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We measured the analyzing power A and the spin-spin correlation parameter A nn , in large-Pi proton-proton elastic scattering, using a polarized-proton target and the polarized-proton beam at the Brookhaven Alternating-Gradient Synchrotron. We also used our polarimeter to measure A at small P] at 13 GeV with good precision and found some deviation from the expected 1/P| ab behavior. At 18.5 GQV/C we found A m = ( -2 ± 16)% at P\ =4.7 (GeV/c) 2 . Comparison with lower-energy data from the Argonne Zero-Gradient Synchrotron shows a sharp and surprising energy dependence for A m at large P\.

HUNT, POPE, FRECK, AND EVANS the square of the quoted errors. These are shown in Table II, together with the values obtained by other workers for comparison. Bondelid's values are very closely similar to the values which we obtained relative to the 340.4-kev resonance determination and are consequently approximately one part in a thousand lower than our best mean values. The constancy of the discrepancy is consistent with both scales being linear to a few parts in ten thousand.Comparison with Bumiller and Staub's results shows that their values are 0.6/10 3 lower than ours for the lowest energy and about 0.8/10 3 lower at the higher energies, but 2.6/10 3 lower for intermediate energies. This is not consistent with both scales being accurately linear.Heavy-ion beams of fixed initial energy (E°/w« 10 Mev/amu) are passed through aluminum absorbers of known thickness, and the emergent ions are analyzed by means of a magnetic spectrograph to determine their charge and energy distributions. Accurate measurements of the mean emergent ion energy as a function of absorber thickness are reported for beams of He 4 , B 10 , B 11 , C 12 , N 14 , O 16 , F 19 , and Ne 20 ions with emergent energies in the range 10 >E/m>l Mev/amu. The results can be interpreted as measurements of the range-energy relation for heavy ions. While the absolute accuracy of the range measurements is approximately ±1 mg/cm 2 , the range difference R(E°)-R(E) is measured (as a function of E) with a typical accuracy of ±0.1 mg/cm 2 . In the analysis the shape of the heavy-ion range-energy curve is compared with the accurately known shape of the proton range-energy curve (using the conversion factor AR = mZ p 2 (m p Z 2 )~1ARp) and 2 S.

We have measured the spin-transfer parameters K«, KsL, KLs, and Kss at 788 MeV from 47 to 177' c.m. , and also uncovered a 10 -16 /o normalization discrepancy which affects all previous np elastic spin data from LAMPF. Results disagree significantly from previous phase-shift predictions. With the inclusion of these new data the NN phase shifts and amplitudes (isospin 0 and 1) become well determined for the first time near 800 MeV.