No abstract available

[en] The theoretical analysis for the threshold pion production has been performed by using the models of heavy-meson exchange and pion-rescattering including the effect of nucleon resonances. The d-wave pion production amplitude is discussed about the angular distribution of π⁰ production. The spin correlation observables give information about the partial wave amplitudes

[en] The pion production pn → ppπ^- and pp → ppπ⁰ are discussed. The theoretical analysis has been performed by using the models of heavy-meson exchange and pion-rescattering including the effect of nucleon resonances. The experimental data of the π^- production support the relative sign between the s-wave and p-wave pion-production amplitudes which is given by both of the two models. The d-wave pion production amplitude is discussed about the angular distribution of π⁰ production. The spin correlation observables give information about the partial wave amplitudes

[en] This issue is the collection of the paper presented at the title meeting. The 28 of the presented papers are indexed individually. (J.P.N.)

[en] At the ANKE facility of COSY Juelich, the reactions pp→ppφ and pn→dφ have been investigated. Data for the total cross section in the pp entrance channel have been obtained at excess energies of 19 MeV, 35 MeV and 76 MeV. In case of the pn entrance channel the energy dependence of the cross section up to 80 MeV has been extracted by exploiting the intrinsic momentum of the target neutron using a deuterium target. The new φ data combined with the existing data on ω-meson production provides the φ/ω production ratio in both, the pp- and pn-channels. The ratios of both channels are found to be similar and about eight times larger than the ratio based on Okubo-Zweig-Iizuka (OZI) rule

[en] γ-ray and electron radiolysis of solid phosphinate have been studied. Ferric phosphinate is easily decomposed by γ-rays with the ferric ion being reduced to ferrous ion. Whereas, iron of ferrous phosphinate is insensitive to irradiation up to a dose of 1700 Mrad. The decomposition of anion ligand (i.e. phosphinic acid) decreased with increasing oxidation number of the metal ion except for ferric phosphinate. Some decomposition products are P²-P² precursor in solid material. The precursor is hydrolyzed on dissolving in water and changes to the compounds, P³, P⁴-P², P⁴-P⁴, and P⁵

[en] At ANKE, the first data of φ-meson production in pp collisions close to threshold have been measured by detecting the K⁺K^- decay mode at beam energies of 2.83 GeV, 2.70 GeV and 2.65 GeV. About 200-300 events exhibit a clear peak in the mass region of the φ meson with the expected mass resolution ≤ 10 MeV (FWHM). The full analysis is now in progress. Our data at these energies combined with SPES-III and TOF results on ω production will provide the energy dependence of the φ/ω cross-section ratio for the isotriplet sector, in addition to the understanding of the reaction pp →ppφ near threshold. At ANKE data have also been collected data for φ-meson production in pn collisions at 2.65 GeV. The reaction pn→dφ has been identified by detecting the fast deuteron in coincidence with the K⁺K^- pairs from the φ decay using the deuterium cluster-jet target. Currently 750 events of φ-meson production have been identified from 30% of total data. The excess energy range from 30 MeV to 90 MeV is well covered for the pn→dφ system utilizing the Fermi momentum of the target neutron. The total cross section at several energies can be extracted at the same energy range as the pp channel. (orig.)

No abstract available

[en] The local barrier height (LBH) was measured on TiO₂(1 1 0) single crystal surfaces with and without Au deposition using scanning tunneling microscopy (STM). On the clean TiO₂(1 1 0) surface, the LBH values measured at (1x1) and (1x2) rows were almost the same, while the value at defect sites was much smaller. This indicates that the LBH of TiO₂ surfaces is dependent on the presence of topmost oxygen atoms. On the Au deposited surfaces, the LBH was dependent on the height of Au particles: the LBH of large particles (>0.4 nm in height) was about 0.3 eV larger than that of the substrate, whereas the LBH of small particles (<0.4 nm in height) was comparable to that of the substrate. The critical height of 0.4 nm for the LBH could be correlated with the metal-nonmetal transition of Au particles

[en] The diffusive permeability of potassium chloride, urea, and uric acid through cellophanes grafted with acrylamide, acrylic acid, styrene, and N-vinyl-2-pyrrolidone by γ-ray irradiation was studied. The diffusive permeability coefficients of the permeants through the grafted cellophanes were increased with increase in hydration of the grafted membranes, except for the permeation of potassium chloride through cellophanes grafted with acrylic acid. The permeation of potassium chloride, urea, and uric acid through the various grafted cellophanes is explained by the free volume concept of homogeneously water-swollen membranes. However, the behavior of the permeation of potassium chloride through cellophane grafted with acrylic acid deviated from that of nonionic membranes because of the contribution of the electrical interaction between electrolyte and charge of the membrane. 4 figures, 3 tables