Charge-changing fragmentation of 10.6 GeV/nucleon {sup 197}Au nuclei
- Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130 (United States)
We have measured the charge-changing cross sections of 10.6 GeV/nucleon {sup 197}Au nuclei interacting in targets of CH{sub 2} (polyethylene), C, Al, Cu, Sn, and Pb. Cross sections for H are calculated from those measured in C and CH{sub 2}. The total charge-changing cross sections are higher than those measured at energies of {le}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 ({Delta}{ital Z}) from {Delta}{ital Z}=+1,{sub 80}Hg, down to approximately {Delta}{ital Z}={minus}29,{sub 50}Sn. In comparison to lower energy measurements, these partial cross sections are found to be smaller for small {Delta}{ital Z} and larger or the same for large {Delta}{ital Z}. The H partial cross sections are found to follow a power law in {Delta}{ital Z} 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 {Delta}{ital Z} 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 {ital Z}{sub {ital T}}{sup 1.75{plus_minus}0.01}.
- OSTI ID:
- 69534
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 52; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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