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The Charge-Changing Fragmentation of 10.6 GeV/nucleon ^(197)Au Nuclei

Geer, L. Y. and Klarmann, J. and Nilsen, B. S. and Waddington, C. J. and Binns, W. R. and Cummings, J. R. and Garrard, T. L. (1995) The Charge-Changing Fragmentation of 10.6 GeV/nucleon ^(197)Au Nuclei. Physical Review C, 52 (1). pp. 334-337. ISSN 0556-2813. doi:10.1103/PhysRevC.52.334.

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We have measured the charge-changing cross sections of 10.6 GeV/nucleon ^(197)Au nuclei interacting in targets of CH_2 (polyethylene), C, Al, Cu, Sn, and Pb. Cross sections for H are calculated from those measured in C and CH_2. The total charge-changing cross sections are higher than those measured at energies of ≤1 GeV/nucleon. The measured cross sections for the heavier targets are somewhat larger than those predicted by a model based on data taken at lower energies with lighter targets. Partial charge-changing cross sections for the production of fragments from the incident Au projectiles were measured for charge changes (ΔZ) from ΔZ=+1_(,80)Hg, down to approximately ΔZ=-29_(,50)Sn. In comparison to lower energy measurements, these partial cross sections are found to be smaller for small ΔZ and larger or the same for large ΔZ. The H partial cross sections are found to follow a power law in ΔZ similar to that for heavier targets, instead of the exponential form observed at lower energies. Factorization is found to hold for all partial cross sections with ΔZ greater than two. In the heavier targets, the cross sections for one and two proton removal have significant contributions from electromagnetic dissociation. The electromagnetic dissociation contribution to the total cross section is derived and found to be relatively small, but with a strong dependence on the charge of the target nuclei of the form Z_T^(1.75±0.01).

Item Type:Article
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Binns, W. R.0000-0001-6110-3407
Alternate Title:The Charge-Changing Fragmentation of 10.6 GeV/nucleon 197 Au Nuclei
Additional Information:© 1995 The American Physical Society. Received 27 December 1994. We thank E. C. Stone and B. W. Gauld of Caltech and Dana Beavis and the staff of Brookhaven National Laboratory. We also thank W. Heinrich for communication of results prior to publication. This work was supported in part by NASA and DOE.
Group:Space Radiation Laboratory
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Department of Energy (DOE)UNSPECIFIED
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Space Radiation Laboratory1995-35
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Record Number:CaltechAUTHORS:20140619-153743030
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46374
Deposited By: Deborah Miles
Deposited On:20 Jun 2014 19:05
Last Modified:10 Nov 2021 17:24

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