POLARIZATION OF XI-HYPERON AND OMEGA(-)-HYPERON PRODUCED FROM NEUTRALBEAMS

We have studied the polarization of Xi(-) and Omega(+) hyperons produc ed by high energy neutral particle beams. An unpolarized neutral beam striking a target at +/- 1.8 mrad produced 1.4 x 10(7) Xi(-)'s with an average momentum of 395 GeV/c which were unpolarized, within a sensit ivity limit of 0.007, and 2.2 x 10(5) Omega(-)'s with a polarization o f +0.042 +/- 0.007 at an average momentum of 374 GeV/c. A polarized ne utral beam striking a target at 0.0 mrad produced 7.1 x 10(5) Xi(-)'s which had a polarization of -0.118 +/- 0.004 at an average momentum of 393 GeV/c and 1.8 x 10(4) Omega(-)'s with a polarization of -0.069 +/ - 0.023 at an average momentum of 394 GeV/c. The polarized neutral bea m measurement is in good agreement with a previous measurement. The un polarized neutral beam results are not understood in the context of th e current models of hyperon polarization.