M.W. McNaughton

The p-C analyzing power between 100 and 750 MeV

Abstract The inclusive p-C analyzing power has been measured for laboratory scattering angles between 3° and 19° for energies between 80 and 584 MeV. The experiment was performed at LAMPF using a large solid angle polarimeter. These data have been incorporated into the existing data base to obtain a new energy dependent p-C analyzing power fit for the energy range 100–750 MeV.

Measurement of the p-C analyzing power between 100 and 750 MeV and the p-Be analyzing power at 780 MeV

Abstract The inclusive p-C analyzing power has been measured for laboratory scattering angles between 4° and 25°, for energies between 100 and 750 MeV. The inclusive p-Be analyzing power has been measured at 780 MeV between 4° and 28°. The experiment was performed at LAMPF using a large solid angle polarimeter. An energy dependent empirical fit to these data as well as to data from SIN and TRIUMF is presented. The data from all three facilities are in generally good agreement.

Some proton spin observables obtained in p-d elastic scattering at 500 and 800 MeV

Abstract Measurements of the spin transfer observables D NN , D SS , and D LS in p + d → p + d at 500 and 800 MeV are reported. In addition we have measured the polarization, P , and the asymmetry A y . The data were taken in the range 0.2 t c ) 2 . Comparison of the observables is made with the predictions of a relativistic multiple scattering model employing the results of a recent phase shift analysis of NN scattering data.

ASL, ALL and ANO for NN → πD at 492, 729 and 796 MeV

Data on spin correlation parameters ASL, ALL and ANO for pp → π+d are reported at 492, 729 and 796 MeV. The 729 MeV ASL data are important in stabilising the amplitude analysis near that energy.

Polarization observables for the reaction pp→ppπ0 at 800 MeV

Abstract The Wolfenstein polarization observables DNN, D SΩ and D LΩ , where Ω denotes a mixture of S and L polarization components, the induced polarization P, and the analysing power A have been measured for the reaction pp→ppπ0 at 800, 733, and 647 MeV. Comparisons are made to theoretical predictions of the model of Dubach, Kloet and Silbar.

Spin transfer in 6Li(p, n) and7Li(p, n) at 800 MeV

The spin transfer parameters KLL and KNN have been measured for zero-degree neutron production from 6Li(p, n) and7Li(p, n) using 800 MeV incident protons. Since KLL ≈ −0.5 for both lithium isotopes, lithium is a potentially useful production target for polarized neutrons.

A large acceptance cylindrical drift chamber detector

Abstract This paper describes a large acceptance cylindrical drift chamber detector designed and built for the study of the np → pp π − reaction at neutron beam energies in the range 500–800 MeV. Details of construction, electronics, testing, and detection efficiencies and resolutions are presented.

LAMPF beam-line polarimeters

Abstract The beam-line polarimeters at the LAMPF accelerator are routinely used to measure all three components of the proton-beam polarization with an absolute accuracy of 1%. They have been cross-calibrated with a variety of polarimeters and polarized targets at the TRIUMF, PSI, and SATURNE accelerators. The design, performance, and calibrations are discussed.

Absolute differential cross-section measurements for p + p → π+ + d reaction at 500–800 MeV

Abstract Absolute differential cross sections for the reaction p + p → π + + d were measured at 491.9, 575.5, 641.6, 728.2 and 793.0 MeV. These measurements covered an angular range from 50° to 120° in c.m. except for the 491.9 MeV case, where the angular range was ∼70°–~105° in c.m. The beam intensity was measured by counting the individual beam particles using a scintillator beam-counting system. The typical accuracy for the beam counting was ∼0.1%. The uncertainty in the target length was about half a percent or lower. The overall uncertainty in the differential cross-section measurement was 1.5–2.5%, including the total systematic and statistical uncertainties. The results were compared with the existing data.

Systematic errors from an optically pumped polarized ion source

Abstract The systematic errors that arise in polarization measurements have been examined using the LAMPF optically pumped polarized ion source (OPPIS). Knowledge of these is important in planning precise experiments such as charge symmetry breaking or parity violation measurements.