Lead Projectile Fragmentation on Aluminum Target: Improved Experimental Results
- 1 Physics Division Nilore Islamabad
- 2
- 3
Abstract
We investigate 158A GeV 207Pb projectile fragmentation on Al target using CR-39 nuclear track detectors. A stack containing target-detectors assembly was irradiated at SPS-CERN. After chemical etching, detectors were scanned using an optical microscope to collect the data in the form of etched cone heights. From the cone height measurements, total and partial charge changing cross sections of 207Pb projectiles on aluminum target are determined. The results are compared with both relevant published measurements available in the literature and model predictions. Odd-even effect in the formation of the fragments of 158A GeV 207Pb pro-jectiles is observed in a consistent and a clear manner over the observed range of fragments (Z=63-81). This is achieved by using optimized etching and track measurement conditions.
- C. J. Waddington, “The Propagation of Ultraheavy Cosmic-Ray Nuclei Using Energy-Dependent Cross Sections,” Astrophysical Journal, Vol. 470, No. 2, 1996, pp. 1218-1226. doi:10.1086/177944
- C. A. Bertulani and G. Baur, “Electromagnetic Processes in Relativistic Heavy Ion Collisions,” Physical Reports, Vol. 163, No. 5-6, 1988, pp. 299-408.
- C. Brechtmann and W. Heinrich, “Fragmentation of 16O at 60, 200 GeV/Nucleon,” Zeitschrift fur Physik A, Vol. 330, No. 4, 1988, pp. 407-416.
- I. E. Qureshi, M. I. Shahzad, M. T. Javed, S. Manzoor, G. Sher, F. Aleem and H. A. Khan, “Study of Projectile Fragmentation in the Reaction (158A GeV) Pb + Pb Using CR-39,” Radiation Measurements, Vol. 40, No. 2-6, 2005, pp. 437-441.
- H. Dekhissi, G. Giacomelli, G. Mandrioli, S. Manzoor, L. Patrizii, V. Poppa, P. Serra and V. Togo, “Fragmentation Studies of 158A GeV Pb Ions Using CR-39 Nuclear Track Detectors,” Nuclear Physics A, Vol. 662, No. 1-2, 2000, pp. 207-216.
- C. Scheidenberger, I. A. Pshenichnov, K. Sümmerer, A. Ventura, et al., “Charge-Changing Interaction of Ultrarelativistic Pb Nuclei,” Physical Review C, Vol. 70, No. 1, 2004, pp. 014902 (1-16).
- Y. D He and P. B. Price, “Nuclear and Electromagnetic Fragmentation of 2.25 TeV197Au Nuclei,” Zeitschrift Für Physik A Hadrons and Nuclei, Vol. 348, No. 2, 1994, pp. 105-109. doi:10.1007/BF01289597
- S. E. Hirzebruch, E. Becker, G. Hüntrup, T. Streibel, E. Winkel and W. Heinrich, “Charge-Changing Interaction of 197Au at 10 GeV/Nucleon in Collision with Targets from H to Pb,” Physical Review C, Vol. 51, No. 4, 1995, pp. 2085-2090. doi:10.1103/PhysRevC.51.2085
- P. B. Price and Y. D. He, “Behaviour of Nuclear Projectile Fragments Produced in Collision of 14.5 A GeV 28Si with Pb and Cu Targets,” Physical Review C, Vol. 43, No. 2, 1991, pp. 835-845. doi:10.1103/PhysRevC.43.835
- G. Sher, M. I. Shahzad and M. Hussain, “Fragmentation of (158A GeV) Pb Ions with Bi Target,” Radiation Measurements, Vol. 42, No. 10, 2007, pp. 1692-1695. doi:10.1016/j.radmeas.2007.09.006
- M. A. Rana and Shahid Manzoor, “Examining the Fragmentation of 158A GeV Lead Ions on Copper Target: Charge-Changing Cross Sections,” Radiation Measurements, Vol. 43, No. 8, 2008, pp. 383-1389.
- M. A. Rana, “How to Achieve Precision and Reliability in Experiments Using Nuclear Track Detection Technique?” Nuclear Instruments and Methods in Physics Re- search Section A, Vol. 592, No. 3, 2008, pp. 354-360. doi:10.1016/j.nima.2008.04.025