Elastic scattering ofN-,L-, andS-type polarized 794 MeV protons from anND3target polarized in theS-Lplane

Abstract

23 p-d elastic scattering spin observables, most of them in linear combinations of two observables, were measured at 794 MeV over a range of four-momentum transfer t from -0.257 to -0.630 (GeV/c) .By changing the beam polarization between S, N, and L type and by alternating the target vector polarization between negative and positive, six independent combinations of beam and target polarization were obtained. The target was dynamically polarized deuterated ammonia. An average target polarization of 30% was achieved. Transverse polarization components of the scattered protons (S and N type) were measured directly by using a polarimeter. The longitudinal polarization component (L type) was measured after precessing it to N type. Typical uncertainties for two-spin coefficients were 0.02 and for three-spin coefficients 0.1 -0.2. The data are compared with the theoretical predictions calculated by fitting the previously available data to a relativistic multiple-scattering model with derivative couplings. Although relativistic impulse approximation calculations do not predict the data well, they are also included in the comparisons.PACS number(s): 25.40.Cm, 24.70.+s, 25.10.+s, 29.25.Pj

Sensitivity of the COSY dibaryon candidate tonpelastic scattering measurements

“…Triple-polarization measurements are extremely difficult and depend on the apparatus experimentalists have available. A typical case is described by Gülmez et al, at LAMPF which required the measurement of linear combinations of observables [20]. An observable translation guide is given in Table I.…”