Measurement of total and partial charge changing and charge pick-up cross-sections for 300A MeV Fe26+ beam in Al with a new system of analysis

Abstract

In the present study, total and partial charge changing cross-sections of 300AMeV Fe26+ ion beam in aluminum target were measured by a new system of analysis installed with the Leica QWin Plus software. The CR39 nuclear track detectors were used to identify the incident charged particles and their fragments. The CR39 detectors just before and just after the target were calibrated and found to have the same charge response and the charge resolution, which were 0.19e and 0.20e, respectively. The response points were fitted with a polynomial of degree one and all the points are within the limits of experimental errors. The value of total charge changing cross-section was calculated to be σtot=(1663±236)mb. To determine the partial charge changing cross-sections for ΔZ=−23,−22,…,−1, number of events corresponding to each fragment were determined from multiple Gaussian fitting of diameter distributions within 95.5% confidence levels and the numbers of incident and survived beam ions were counted within 99.7% confidence levels. Charge pick-up cross-section for ΔZ=+1 was calculated and is (92±6)mb.