%0 Journal Article
%T 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
%A H. Matsumura
%A N. Kinoshita
%A H. Iwase
%A A. Toyoda
%A Y. Kasugai
%A N. Matsuda
%A Y. Sakamoto
%A H. Nakashima
%A H. Yashima
%A N. Mokhov
%A A. Leveling
%A D. Boehlein
%A K. Vaziri
%A G. Lautenschlager
%A W. Schmitt
%A K. Oishi
%J Physics
%D 2012
%I arXiv
%X In an antiproton production (Pbar) target station of the Fermi National Accelerator Laboratory (FNAL), the secondary particles produced by bombarding a target with 120-GeV protons are shielded by a thick iron shield. In order to obtain experimental data on high-energy neutron transport at more than 100-GeV-proton accelerator facilities, we indirectly measured more than 100-MeV neutrons at the outside of the iron shield at an angle of 50{\deg} in the Pbar target station. The measurement was performed by using the Au activation method coupled with a low-background {\gamma}-ray counting system. As an indicator for the 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 Au activation detector. The measured production rates were compared with the theoretical production rates calculated using PHITS. We proved that the Au activation method can serve as a powerful tool for indirect measurements of more than 100-MeV neutrons that play a vital role in neutron transport. These results will be important for clarifying the problems in theoretical calculations of high-energy neutron transport.
%U http://arxiv.org/abs/1205.0265v1