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Measurement of 430-MeV/u carbon, nitrogen and oxygen incident neutron production cross sections for carbon

Shigyo, Nobuhiro*; Uozumi, Yusuke*; Itashiki, Yutaro*; Lee, J. E.*; Imatomi, Kosuke*; Kajimoto, Tsuyoshi*; Satoh, Daiki   ; Sanami, Toshiya*; Koba, Yusuke*; Matsufuji, Naruhiro*

Heavy ion cancer therapy has been increased by reason of its clinical advantages. During the treatment, the secondary particles are produced by nuclear reactions of a heavy ion incidence on a nucleus in a patient body. The neutron cross section data is essential for assessment of secondary cancer of patients as a source term. Accurate data in neutron energy around 1 MeV is required because neutron in that energy region has large relative biological effectiveness. We have measured the neutron double differential cross sections from carbon, nitrogen and oxygen ion incidences on a carbon target of neutron energy above 1 MeV in wide angular range from 15 to 90 degrees with 430-MeV/u. The experiment was performed at the PH2 course of Heavy Ion Medical Accelerator in Chiba (HIMAC), National Institute of Radiological Sciences. Experimental results of neutron double differential cross sections of carbon were obtained in energy range from 1 MeV to 600 MeV. From the comparison with the results calculated by PHITS code, it was found that PHITS reproduces the measured cross sections 100 MeV and slightly overestimates above the energy. The quantum molecular dynamics model, which is adopted in PHITS as a theoretical one for dynamical process of heavy ion induced nuclear reaction, would cause this disagreement. The results of the present work will help to improvement of the model.

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