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Partial charge-changing cross sections for neutron-deficient isotopes from58Ni fragmentation

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

Abstract

At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments were identified and their charge-changing probabilities in targets of (CH2) n , C, Al, and Pb placed at the exit of the FRS were determined. Whereas a first article dealt with the total charge-changing cross sections, we describe in this second article the element distributions of these secondary fragments, which are found to depend strongly on the isospin of the secondary projectile as well as on the target material. In the case of the lead target, the influence of the electromagnetic dissociation is clearly visible in the one-proton and two-proton removal channels. The preference for the formation of even-Z fragments is much more pronounced for exotic secondary projectiles than for projectiles close to stability. Calculations with a geometrical abrasion-ablation model allow to understand the global features of the experimental data. However, far from stability, the discrepancies between calculations and experimental data increase.

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On leave of absence from Institute of Experimental Physics, University of Warsaw, PL-00-681 Warszawa, Hoźa 69, Poland

We acknowledge the technical support of K.-H. Behr, A. Brünle, and K. Burkard in the preparation phase and during the experiment. H. Folger and the GSI target laboratory prepared the target and degrader layers with the necessary precision. Furthermore, we would like to acknowledge the effort of the SIS operation crew for delivering a high-quality primary beam. This work has been supported by the GSI Hochschulprogramm, the German Bundesminister für Forschung und Technologie under contract 06 DA 461, and the German-French Collaboration Program between GSI and IN2P3.

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Blank, B., Andriamonje, S., Del Moral, R. et al. Partial charge-changing cross sections for neutron-deficient isotopes from58Ni fragmentation. Z. Physik A - Hadrons and Nuclei 352, 77–83 (1995). https://doi.org/10.1007/BF01292762

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  • DOI: https://doi.org/10.1007/BF01292762

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