SPIN STRUCTURE OF NARROW PAIR CORRELATIONS OF IDENTICAL PARTICLES

Narrow pair correlations of identical particles with nonzero spin are studied. The spin structure of the correlation function for identical particles with close momenta is considered. Spin correlations associat ed with the effects of Bose and Fermi statistics and with final-state interaction are comprehensively analyzed in the model of independent s ingle-particle sources. Single- and two-particle polarization paramete rs are found as functions of the difference between the 4-momenta of i dentical particles. It is shown that, if the generation of two unpolar ized identical nucleons with close momenta is followed by the scatteri ng of one of these nucleons, spin correlation results in the polarizat ion of the other (unscattered) nucleon. This fact can, in principle, b e used to prepare nucleon beams with controllable spin polarization wi thout exerting any direct action on particles to be polarized. Other p ossible mechanisms of spin correlation are discussed.