Monoergic deuterons from the Minnesota electrostatic generator were used to bombard a thin gaseous target of He 3 . Protons formed in the reaction He 3 (d,p)He i were detected outside the reaction chamber by a Nal scintillation counter. The cross section for the reaction He 3 (d,^)He 4 was measured between the angles of 15° and 130° in the laboratory at deuteron energies of 0.260, 0.455, 0.978, 1.51, 2.01, 2.50, 3.01, and 3.56 Mev. The cross section was measured at a fixed angle of 86° for deuteron energies from 240 kev to 914 kev. A maximum occurred at a deuteron energy of 430±30 kev. The cross section appears to be isotropic in the center-of-mass system in the neighborhood of the maximum. The value of the total cross section at the maximum is 0.90db0.10 barn. Comparison of this value with the upper bound provided by the single level dispersion formula indicates that the spin of the compound state of Li 5 formed in the reaction is f. At 978 kev there is a slight angular dependence of the cross section, which becomes more pronounced at higher energies. At 2.50 Mev the cross section displays a minimum at approximately 113°. At 3.01 Mev the minimum has shifted to 108°, and at 3.56 Mev it appears at 103°. * Supported by the joint program of the U. S. Office of Naval Research and the U. S. Atomic Energy Commission.t.

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The efficiency of the nuclear reaction C n (p, y)W 3 has been measured over the energy range from 125 kev to 200 kev, with results which are in good agreement with those recently published by Hall and Fowler. The cross section ranges from 1.0X10 -33 cm 2 at 128 kev to 23X10 -33 cm 2 at 194 kev. The thick-target yield of the reaction was measured, by detecting the N 13 positron activity with an absolutely calibrated counter, and the cross sections were obtained by differentiation of the thick-target yield curve.

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