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The yields of  7 Be from  nat C,  27 Al,  nat Cu,  nat Ag and  197 Au targets and  10 Be from  nat Cu,  nat Ag and  197 Au targets in alpha- (400 MeV) and neutron- (maximum end-point energy,  E  0  = 500 MeV) induced reactions were measured in order to compare them with the photonuclear-reaction yields at  E  0  = 1000 MeV. The target-mass dependences of the yields of  7 Be and  10 Be showed very similar trends among alpha-, neutron-, and photon-induced reactions. The fragmentation yields of  7 Be decreased more slowly, and those of  10 Be increased gradually with an increase in the target mass; both yields intersected at an approximate target mass of 125. The exponential increase in the fragmentation-yield ratios of  10 Be to  7 Be with an increase in the neutron-to-proton ratio of the targets suggests that pre-formation of the fragments inside the excited nuclei is strongly influenced by the target properties, such as  N / Z . Furthermore, the effect of the incident particle was clearly observed in the yield ratios of  10 Be to  7 Be from the Cu and Ag targets.

Target dependence of beryllium fragment production in neutron- and alpha-induced nuclear reactions at intermediate energies