By C. D. Jeffries (auth.), Professor Dr. Karl-Heinz Althoff, Priv. Doz. Dr. Werner Meyer (eds.)
The ninth foreign Symposium on excessive strength Spin Physics, held in Bonn, 6-15 September 1990, attracted 280 members from sixteen nations. This meet ing lined not just basic experimental and theoretical spin phenomena but additionally technological advancements in polarized beams and pursuits. For the 1st time intermediate power spin physics with electron machines was once mentioned greatly. Highlights integrated the paintings on polarized excessive strength electron beams at LEP and TRISTAN and the failure of the traditional version in reference to spin phenomena, specifically the expansion of the spin asymmetry in violent proton-proton scattering. additionally the presentation of other versions in con nection with the still-unsolved 'proton spin trouble' and the proposals for 4 diversified experiments to figure out the spin constitution capabilities brought on energetic and infrequently debatable discussions. The Organizing Committee want to thank all audio system for his or her excel lent talks, the conveners for the association of the parallel classes, and the overseas Advisory Committee for his or her suggestion. 4 workshops preceded the symposium. a hundred and sixty contributors, between them many younger physicists, mentioned normally technological spin difficulties. those papers are released in separate complaints. We gratefully recognize the enthusiastic aid of the participants of our institute in getting ready and working the convention and the workshops, specially Mrs. D. FaSbender, Mrs. E. Wendorf, Mrs. J. Wetzel, and Dr. U.Idschok.
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Gorter (North Holland, 1964), p. 384. 1. Solomon, in Magnetic Resonance and Relaxation, ed. J. Schmidt (North Holland, 1963), p. 25. M. Borghini, Phys. Rev. Lett 20, 419 (1968). M. Borghini, in Proc. Int. · on Polarized Targets, ed. G. Shapiro (Berkeley, 1971), p. 1. W. de Boer, J. Low Temp. Phys. 22, 185 (1976). s. F. J. Cox, V. Bouffard, and ~ Goldman, J. Phys. C ~, Ll00 (1973). A. , Phys. Lett. 2, 310 (1962). Full detailS-or-this target are-given in ref. 29, p. 446-ff. A. Abragam, M. Borghini, and M.
However, when the spins are antiparallel the behavior is very different; the cross-section just keeps dropping. This was a most surprising result when we first found it in 1977. In simple language the protons appear to have violent collisions only when they are spinning in the same direction; when they spin in opposite directions they seem to just pass through each other. The factor of four difference between the two spin cross-sections was totally unexpected. This large spin effect caused confusion for people who believed in Perturbative Quantum Chromo dynamics, because it appears impossible to get such a large spin effect from PQCD alone.
D. Jeffries, Phys. Rev. 127, 51 (1962). J. H. Van Vleck, Phys. ~, 426 (1940); Phys. Rev. 59, 724 (1941). R. Orbach, Proc. Roy. Soc. (LOndon) A264, 456 (1961). T. J. Schmugge and C. D. Jeffries, Phys. Rev. 138,'A1785 (1965). T. E. Gunter and C. D. Jeffries, Phys. Rev. 15g;-290 (1967); C. D. Jeffries, in Proc. I·nt. Conf. on Polarized Targets and Ion Sources (Saclay, 1966), p. 95. C. D. Jeffries, In Polarization Phenomena in Nuclear Reactions, eds. H. H. Barshall and W. Haeberli (Univ. of Wisconsin Press, Madison, 1971), p.
