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Radiation Protection Dosimetry Advance Access originally published online on May 13, 2007
Radiation Protection Dosimetry 2007 126(1-4):23-27; doi:10.1093/rpd/ncm007
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Development of a quasi-monoenergetic neutron field using the 7Li(p,n)7Be reaction in the energy range from 250 to 390 MeV at RCNP

S. Taniguchi1, N. Nakao2, T. Nakamura3,*, H. Yashima4, Y. Iwamoto5, D. Satoh5, Y. Nakane5, H. Nakashima5, T. Itoga3, A. Tamii6 and K. Hatanaka6

1 Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan
2 Fermi National Accelerator Laboratory, MS220, PO Box 500, Batavia, IL 60510-0500, USA
3 Cyclotron and Radioisotope Center, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
4 Research Reactor Institute, Kyoto University, Asashiro-nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
5 Japan Atomic Energy Agency, 2-4, Shirakata-Shirane, Tokai, Naka-gun, Ibaragi 319-1195, Japan
6 Research Center for Nuclear Physics, Osaka University, 10-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan

* Corresponding author: nakamura{at}cyric.tohoku.ac.jp

A quasi-monoenergetic neutron field using the 7Li(p,n)7Be reaction has been developed at the ring cyclotron facility at the Research Center for Nuclear Physics (RCNP), Osaka University. Neutrons were generated from a 10-mm-thick Li target injected by 250, 350 and 392 MeV protons and neutrons produced at 0° were extracted into the time-of-flight (TOF) room of 100-m length through the concrete collimator of 10 x 12 cm aperture and 150 cm thickness. The neutron energy spectra were measured by a 12.7-cm diam x 12.7-cm long NE213 organic liquid scintillator using the TOF method. The peak neutron fluence was 1.94 x 1010, 1.07 x 1010 and 1.50 x 1010 n sr–1 per µC of 250, 350 and 392 MeV protons, respectively. The neutron spectra generated from various thick (stopping length) targets of carbon, aluminium, iron and lead, bombarded by 250 and 350 MeV protons, were also measured with the TOF method. Although these measurements were performed to obtain thick target neutron yields, they are also used as a continuous energy neutron field. These neutron fields are very useful for characterising neutron detectors, measuring neutron cross sections, testing irradiation effects for various materials and performing neutron shielding experiments.


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