  Experimental studies of shielding and radiation effects at Fermi National
Accelerator Laboratory (FNAL) have been carried out under collaboration between
FNAL and Japan, aiming at benchmarking of simulation codes and study of
irradiation effects for upgrade and design of new high-energy accelerator
facilities. The purposes of this collaboration are (1) acquisition of shielding
data in a proton beam energy domain above 100 GeV; (2) further evaluation of
predictive accuracy of the PHITS and MARS codes; (3) modification of physics
models and data in these codes if needed; (4) establishment of irradiation
field for radiation effect tests; and (5) development of a code module for
improved description of radiation effects. A series of experiments has been
performed at the Pbar target station and NuMI facility, using irradiation of
targets with 120 GeV protons for antiproton and neutrino production, as well as
the M-test beam line (M-test) for measuring nuclear data and detector
responses. Various nuclear and shielding data have been measured by activation
methods with chemical separation techniques as well as by other detectors such
as a Bonner ball counter. Analyses with the experimental data are in progress
for benchmarking the PHITS and MARS15 codes. In this presentation recent
activities and results are reviewed.
