are co mpared with those obtained by simulation, including ''quenching factor '', ''positive ion effect'' and ''electron attachment to electronegati ve impurities''. The pattern shown in Delta E-E scatter plots, obtaine d from the multi-parallel plate electrode calorimeter, is in good agre ement with those obtained by simulation, but the energy resolution for An 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 i s shown that the identification of adjacent charges or isotopes is pos sible for relativistic Na, Fe and La ions stopped in the calorimeter, using signals both from the cell. in which ions stopped and from the p receding cell.