High order (n, xn), (n, xnyp), (p, xn) and (p, xnyp) reactions which do not play major role in conventional reactors because of their high threshold energy, may be important in hybrid systems like A.D.S. Study of these reaction is important for a wide range of applications like transmutation of long lived nuclear waste, high energy neutron spectrometry, validation of nuclear model codes, extension of the existing fuel cycles. In this book, an attempt has been made to understand the impact of various reactions channels which have definite probability of occurrence in the high energy neutron...