Abstract
We have studied the fragmentation of Au projectiles interacting with targets of C, Al and Cu at an incident energy ofE/A=600 MeV. The employed inverse kinematics allowed a nearly complete detection of projectile fragments with chargeZ≧2. The recorded fragmentation events were sorted according to three observables, the multiplicityM lp of light charged particles, the largest atomic numberZ max within an event, and a new observable,Z bound, representing the sum of the atomic numbersZ of all fragments withZ≧2. Using these observables, the impact parameter dependence of the fragmentation process was investigated. For all three targets, a maximum mean multiplicity of 3 to 4 intermediate mass fragments (IMFs) is observed. The corresponding impact parameters range from central collisions for theC target to increasingly peripheral collisions for the heavier targets. It is found that the correlation between the IMF multiplicity andZ bound, extending from evaporation type processes (largeZ bound) to the total disassembly of the projectile (smallZ bound), is independent of the target nucleus. This universal behaviour may suggest an — at least partial — equilibration of the projectile fragment prior to its decay.
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Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday
The authors wish to thank the operators of the UNILAC and the SIS for delivering a Au-beam of 600 MeV per nucleon with a good time structure. The technical support during the set-up of the experiment by various groups from GSI, especially by J. Lühning and W. Quick, and the design and production of miniaturized photomultiplier bases by S. Schmitt from CRN Strasbourg is highly appreciated. We are thankful to the EP-division of CERN for the loan of the ALADIN-magnet and to B. Danner from SPS-division for his help in designing the power supply. This work was partly supported by the Bundesministerium für Forschung und Technologie.
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Hubele, J., Kreutz, P., Adloff, J.C. et al. Fragmentation of gold projectiles: From evaporation to total disassembly. Z. Physik A - Hadrons and Nuclei 340, 263–270 (1991). https://doi.org/10.1007/BF01294674
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DOI: https://doi.org/10.1007/BF01294674