The total yield and angular distribution of fast neutrons from bombardment of thick targets of pure Be, Al, Ti, Cr, Mn, Co, Cb, Mo, Ag, Cd, Ta, Au, Pb, and Bi by 15-Mev deuterons and 30-Mev alpha-particles was measured. These studies were made using the reaction S^i^p)? 32 as a threshold detector and also with fission ionization chambers. The total neutron yield per second per /.tamp of the cyclotron beam, N, was observed to decrease with increase in nuclear charge, Z, of the target according to the approximate empirical equations, logiV r =10.18-0.0234Z for deuteron bombardment and logiV=9.68-0.0234Z for alpha. In all cases studied, the angular distribution of fast neutrons from target bombarded by deuterons showed a pronounced peak in the yield in the forward direction.
EDITOR
459The initial condition on H is that it be uniform throughout all space. The boundary condition is that H have a value Ho independent of time on the surface of the cylinder (r-ro). The solution of Eq. (1) subject to these conditions isxfj exp(a n 2 u)fy(u)-l]rf«|. (2) Here, we have R~r/c\ 0 *, T**/)Ta 182 was measured 1 by the well-known stack foil technique. Forty 0.00025-in. thick (~10 mg/cm 2 ) Ta foils were bombarded with the deuteron beam from the University of Pittsburgh cyclotron. The energy of the Q 7 UJ UJ
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