ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 1 April 2012
Page Count: 11

Fitting Method for Spectrum Deduction in High-Energy Neutron Field Induced by GeV-Protons Using Experimental Reaction-Rate Data

Kasugai, Y.
Japan Atomic Energy Agency, Tokai-mura, Ibaraki-ken

Matsuda, N.
Japan Atomic Energy Agency, Tokai-mura, Ibaraki-ken

Sakamoto, Y.
Japan Atomic Energy Agency, Tokai-mura, Ibaraki-ken

Nakashima, H.
Japan Atomic Energy Agency, Tokai-mura, Ibaraki-ken

Yashima, H.
Research Reactor Institute, Kyoto Univ., Osaka,

Matsumura, H.
High Energy Accelerator Organization, Tsukuba, Ibaraki

Iwase, H.
High Energy Accelerator Organization, Tsukuba, Ibaraki

Hirayama, H.
High Energy Accelerator Organization, Tsukuba, Ibaraki

Mokhov, N.
Fermi National Accelerator Laboratory, Batavia, IL

Leveling, A.
Fermi National Accelerator Laboratory, Batavia, IL

Boehnlein, D.
Fermi National Accelerator Laboratory, Batavia, IL

Vaziri, K.
Fermi National Accelerator Laboratory, Batavia, IL

Lauten, G.
Fermi National Accelerator Laboratory, Batavia, IL

Oishi, K.
Shimizu Corporation, Tokyo,

Nakamura, T.
Tohoku Univ., Aoba, Aramaki, Aoba-ku, Sendai, Miyagi

(Received 31 May 2011; accepted 1 February 2012)

Abstract

The Japanese and American Study of Muon Interaction and Neutron detection (JASMIN) collaboration, has been conducting shielding experiments using the Fermilab anti-proton target station (Pbar) shielding assembly. A multi-foil technique was used to measure the high energy neutron spectra, in the range of 1 to 100 MeV, for the target station shielding configuration. The neutron spectra were de-convoluted using a new fitting method. This method is based on the assumption that a neutron spectrum can be expressed as a simple sum of two exponentials. The validity of the fitting method was confirmed by comparison with the results obtained using SAND-II computer code and theoretical calculations. Finally, it was found that there are simple correlations between reaction rates and the adjustable parameters in the fitting function.

Keywords:
high-energy neutron spectrum, GeV-protons, activation method, unfolding, PHITS

Paper ID: JAI104074
DOI: 10.1520/JAI104074
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