Author/Authors :
Manzoor، نويسنده , , S and Qureshi، نويسنده , , I.E and Rana، نويسنده , , M.A and Shahzad، نويسنده , , M.I and Sher، نويسنده , , G and Sajid، نويسنده , , M and Khan، نويسنده , , H.A and Giacomelli، نويسنده , , G and Giorgini، نويسنده , , M and Mandrioli، نويسنده , , G and Patrizii، نويسنده , , L and Popa، نويسنده , , V and Serra، نويسنده , , P and Togo، نويسنده , , V، نويسنده ,
Abstract :
Three stacks of plastic CR-39 Nuclear Track Detectors (NTD) were exposed to 158 A GeV 207Pb ions at the CERN-SPS beam facility. The main purpose of this experiment was the calibration of the CR-39 for the search of atmospheric magnetic monopoles. Different targets (Al, Cu and Pb) were used to produce a large spectrum of charge ions for the purpose of calibration as well as the study of ultrarelativistic lead ion fragmentation. The exposure of each stack was performed at normal incidence with a fluence of about 1500 ion/cm2. The total number of lead ions in each spill was about 7.8×104 and there were eight spills incident on each stack. For the stack with the Cu target, the lengths of etched cones on one face of the CR-39 were measured. From this measurement procedure, a new calibration curve has been generated for the extended charge region 63⩽Z⩽83. The charge resolution (σZ) achieved by this technique is ∼0.18e–0.21e.
