T. Wise

Analyzing powers and spin correlation coefficients for p+d elastic scattering at 135 and 200 MeV

The proton and deuteron analyzing powers and ten of the possible 12 spin correlation coefficients have been measured for p+d elastic scattering at proton bombarding energies of 135 and 200 MeV. The results are compared with Faddeev calculations using two different NN potentials. The qualitative features of the extensive data set on the spin dependence in p+d elastic scattering over a wide range of angles presented here are remarkably well explained by two-nucleon force predictions without inclusion of a three-nucleon force. The remaining discrepancies are, in general, not alleviated when theoretical three-nucleon forces are included in the calculations.

Measurement of the analyzing power A[N] in pp elastic scattering in the CNI region with a polarized atomic hydrogen gas jet target

The analyzing power AN for pp elastic scattering is expected to reach a peak value of 0.045 in the Coulomb Nuclear Interference (CNI) region at a momentum transfer −t of 0.003 (GeV/c). During the 2004 RHIC Run, we completed a measurement of AN in the CNI region by detecting the recoil protons from pp elastic scattering using a polarized atomic hydrogen gas jet target and the 100 GeV RHIC proton beam. We report the first measurements of the AN absolute value and shape in the −t range from 0.0015 to 0.010 (GeV/c) with a precision better than 0.005 for each AN data point. The recoil protons were detected with two arrays of Si detectors. The absolute target polarization as monitored by a Breit-Rabi polarimeter was stable at 0.924±0.018. This result allows us to further investigate the spin dependence of elastic pp scattering in the very low −t region.

Dependence of {rvec {ital p}}{rvec {ital p}} {r_arrow} {ital pp{pi}}thinsp{sup 0} near Threshold on the Spin of the Colliding Nucleons

A polarized internal atomic hydrogen target and a stored, polarized beam are used to measure the spin-dependent total cross section Delta_sigma_T/sigma_tot, as well as the polar integrals of the spin correlation coefficient combination A_xx-A_yy, and the analyzing power A_y for pp->pp pi0 at four bombarding energies between 325 and 400 MeV. This experiment is made possible by the use of a cooled beam in a storage ring. The polarization observables are used to study the contribution from individual partial waves.

Measurement of Partial-Wave Contributions in pp{yields}pp{pi}{sup 0}

We report a measurement of the spin-dependent total cross section ratios {delta}{sigma}{sub T}/{sigma}{sub tot} and {delta}{sigma}{sub L}/{sigma}{sub tot} of the pp{yields}pp{pi}{sup 0} reaction between 325 and 400 MeV. The experiment was carried out with a polarized internal target in a storage ring. Nonvertical beam polarization was obtained by the use of solenoidal spin rotators. Near threshold, the knowledge of both spin-dependent total cross sections is sufficient to deduce the strength of certain participating partial waves, free of any model. (c) 1999 The American Physical Society.

Measurement of spin correlation coefficients in p→p→→d π+

The spin correlation coefficent combinations

ABSOLUTE POLARIMETRY AT RHIC.

{A}_{\mathrm{xx}}{+A}_{\mathrm{yy}}

Design of a Polarized Atomic H Source for a Jet Target at RHIC

and

Spin correlation coefficients in from 325 to 400 MeV

{A}_{\mathrm{xx}}\ensuremath{-}{A}_{\mathrm{yy}},

Status and Operational Experience with the Polarized Hydrogen Jet at RHIC

the spin correlation coefficients

Polarization Measurements of RHIC‐pp RUN05 Using CNI pC‐Polarimeter

{A}_{\mathrm{xz}}