Polarization transfer in deuterium at intermediate energies

A set of experiments to determine the optimum polarization transfer parameter for the production of polarized neutron beams using the reaction D(p,n) 2p and to determine the optimum neutron production angle are described. Measurements of the variation of neutron polarization with energy at a neutron production angle of 9° in the lab. and of the analyzing power for neutrons of a polarimeter containing a 6 cm. thick carbon target are also described. The polarization transfer parameter R[sub t] was found to be about 5 times as large as the parameter D[sub t] for neutrons emerging at 9° in the lab. at 210 and 343 MeV incident proton energies, and of the same order as D[sub t] at 516 MeV. The neutron polarization peaked at about 10° at 210 and 343 MeV and was relatively insensitive to angle at 516 MeV. For neutrons emerging at 9°, R[sub t] was observed to decrease from -.94±.12 at 237 MeV to -.49±.07 at 516 MeV.Science, Faculty ofPhysics and Astronomy, Department ofGraduat

Detection efficiency of plastic scintillators for elastically scattered positive pions

The efficiency for detecting positive pions which have been scattered elastically from a target has been calculated for low pion energies. Measurements of the efficiency at pion kinetic energies 12 - 77 MeV were made for a 12" long x 5" diameter NE110 plastic scintillator optically coupled to a Philips XP1040 photomultiplier tube. The efficiencies varied from 94% at 12 MeV to 79% at 77 MeV.Science, Faculty ofPhysics and Astronomy, Department ofGraduat

Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets

A measurement of beam-helicity asymmetries for single-hadron production in deep-inelastic scattering is presented. Data from the scattering of 27.6 GeV electrons and positrons off gaseous hydrogen and deuterium targets were collected by the HERMES experiment. The asymmetries are presented separately as a function of the Bjorken scaling variable, the hadron transverse momentum and the fractional energy for charged pions and kaons as well as for protons and anti-protons. These asymmetries are also presented as a function of the three aforementioned kinematic variables simultaneously