[en] A preliminary analysis of an experiment designed as a sensitive dibaryon resonance search in the reaction pp→pπ⁺n is presented. At 2 GeV/c incident momentum, 440,000 unambiguously reconstructed events were obtained. In this preliminary analysis, the results are reported of a search of the pn mass spectrum for evidence of chain decays of possible dibaryon resonances, i.e. pp→d/sup **/, d/sup **/→d/sup **/π⁺, d/sup */→pn. No evidence of narrow peaks (less than or equal to 7 MeV) is seen in the data for cross-section-times-branching-ratio greater than 50 μb

[en] The catalytic subunit of the cAMP dependent protein kinase was purified 100-fold from tick salivary glands. The enzyme mechanism of the phosphotransferase reaction catalyzed by this subunit was investigated. Highly purified enzyme did not show ATP-ase activity in the absence of protein substrates. Initial velocities were measured using histone H-1 or a synthetic heptapeptide, Kemptide, as P/sub i/ acceptors and (γ-³²P) ATP as a phosphodonor. Patterns were consistent with a sequential, but not a ping pong mechanism. At high concentration (>2Km), histone showed substrate inhibition which was noncompetitive versus ATP. Product inhibition by Mg.ADP was competitive versus ATP and noncompetitive with respect to H-1. Phosphohistone on the other hand was noncompetitive with respect to H-1, but gave parabolic competitive inhibition against ATP. Dead-end inhibition by AMP-PNP, an analogue of ATP, was competitive and noncompetitive against ATP and H-1, respectively. The inhibitory of cAMP dependent protein kinase was noncompetitive with ATP and competitive with histone. These studies strongly suggest that the tick salivary gland protein kinase has a sequential mechanism with primarily ordered addition of ATP followed by protein substrate and ordered release of phosphoprotein and ADP, but some random character

[en] Preliminary results from a sample of approx. 20,000 events of the reaction pp→pωp obtained using the ZGS 11.75-GeV/c polarized proton beam and the Effective Mass Spectrometer are presented. An enhancement in the ωp mass distribution with mass 1.810 +- 0.025 GeV and width 0.140 +- 0.040 GeV is observed. The t distribution of this enhancement shows a pronounced dip near -t = 0.2 GeV²; this dip suggests that the production mechanism is mostly ω-exchange. The decay angular distributions are consistent with a spin-parity of 2^3-. 4 figures

[en] The jet target, the superconducting spectrometer, and the polarimeter used to measure the recoil proton polarization in an Indiana University experiment at the Fermi National Accelerator Laboratory are described. Analysis procedures and data checks are explained, and preliminary results are presented and compared with model predictions. The future plans for the experiment are also discussed

[en] Samples of the reaction p/sub arrow-up/ p→pωp, consisting of 20 000 and 1000 events at 11.75 and 6 GeV/c, respectively, were obtained using the Zero Gradient Synchrotron polarized proton beam and the Effective Mass Spectrometer. A narrow enhancement near threshold is seen in the ωp mass distribution. The t distribution of this enhancement shows a pronounced dip near t = -0.2 GeV² at both beam momenta, suggesting that ω exchange is the dominant production mechanism. The joint-decay-angular-distribution moments and polarization correlations have been determined as functions of ωp mass. Amplitude analysis of these moments indicates that the low-mass enhancement is due to the high-mass tails of spin-parity 3/2^- and 3/2⁺ states below ωp thresholds. Polarization correlations consistent with zero provide evidence for the lack of resonant behavior in the low-mass enhancement itself

[en] We have obtained 1400 events of the baryon-exchange reaction pp→ßpK⁺ using the ANL zero gradient synchrotron 11.75-GeV/c polarized proton beam and the effective-mass spectrometer. A search for enhancements in the ßp mass spectrum has been made. No enhancements are observed; in particular the narrow ßp enhancement at 2.13 GeV seen in K^-d→ßpπ^- is not observed. We establish limits on the production of narrow states of approx.10 nb. Also 100 000 events of the forward reaction pp→ßK⁺p were examined and no narrow ßp enhancements are seen

[en] We present density-matrix elements and single-spin correlations for the reaction p/sub up-arrow/p→pπ⁺n at 3, 4, 6, and 11.75 GeV/c, using both longitudinal and transverse beam polarizations. For small momentum transfers, the spin correlations are mainly due to off-shell π⁺p elastic scattering, while for larger t there are large polarization effects associated with the production dynamics for p/sub up-arrow/p→Δ/sup ++/n. Comparison of longitudinal and transverse polarization correlations suggests that the Δ/sup ++/-production spin effects are due mainly to unnatural-parity exchanges. We present a model-dependent amplitude analysis, and extract the energy dependence of the natural- and unnatural-parity-exchange contributions

[en] A search was made for five-quark ''pseudobaryon'' and four-quark baryonium states with a 1000-event sample of the reaction pp→ppp-barp at 11.75 GeV/c. For states with widths < or approx. =10 MeV/c² and masses M/sub p/p<2.2 Gev/c² and M/sub p/pp-bar<3.4 GeV/c², upper limits on the product of the cross section and the branching ratio for forward-hemisphere production are measured to be approx.15 nb

[en] 15 000 events of the reaction p_arrow-upp→pK⁺K^-p were obtained at 11.75 GeV/c using the Zero Gradient Synchrotron polarized proton beam and the Effective Mass Spectrometer. This event sample includes 1500 events of p_arrow-upp→pphip. The characteristics of phi production are examined. The t distribution is found to be quite shallow (exponential slope parameter 3.3 GeV^-2). The cross section for phi production is compared to that for pp→pωp measured in the same apparatus. A ratio of phi/ω cross sections of 0.010 +- 0.002 is found, substantially larger than the value of 0.002 predicted by the Okubo-Zweig-Iizuka rule. Upper limits are set for the production of narrow states, possibly of a qqqqq-bar quark composition, decaying into phip,K⁺K^-p, or K⁺Y*

[en] Results are presented from an experiment conducted at Fermilab to measure the polarization parameter in p-p elastic at momenta between 20 and 200 GeV/c at vertical-bar t vertical-bar values between 0.3 and 1.0 (GeV/c)². Recoil protons from the interaction of the circulating Fermilab beam and a hydrogen gas jet were spin analyzed in a carbon polarimeter and significant polarizations were observed. The results are compared with the predictions of exchange models