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The JASMIN Collaboration has performed an experiment to conduct measurementsof nuclear reaction rates around the anti-proton production (Pbar) target atthe Fermi National Accelerator Laboratory (FNAL). At the Pbar target station,the target, consisting an Inconel 600 cylinder, was irradiated by a 120 GeV/cproton beam from the FNAL Main Injector. The beam intensity was 3.6 x 10**12protons per second. Samples of Al, Nb, Cu, and Au were placed near the targetto investigate the spatial and energy distribution of secondary particlesemitted from it. After irradiation, the induced activities of the samples weremeasured by studying their gamma ray spectra using HPGe detectors. Theproduction rates of 30 nuclides induced in Al, Nb, Cu, Au samples wereobtained. These rates increase for samples placed in a forward (small angle)position relative to the target. The angular dependence of these reaction ratesbecomes larger for increasing threshold energy. These experimental results arecompared with Monte Carlo calculations. The calculated results generally agreewith the experimental results to within a factor of 2 to 3.

Shielding experiments by the JASMIN collaboration at Fermilab (II) -  Radioactivity measurement induced by secondary particles from the anti-proton  production target