Neutron production from targets of Be, C, Mo, Cu, Ta and Au bombarded with deuterons of 16, 33 and 50 MeV has been studied at the isochronous cyclotron at Louvain-la-Neuve. Neutron spectra were measured by the time of flight method. The yields of neutrons and gamma rays were also measured, and the greatest ratio of neutrons to gamma rays in the forward direction was found to occur with 50 MeV deuterons on a Be target. The angular distribution of neutrons from Be was measured at 16, 33 and 50 MeV, and neutron spectra were measured as function of angle with 50 MeV deuterons on Be.

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sible reason for this overestimation is the omission of reaction effects in the calculation. Another possible reason is the fact that, because the nucleon separation energy for 3 He is rather small, the low-density region of the 3 He wave function is not given well 8 by the Gaussian form 1 used in the calculation, 9 and one would expect this region to be important in backward-peaked exchange phenomena. In order to test this latter hypothesis in a rather crude fashion, the calculation was performed with the rms matter radius of the 3 He cluster arbitrarily increased to 1.89 F, and the result is shown as a dashed curve in Fig. 2. The improved agreement with experiment suggests that to explain the present data it is important to describe properly the long-range parts of the cluster wave functions. This could be done, for example, by employing a two-Gaussian description for the 3 He wave function such as has been done for the deuteron wave function in a recent study of the a + d system. 10 We wish to thank Professor Y. C. Tang for valuable discussions concerning the resonatinggroup method and its application to the present experiment. We are indebted to R. W. Rutkowski for providing the gas target. We are also very grateful to A. Riikola and the cyclotron operators for their expert running of the accelerator and for the dispatch with which they carried out the The residual polarization of negative muons in the ground state of muonic atoms with nuclear spin 7 = 0 was extensively studied both experimentally and theoretically; the spin-orbit coupling during the muonic cascade causes a strong spin depolarization. 1 Little is known on the residual polarization in muonic atoms with 7^0 where, in addition to the spin-orbit coupling, the hyperfine coupling between the muon and the nucleus will affect the depolarization. Hoping to obtain some indications about the role played by the hyperfine (hf) interaction in the spin depolarization in rau-energy changes.

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