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Report No.

Shielding experiments at high energy accelerators of FERMI, 9; Deduction of high energy neutron spectra

Kasugai, Yoshimi  ; Yashima, Hiroshi*; Matsuda, Norihiro  ; Kinoshita, Norikazu*; Matsumura, Hiroshi*; Iwase, Hiroshi*; Nakashima, Hiroshi; Sakamoto, Yukio; Hirayama, Hideo*; Ishibashi, Kenji*; Oishi, Koji*; Nakamura, Takashi*; Leveling, A.*; Boehnlein, D.*; Kamran, V.*; Mokhov, N.*; Lautenschlager, G.*; Wayne, S.*

On the shielding experiment, started on 2007, as collaborative research with Fermilab using high energy proton accelerators, the measurement of reaction rate distributions in the antiproton target station has been carried out. Reaction rates were measured with activation method. Using the reaction rate data, neutron spectra at each measurement position were deduced by means of nonlinear least square method; a shape of the neutron spectrum between 5 and 100 MeV was expressed as a fitting function with 5 fitting parameters, whose values were determined at a minimum of $$chi$$$$^{2}$$ values for the reaction rates. In the presentation, systematics of the variation of neutron spectra in the shield will be discussed.



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