Formation of Essential Kaonic Nuclei, “K − pp”

We have reviewed our theoretical calculations of the formation of a deeply bound K ^? pp state with I = 1/2, J ^π  = 0^? by the ³He(in-flight K ^?, n) reaction at ${p_{K^-} = 1.0}$ rm GeV/c and θ _lab = 0° for the forthcoming J-PARC E15 experiment. The expected inclusive and semiexclusive spectra have been calculated within the framework of a distorted-wave impulse approximation using the Green’s function method. The advantage of the use of the ³He target for the ³He(K ^?, N) reactions are emphasized.     

Synthesis,crystal structure,and <Superscript>1</Superscript>H NMR spectra of a chloride-bridged chain complex of dinuclear ruthenium(II,III) 3,4,5-tri(ethoxy-<Emphasis Type="Italic">d</Emphasis><Subscript>5</Subscript>)benzoate

Deuterated dinuclear ruthenium(II,III) 3,4,5-tri(ethoxy-d ₅)benzoate, [Ru₂{3,4,5-(C₂D₅O)₃C₆H₂-COO}₄Cl] _n , was synthesized by a reaction of [Ru₂(C₂H₅COO)₄Cl] _n and 3,4,5-tri(ethoxy-d ₅)benzoic acid and characterized by single-crystal X-ray analysis as well as IR, UV-VIS, and ¹H NMR spectra, and compared with those of the undeuterated complex [Ru₂{3,4,5-(C₂H₅O)₃C₆H₂COO}₄Cl] _n . Single-crystal X-ray analysis showed that chloride ligands bridge the dinuclear ruthenium(II,III) units at the axial positions to form a zigzag chain molecule with the Ru¹-Cl-Ru² angle of 123.82(4)°. ¹H NMR spectra in CD₂Cl₂ displayed a broad signal attributable to o-H atoms on the phenyl rings of the benzoate ligands from approximately δ = 23 to δ = 32 at 25°C and several signals from approximately δ = −50 to δ = 50 at −80°C. These spectra show the preservation of the polymeric or oligomeric chain structure in dichloromethane, which is supported by the solution behavior confirmed by the UV-VIS spectra and electronic conductance.     

Anticorrelated bidirectional output of quasistadium-shaped semiconductor microlasers

Time-domain properties of the output from quasistadium-shaped microcavity semiconductor lasers are studied. Ring modes generating a bidirectional output are selectively excited by partial pumping. We observe a high anticorrelation between the two beams output from the ring modes. This can be considered as the generalization of alternate oscillations reported previously. We find that the outputs exhibit a robust slow modulation of 4–10 MHz, and explain it by the quasi-degeneracy of the resonator modes.     

Synthesis and magnetic properties of polymeric complexes containing ruthenium(II)-ruthenium(III) tetracarboxylato units linked by cyanato,thiocyanato, and selenocyanato ligands

Polymeric complexes of ruthenium(II)-ruthenium(III) tetracarboxylato units linked by cyanato, thiocyanato, and selenocyanato ligands [Ru₂{O₂C(CH₂)_mCH₃}₄(L)] _n (m = 0, 4–7; L = OCN⁻, SCN⁻, and SeCN⁻) were prepared and characterized based on the elemental analyses, IR, and diffuse reflectance spectra. Magnetic susceptibilities were measured at the temperature range of 4.5 K to 300 K, where the interdimer antiferromagnetic interactions were revealed. The strongest interaction was exhibited in case of m = 7 and L = OCN⁻. ¹H-NMR spectra of [Ru{O₂C(CH₂)₇CH₃}₄(SCN)] _n in CD₂Cl₂ showed broad signals which can be ascribed to polymeric species, as the addition of tetrabutylammonium thiocyanate caused sharper signals due to the formation of [Ru₂{O₂C(CH₂)₇CH₃}₄(SCN)₂]⁻ adduct as the main species in the solution. Dedicated to Professor Milan Melník on the occasion of his 70th birthday     

Improvement of Laser-Beam Irradiation-Intensity Distribution Using Multi Lens Array and Edge-Shaped Plates

A new concept for improving the laser intensity distribution on an inertial confinement fusion target using a phase-controlled multi lens array has been proposed. Circular and hexagonal element lens apertures have been examined, and the circular aperture which eliminated azimuthally asymmetric intensity distribution was chosen. The diffraction fringe of the elementary lens was mitigated in a one-dimensional lens array using edge-shaped plates of a super-Gaussian phase profile. Uniform beam profiles were obtained using a one-dimensional array with 7 spherical lenses and a two-dimensional array with 37 lenses. An approximately flat-top intensity distribution was realized with the lens array with 37 lenses.     

Electronic transport properties of the Ising quantum Hall ferromagnet in a Si quantum well

Magnetotransport properties are investigated for a high mobility Si two-dimensional electron system in the vicinity of a Landau level crossing point. At low temperatures, the resistance peak having a strong anisotropy shows large hysteresis which is attributed to Ising quantum Hall ferromagnetism. The peak is split into two peaks in the paramagnetic regime. A mean field calculation for the peak positions indicates that electron scattering is strong when the pseudospin is partially polarized. We also study the current-voltage characteristics which exhibit a wide voltage plateau.