Energy loss and straggling of 7.3 MeV/nucleon 84Kr ions in Ni, Al and Ti

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Abstract

Energy losses have been measured, both by time of flight and by solid state detector techniques, for 7.3 MeV/amu 84Kr ions passing through foils of Ni, Ti and Al. The experimental ΔE values are comparable to calculated energy losses derived from the works of several authors; however, the calculations of Northcliffe and Schilling underestimate ΔE for 84Kr by ∼20%. Stopping powers were derived from the energy losses in absorbers that were several mg/cm2 thick. These values exhibited substantial scatter, yet their approximate magnitudes and energy variation were reasonably well reproduced by the calculations of Hubert et al. The straggling of 84Kr in Ni and Ti was determined with the solid state detector for energy losses up to 159 MeV. Even for such large ΔE values, the straggling was ≲8 MeV. The net straggling, corrected for the inherent beam spread and detector resolution, was found to vary in accord with the semi-empirical formula of Schmidt-Böcking and Hornung. These results on energy losses, stopping powers, and straggling are especially pertinent to the use of absorbers in nuclear physics experiments.

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    Research sponsored by Division of Nuclear Sciences, Office of Basic Energy Sciences, U.S. Department of Energy, under contract (W-7405-eng-26) with Union Carbide Corp.

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