Showing papers by "W. Meyer published in 2002"
TL;DR: The development, in the early 1960s, of the dynamic nuclear polarization scheme in solid diamagnetic materials, doped with paramagnetic radicals, led to the use of solid polarized H and D targets in numerous nuclear and particle physics experiments.
54 citations
TL;DR: The helicity dependence of the gamma-->p-->-->-->ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV.
Abstract: The helicity dependence of the (γ) over right arrow(p) over right arrow -->ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment, performed at the Mainz microtron MAMI, used a 4pi -detector system, a circularly polarized, tagged photon beam, and a longitudinally polarized frozen-spin target. These data are predominantly sensitive to the D-13(1520) resonance and are used to determine its helicity amplitudes.
53 citations
TL;DR: In this paper, the helicity dependence of the photon-energy range from 550 to 790 MeV was measured for the first time in the photon energy range at the Mainz microtron MAMI.
Abstract: The helicity dependence of the $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}}\stackrel{\ensuremath{\rightarrow}}{p}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}$ reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment, performed at the Mainz microtron MAMI, used a $4\ensuremath{\pi}$-detector system, a circularly polarized, tagged photon beam, and a longitudinally polarized frozen-spin target. These data are predominantly sensitive to the ${D}_{13}(1520)$ resonance and are used to determine its helicity amplitudes.
53 citations
TL;DR: In this article, a transversely polarized frozen-spin target and a beam momentum of 1.637 GeV/c were used to measure the spin-transfer observables D n n and K n n (the normal to normal depolarization and polarization transfer).
Abstract: Spin-transfer observables for pp → ΛΛ have been measured using a transversely polarized frozen-spin target and a beam momentum of 1.637 GeV/c. Current models of the reaction near threshold are in good agreement with existing measurements performed with unpolarized particles in the initial state but produce conflicting predictions for the spin-transfer observables D n n and K n n (the normal-to-normal depolarization and polarization transfer), which are measurable only with polarized target or beam. Measurements of D n n and K n n presented here are found to be in disagreement with predictions from these models.
14 citations