Quark-meson coupling model with short-range quark-quark interactions

Short-range quark-quark correlations are introduced into the quark-meson coupling (QMC) model phenomenologically. We study the effect of the correlations on the structure of the nucleon in dense nuclear matter. With the addition of correlations, the saturation curve for symmetric nuclear matter is much improved at high density.Comment: 6 pages (including 4 figures), to be published in Prog. Theor. Phys. (Kyoto) vol.105, no.2 (2001

Variation of hadron masses in finite nuclei

Using a self-consistent, Hartree description for both infinite nuclear matter and finite nuclei based on a relativistic quark model (the quark-meson coupling model), we investigate the variation of the masses of the non-strange vector mesons, the hyperons and the nucleon in infinite nuclear matter and in finite nuclei.Comment: 4 pages plus one ps file, to appear in Proc. of International Symposium on Non-Nucleonic Degrees of Freedom Detected in Nucleus (NNDF '96) at Osaka, Japa

Self-consistent description of finite nuclei based on a relativistic quark model

Relativistic Hartree equations for spherical nuclei have been derived from a relativistic quark model of the structure of bound nucleons which interact through the (self-consistent) exchange of scalar ($\sigma$) and vector ($\omega$ and $\rho$) mesons. The coupling constants and the mass of the $\sigma$-meson are determined from the properties of symmetric nuclear matter and the rms charge radius in $^{40}$Ca. Calculated properties of static, closed-shell nuclei from $^{16}$O to $^{208}$Pb are compared with experimental data and with results of Quantum Hadrodynamics (QHD). The dependence of the results on the nucleon size and the quark mass is investigated. Several possible extensions of the model are also discussed.Comment: 37 pages, 17 postscript figures are included, uses epsfig.sty, uuencoded Z-compressed .tar file (uufiles

Seasonal Variation of Arbuscular Mycorrhizal Fungal Colonization for Coexisting Plant Species in Miscanthus-Type Semi-Natural Grassland

Symposium Pape

Diffusion of Silicon and Manganese in Liquid Iron. I : Diffusion in Liquid Iron Saturated with Carbon

Diffusion coefficients of silicon and manganese in liquid iron (carbon-saturated) were determined in temperature range between 1, 300°and 1, 600°by the method of so-called semi-infinite medium. Blank values accompanied with the measurement of diffusion in liquid state were examined and the following results were obtained : (i) Diffusion coefficients of silicon in Fe-C (saturated)-Si(1.5%) alloys can be expressed as follows : log D (cm^2sec^) = -3.62 - 0.179 × 10^4/T, activation energy Q = 8.2 kcal/g・atom. (ii) Diffusion coefficients of manganese in Fe-C(saturated)-Mn(2.5%) alloys can be expressed as follows : log D (cm^2sec^) = -3.71 - 0.127 × 10^/ T, activation energy Q = 5.8 kcal/g・atom

K-Ar biotite ages of the coarse-grained granites from the Inada area, Ibaraki Prefecture: Evaluation of suitability for a new K-Ar dating standard

K-Ar ages have been determined on biotite fractions of three coarse-grained granites from the Inada area, Ibaraki Prefecture. Ages are 65.0 +/－ 2.3 Ma for Inada-I, 63.7 +/－ 2.2 Ma for Inada-II and 62.1 +/－ 2.8 Ma for Inada-III. The Inada-II sample is a better candidate than the other two samples as a K-Ar dating standard on the basis of thin section observation and K-Ar dating results. However, a chlorite removal step is necessary to make the new dating standard