Data are presen$ed op the inclusive production of 'II-k, p, and p for KS, and protons iicident on nuclear TI*, targets at 100 GeV. The results cover the kinematic range 30.5 P.sTEE ",,eIL;ved for Pt= 0.3 and 0.5 GeV/c. A-dependence of the invariant cross sections exhibits remarkable simplicity, which does not naturally. follow from current models of particle production. The results show that the hypothesis of limiting fragmentation can be extended to include collisions with nuclei.
We report the results of a polarized-2-beta-decay experiment carried out in the Fermilab Proton Center charged-hyperon beam. These results are based on 49 671 observed 2 -+ n e -V decays. The 2-beam had a nominal momentum of 250 GeV/c and was produced by 400-GeV/c protons impinging on a Cu target. At a production angle of 2.5 mrad, the polarization was (23.6f 4.31%. The decay asymmetries of the electron ( a , = -0.519+0.104), neutron ( a , = +0.509+0.102), and antineutrino (a,= -0.230f 0.061) were measured and used to establish sign and approximate magnitude of the axial-vector-to-vector form-factor ratio g , / f , . The form-factor ratios g , / f l / and f 2 / f were determined most sensitively from the neutron and electron center-of-mass spectra, respectively. We obtain 1 g , / f l -0.237g,/f1 =0.327i0.007i0.019 and f , ( O ) / f , ( 0 ) = -0.96 f0.07k0.13, where the stated errors are statistical and systematic, respectively. A general fit that includes the asymmetries and makes the conventional assumption g , =O gives the final value g , ( O ) / f , ( 0 ) = -0.328k0.019. The data are also compatible with positive values for g , / f , combined with corresponding reduced values for g , / f , / .
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