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Matsuda, Norihiro; Kasugai, Yoshimi; Matsumura, Hiroshi*; Iwase, Hiroshi*; Toyoda, Akihiro*; Yashima, Hiroshi*; Sekimoto, Shun*; Oishi, Koji*; Sakamoto, Yukio*; Nakashima, Hiroshi; et al.
Progress in Nuclear Science and Technology (Internet), 4, p.337 - 340, 2014/04
The Neutrinos at the Main Injector (NuMI) at Fermilab produces intense neutrino beam to investigate the phenomena of the neutrino mixing and oscillation. The Hadron Absorber, consists of thick blocks of aluminum, iron and concrete, is placed at the end of decay volume as a dump for primary proton and secondary particles generated in NuMI. In order to estimate the shielding effect, the reaction rate measurements with activation detector were carried out on the back surface of the absorber. The induced activities in the detectors were measured by analyzing their 
-ray spectra using HPGe detectors. Two kind of peak was showed on two-dimensional distributions of obtained reaction rates at right angle to the beam direction. One was strong peaks at the both horizontal side. And, another smaller was at the top. It was concluded that these peaks were the results of particles streaming through the gaps in the Hadron Absorber shielding.
Kasugai, Yoshimi; Matsuda, Norihiro; Sakamoto, Yukio; Nakashima, Hiroshi; Yashima, Hiroshi*; Matsumura, Hiroshi*; Iwase, Hiroshi*; Hirayama, Hideo*; Mokhov, N.*; Leveling, A.*; et al.
Reactor Dosimetry; 14th International Symposium (ASTM STP 1550), p.675 - 689, 2012/08
Under the collaborative study project of JASMIN, shielding experiments has been carried out using the anti-proton target station (Pbar) of Fermilab. In the experiment, the multi-foil activation technique was utilized, and the neutron spectra in high-energy region between 1 and 100 MeV were deduced by using the "fitting method", which is newly developed. In this method, we made an assumption that neutron energy spectra could be expressed with a simple function. The validity of the fitting method was confirmed by comparison with the results of the unfolding method and the theoretical calculations. Finally, it was found that there are simple correlations between reaction rates and the adjusting parameters in the fitting function. The correlations are useful for estimating the adjusting parameters easily, and a neutron spectrum in the high-energy region can be deduced from a set of reaction-rate data without the complicated calculations of unfolding.
Kasugai, Yoshimi; Matsuda, Norihiro; Iwamoto, Yosuke; Sakamoto, Yukio; Nakashima, Hiroshi; Matsumura, Hiroshi*; Kinoshita, Norikazu*; Iwase, Hiroshi*; Sanami, Toshiya*; Hagiwara, Masayuki*; et al.
Journal of the Korean Physical Society, 59(2), p.2063 - 2066, 2011/08
Times Cited Count：1 Percentile：10.66(Physics, Multidisciplinary)Shielding experiments has been carried out using high energy proton accelerators at Fermi National Accelerator Laboratory (Fermilab) since 2007 under a collaborative study program of JASMIN: Japanese and American Study of Muon Interaction and Neutron Detection. The experiments were carried out at the anti-proton target station (Pbar) and NuMI (Neutrino from Main-Injector). In the Pbar target station, neutron spectra in- and outside of the shield configuration consisting of steel and concrete blocks were measured by a current-readout Bonner spectrometer and activation method. In NuMI, attenuation behavior of muons through rock was observed by activation method. In addition, total dose rates and the contribution rates of some kinds of particle elements along the muon beam axis were measured by using dosimeters such as CR39, TLD, etc. Using these experimental results, the calculation codes for high-energy particle transportation, such as PHITS, were validated.
