[en] The success of S anti ppS detectors in isolating interesting parton-parton collisions clearly from the less interesting beam-beam background has made the prospect of TeV-I physics even more exciting because of the higher energy and higher luminosity that TeV-I is designed to deliver. In this report, discussion are focussed on important physics with CDF which are possible only at the higher energy and higher luminosity. Among those are testing the gauge structure of the electro-weak interaction, probing the compositeness scale of quarks, and studying W-decay channels with increased statistics. Investigations made include transverse momentum distribution, invariant mass distribution, energy flow distribution, rapidity distribution, and Drell-Yan cross sections. Results are described and discussed. The standard model has been established to a surprising degree by S anti p pS. That the observed masses of W and Z come within less than 10 % of the prediction has created more misteries on symmetry breaking mechanism. It is absolutely the must of TeV-I to go beyond the standard model. Since the Higgs discovery seems almost hopeless at CDF, alternates must be looked for somewhere else, namely the gauge coupling structure, compositeness, and SUSY. (Nogami, K.)

[en] CDF accumulated a significant amount of data for the first time in the early months of 1987. The integrated luminosity used for data taking reached 34 inverse nano-barns by the time the Tevatron terminated its collider-mode operation on May 11. Early examination of the data indicates a rich concentration of W and Z events as well as high transverse-momentum jets. (author)

[en] It is proved that two-dimensional spin-1/2 XYZ models can be mapped onto generalized Ashkin-Teller models, in the first approximation of a realization of the decomposition scheme proposed by Suzuki. Consequently, it is shown that a large class of quantum spin models can be investigated analytically within the present approximation. Some analytic and numerical results are explicity obtained with respect to thermal and critical properties in some interesting cases. It is also pointed out that the present mapping suggests a procedure to overcome the well-known negative sign problem in performing Monte Carlo calculations of frustrated quantum spin models

[en] Preliminary results on physics analyses based on the 1987 experiment by the Collider Detector at Fermilab (CDF) are presented. Since all of the results presented in this paper are currently under preparation for the publication, only an overall picture is given. The data agree well with the standard model predicted at the center of mass energy of 1800 GeV in proton-antiproton collisions. With the integrated luminosity of approximately 32 nb^-1 of the 1987 run, observation of any significant deviation from the standard model requires further analysis

[en] Magnetic properties of the one-dimensional spin-orbital model are investigated in a dimer-singlet phase. By means of the density matrix renormalization group method, we calculate the magnetization curve and the correlation functions in a magnetic field. It is found that a cusp singularity appears in the magnetization process when the ratio of the exchange couplings is properly tuned. The origin of the cusp singularity is discussed

[en] The multifilamentary Nb₃Sn superconducting wires with the titanium addition have been fabricated by internal tin diffusion process to improve critical current density (J /SUB c/ ) at high fields (>12T). The wires fabricated have seven modules in a copper matrix. The module is composed of the Sn-2wt%Ti alloy core instead of the tin core at the center and 90 niobium filaments located by three layers around the Sn-Ti core. The wire heat-treated at 675⁰ C for 168hr shows a high overall J /SUB c/ of 7.5 X 10⁴A/cm² at 12T and 3x10⁴A/cm₂ at 16T. The J /SUB c/ is further improved by increasing titanium content in the core, and the wire with Sn-2.5wt%Ti core has a J /SUB c/ of 8.2x10⁴A/cm² at 12T. The observation by electron probe microanalizer (EPMA) indicates that the amount of titanium dissolved in the Nb₃Sn layer depends on the location of filaments. The filaments close to the center of a module have maximum titanium amount of about0.5wt% titanium in the Nb₃Sn layers. The results indicate that Nb₃Sn wire using Sn-Ti cores is one of the most favorable superconductors for high field applications

[en] The authors have synthesized the single phase samples of Cu_xC_0.1Ba₂Ca₃Cu₄O_z (x = 0.2∼0.9). Transport and magnetic measurements and iodometric titration analysis were carried out for these materials. From these results they discuss the correlation between Tc, the Hall number, copper valence and oxygen content. The effect of the substituted M ions on Tc in (CuC, M)-1234 (M = Ni,Zn,Al,Tl,Mg) is also discussed. They propose a unique selective carrier-doping mechanism in (Cu,C)- and (CuC, Mg)-1234 systems

No abstract available

[en] An approximate wave function of the ground state of the spin 1/2 XY magnet is derived using a variational method. This wave function yields estimates of the ground state energy and long range order which agree very well with the results obtained by Betts and Oitmaa by a finite lattice method. (author)

[en] The heat treatment process was investigated for the multifilamentary Nb₃Sn wires fabricated by internal tin diffusion method. The authors adopted the new process (rapid heating) without conventional heat treatment (multi-step heating). The rapid heating was performed by putting the as-drawn wires rapidly into a furnace kept at 675 degrees C in an Ar atmosphere. The obtained Nb₃Sn wire heat-treated at 675 degrees C for 160h by the rapid heating has almost 10% higher J_c than that by the multi-step heating. From the results of observation of microstructure the grains in the Nb₃Sn filaments for the wire by the rapid heating were finer than those by the multi-step heating. The authors suppose that the formation of Nb₃Sn filaments with fine grains would bring about the improvement of J_c of the wire by the rapid heating