s-Shell Λ-Hypernuclei Taking into Account Λ N–ΣN Coupling Explicitly with TOSM

The Λ N–ΣN coupling is one of the open questions in strangeness physics. We studied the Λ N–ΣN coupling explicitly in light s-shell hypernuclei using Tensor Optimized Shell Model, which is ab initio like approach starting from the realistic interaction. We show the obtained results of s-shell Λ-hypernuclei, _Λ ⁴ H and _Λ ⁵ He, and investigate the roles of the Λ N–ΣN coupling interaction in those hypernuclei.     

Tensor-Optimized Shell Model for s-Shell Hypernuclei

The explicit ΛN ? ΣN coupling in s-shell hypernuclei is studied by using the tensor-optimized shell model. We show the obtained results of s-shell hypernuclei, ${_{\Lambda}^{4}{\rm H}}$ and ${_{\Lambda}^{5}{\rm He}}$ , and investigate the roles of the ΛN ? ΣN coupling interaction in those hypernuclei.     

Signature of Strange Dibaryon in Kaon-Induced Reaction

We examine how the signature of the strange-dibaryon resonances in the ${\bar{K}NN}$ –πΣ N system shows up in the scattering amplitude on the physical real energy axis within the framework of Alt–Grassberger–Sandhas equations. The so-called point method is applied to handle the three-body unitarity cut in the amplitudes. We also discuss the possibility that the strange-dibaryon production reactions can be used for discriminating between existing models of the two-body ${\bar{K}N}$ –πΣ system with Λ(1405).     

Tensor-Optimized Few-Body Model for s-Shell Nuclei

We propose a tensor-optimized few-body model (TOFM) in the few-body framework with bare nucleon–nucleon interaction. The physical concept of TOFM comes from the tensor-optimized shell-model (TOSM), which is applicable for the study of medium and heavy nuclei. The TOSM wave function describes the deuteron-like tensor correlation and provides a good reproduction of the binding energy with the bare nucleon–nucleon interaction. Using the spirit of the TOSM approximation, we show the performance of TOFM for s-shell nuclei. It is found that the TOFM can account for the contribution of the tensor interaction very well and almost reproduces the total energy and various energy components as compared with rigorous few-body calculations. The relative correlation function is also provided to improve the performance of TOSM for the study of heavy nuclei.     

Improved Threshold Constraints on Coupled-Channels Chiral SU(3) Dynamics from Kaonic Hydrogen

${\bar{K}}$ -nucleon interactions near threshold are investigated in the framework of coupled-channels dynamics based on the next-to-leading order chiral SU(3) meson-baryon effective Lagrangian. Accurate constraints are now provided by new high-precision kaonic hydrogen measurements. This constraint permits an updated analysis of the complex ${\bar{K}N}$ and πΣ coupled-channels amplitudes.     

Ultrathin gate dielectrics for silicon nanodevices

This paper reviews recent progress in structural and electronic characterizations of ultrathin SiO₂thermally grown on Si(100) surfaces and applications of such nanometer-thick gate oxides to advanced MOSFETs and quantum-dot MOS memory devices. Based on an accurate energy band profile determined for the n ⁺ -poly- Si/SiO₂/Si(100) system, the measured tunnel current through ultrathin gate oxides has been quantitatively explained by theory. From the detailed analysis of MOSFET characteristics, the scaling limit of gate oxide thickness is found to be 0.8 nm. Novel MOSFETs with a silicon quantum-dot floating gate embedded in the gate oxide have indicated the multiple-step electron injection to the dot, being interpreted in terms of Coulombic interaction among charged dots.     

Photodynamic Activity of Fullerene Derivatives Solubilized in Water by Natural-Product-Based Solubilizing Agents

Water-soluble fullerenes prepared by using solubilizing agents based on natural products are promising photosensitizers for photodynamic therapy. Cyclodextrin, β-1,3-glucan, lysozyme, and liposomes can stably solubilize not only C₆₀ and C₇₀, but also some C₆₀ derivatives in water. To improve the solubilities of fullerenes, specific methods have been developed for each solubilizing agent. Water-soluble C₆₀ and C₇₀ exhibit photoinduced cytotoxicity under near-ultraviolet irradiation, but not at wavelengths over 600 nm, which are the appropriate wavelengths for photodynamic therapy. However, dyad complexes of solubilized C₆₀ derivatives combined with light-harvesting antenna molecules improve the photoinduced cytotoxicities at wavelengths over 600 nm. Furthermore, controlling the fullerene and antenna molecule positions within the solubilizing agents affects the performance of the photosensitizer.     

Identification of degranulation inhibitors from rooibos (Aspalathus linearis) tea in rat basophilic leukaemia cells

Quercetin, luteolin and chrysoeriol were identified from rooibos tea as degranulation inhibitors in rat basophilic leukaemia cells. The degranulation inhibitory activity of chrysoeriol was first discovered in the present study. When quercetin, luteolin and chrysoeriol were mixed in the ratio that occurs in rooibos tea extract, the mixture inhibited antigen- and calcium ionophore-stimulated degranulation to the same degree as that by the whole rooibos tea extract. These findings indicate that these three flavonoids are the key factors underlying the degranulation inhibitory activity of rooibos tea.     

Mechanistic study of silica-gel or FeCl3-promoted ring-opening aromatization of 7-oxanorborna-2,5-dienes affording 2-bromo-3-hydroxybenzoate derivatives

Research on Chemical Intermediates - One-pot synthesis of 2-bromo-3-hydroxybenzoates by the Diels–Alder reaction of furans with bromoalkyne and the subsequent ring-opening aromatization was...