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In an antiproton production (Pbar) target station of the Fermi NationalAccelerator Laboratory (FNAL), the secondary particles produced by bombarding atarget with 120-GeV protons are shielded by a thick iron shield. In order toobtain experimental data on high-energy neutron transport at more than100-GeV-proton accelerator facilities, we indirectly measured more than 100-MeVneutrons at the outside of the iron shield at an angle of 50{\deg} in the Pbartarget station. The measurement was performed by using the Au activation methodcoupled with a low-background {\gamma}-ray counting system. As an indicator forthe neutron flux, we determined the production rates of 8 spallation nuclides(196-Au, 188-Pt, 189-Ir, 185-Os, 175-Hf, 173-Lu, 171-Lu, and 169-Yb) in the Auactivation detector. The measured production rates were compared with thetheoretical production rates calculated using PHITS. We proved that the Auactivation method can serve as a powerful tool for indirect measurements ofmore than 100-MeV neutrons that play a vital role in neutron transport. Theseresults will be important for clarifying the problems in theoreticalcalculations of high-energy neutron transport.

Shielding Experiments Under JASMIN Collaboration at Fermilab(III) -  Measurement of High-Energy Neutrons Penetrating a Thick Iron Shield from the  Antiproton Production Target by AU Activation Method