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End to the Cosmic-Ray Spectrum?

the optical parameters (Table I) found so far to give the best fit to the elastic polarization also produce the best prediction of inelastic asymmetry. All the curves in Fig. 2 use a central-well deformation parameter of /02=0.39 for 'Si and 2= 0. 22 for ZNi. The deformation parameter of the spin-orbit term is 1.5 times the central- well value, which produces slightly better agree- ment with the asymmetry data for 28Si. Both real and imaginary parts of the spin-orbit in- teraction are included, but since I WSI<<VS, the imaginary part makes little difference. The curves also include Coulomb-excitation amplitudes,' which make little difference in either the asymmetry or the cross section. We find that for all of the calculations made, the predictions of inelastic asymmetry and inelastic polarization are very nearly identi- cal. In summary we find that, provided the imag- inary and spin-orbit terms are included, the collective-model generalization of the optical potential gives a good account of the present inelastic asymmetry data at all but the most forward angles. It is quite possible that a more comprehensive treatment of the spin-de- pendent interaction will improve matters in this region, and such calculations are in pro- http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

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