Activation measurement of neutron distribution in intermediate energy heavy ion target area

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The distribution of neutrons produced by the reaction of 50 MeV/u 12 C ion on a thick Cu target are studied.The neutrons are measured with threshold activation detectors. Al, F, C, Al and In activation samples were used to measure neutrons with energy greater than 7, 11, 20, 50 MeV and thermal neutrons,respectively. The fluence rate, energy and angular distributions of neutrons, total neutron yield of 12 C ion and the emission rate in the forward direction of neutrons over 11 and 20 MeV were obtained.