The angular distribution for the breakup of 8B-->7Be+p on a 58Ni target has been measured at an incident energy of 25.75 MeV. The data are inconsistent with first-order theories but are remarkably well described by calculations including higher-order effects. The comparison with theory illustrates the importance of the inclusion of the exotic proton halo structure of 8B in accounting for the data.

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RECOIL RANGE.DISTRIBUTIONS 957Maxwelliam velocity distribution. 6 The reader should refer to Fig. 10 of their paper which compares these calculations to the collimated range data from this work. Qualitatively, the calculated and measured distributions are very similar. For a three-dimensional random walk of seven equal steps, the distribution is expected to be well represented by the Maxwellian function. 10 Thus we infer that most of the width of the spectrum of V arises from the threedimensional vector addition of velocities rather than 10 C. Hsiung, H. Hsiung, and A.The excitation energy of the first 2 + state in C 12 has been determined to be 4440.0±0.5 keV by means of the (p,p'y) reaction at 23 MeV incident proton energy, y rays were detected by a Ge(Li) detector in coincidence with inelastically scattered protons to reduce Doppler broadening. An anomaly in which a symmetrical doublet appeared in the 7-ray singles spectrum observed at 90° to the beam direction is explained on the basis of a coherent Doppler effect involving selective population of the magnetic sublevels of the 2 + state in the inelastic scattering process.

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