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Nuclear and electromagnetic fragmentation of 2.25-TeV197Au nuclei

  • Heavy Ion Physics
  • Published:
Zeitschrift für Physik A Hadrons and Nuclei

Abstract

We report the first measurement of the total charge-loss cross section σtot=σem+σnuc and partial cross sections (for ΔZ=1, 2, ..., 9) of 11.4 A GeV197Au nuclei in various targets. The large Coulomb barrier for Au reduces the electromagnetic contribution σem in a Pb target to only 18% of σnuc, compared with ∼ 70% for 14.5 A GeV28Si and 120% for 200 A GeV32S. With σem taken to be ∝Z 1.8T , σnuc can be fitted with σnuc=α(A 1/3P +A 1/3T −b)2, with b=0.83 and α=59 mb, essentially the same as found at energies of 1 to 2 A GeV. Electromagnetic partial cross sections for ΔZ=1 exceed ∼ 40 mb in the Pb, Sn, Cu, and Fe targets and are substantial for larger values ofΔZ in the heavier targets.

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Authors and Affiliations

  1. Physics Department, University of California, USA

    Y. D. He & P. B. Price

  2. Nuclear Science Division, Lawrence Berkeley Laboratory, 94720, Berkeley, CA, USA

    Y. D. He & P. B. Price

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  1. Y. D. He
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  2. P. B. Price
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Additional information

We are indebted to D. Beavis and the staff of the Alternating Gradient Synchrotron at Brookhaven National Laboratory for producing the beam of 11.4 A GeV Au ions, to D. Snowden-Ifft for his efforts in developing the automated scanning system, and to S. Hirzebruch for a useful discussion. This work was supported in part by the Office of Energy Research, Office of High Energy and Nuclear Physics, Division of High Energy Physics, of the Department of Energy under contract No. DEAC03-76SF00098.

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He, Y.D., Price, P.B. Nuclear and electromagnetic fragmentation of 2.25-TeV197Au nuclei. Z. Physik A - Hadrons and Nuclei 348, 105–109 (1994). https://doi.org/10.1007/BF01289597

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  • DOI: https://doi.org/10.1007/BF01289597

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