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 have been identified and their charge-changing probabilities in targets of CH2, C, Al, and Pb have been determined. We describe the results for the total charge-changing cross sections in this first paper, whereas a second article deals with the partial charge-changing cross sections. At the drip line, the measured charge-changing cross sections exhaust close to 100% of the total interaction cross sections as calculated with semiempirical models. The measurements at the proton drip line with low-Z targets indicate that only a very small increase of the cross sections may be observed, whereas the measurements with a lead target show that no significant increase of the total charge-changing cross sections is present which would be a hint for low-lying dipole strength. Our experimental data are compared to Glauber-type calculations.
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On leave of absence from Institute of Experimental Physics, University of Warsaw, PL-00-681 Warszawa, Hoźa 69, Poland
We would like to acknowledge the technical support of K.-H. Behr, A. Brünle, and of K. Burkard during the experiment. The targets and degraders have been prepared by the GSI target laboratory with high precision. We are indepted to the SIS operation staff for their efforts to deliver a high-quality primary beam. We would like to express our sincere gratitude to D. Hirata for providing us with the RMF density distributions. This work has been supported by the GSI Hochschulprogramm, the German BMFT under contract 06 DA 461, and the German-French Collaboration Program between IN2P3 and GSI.
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Blank, B., Andriamonje, S., Del Moral, R. et al. Total charge-changing cross sections for neutron-deficient isotopes from58Ni fragmentation. Z. Physik A - Hadrons and Nuclei 352, 69–75 (1995). https://doi.org/10.1007/BF01292761
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DOI: https://doi.org/10.1007/BF01292761