We report on a method of assigning the mode indices to whispering-gallery modes observed in the fluorescence spectra of Er3+doped tellurite glass microspheres.

We propose and demonstrate a "bottom-up" approach to constructing photonic structures for photon manipulation. Supermonodispersive polymer microspheres are used as building blocks and a size uniformity better than 0.05% could be obtained by sorting the spheres using spectroscopic methods. The spheres are positioned in a V groove on a silicon substrate and form a photonic chain with resonant coupling of the optical whispering-gallery modes. Photonic band modes are clearly observed in fluorescence and resonant scattering spectra, and an excellent agreement with a tight-binding model calculation is found. Heavy photon states and a group index as high as 40 are obtained.

Mode profile and lasing characteristics of resonantly coupled whispering gallery modes of size-matched dye doped polymer spheres placed on semiconductor V-groove are examined. Photonic molecule like behavior is clearly observed.

Lasing at resonantly coupled whispering-gallery mode frequencies is observed in photonic molecules consisting of bispheres of 4.2 and 5.1 microm in diameter placed in a silicon V-groove. We examine spatial profiles of photonic molecule modes by use of frequency-resolved imaging and reveal bonding and antibonding mode features. From the lasing threshold characteristics, we quantitatively measure the quality factor and the spontaneous-emission coupling ratio of the photonic molecule modes and confirm that strong coherent coupling leads to photonic molecule modes.

We show that the deformed Virasoro algebra specializes in a certain limit to Lepowsky-Wilson's Z-algebra. This leads to a free field realization of the affine Lie algebra \hat{sl_2} which respects the principal gradation. We discuss some features of this bosonization including the screening current and vertex operators.

Integral formulae for the correlation functions of the XYZ model with a boundary are calculated by mapping the model to the bosonized boundary SOS model. The boundary K-matrix considered here coincides with the known general solution of the boundary Yang–Baxter equation. For the case of a diagonal K-matrix, our formulae reproduce the one-point function previously obtained by solving the boundary version of the quantum Knizhnik–Zamolodchikov equation.

We construct a free field realization of vertex operators of the dilute A_L models along with the Felder complex. For L=3, we also study an E_8 structure in terms of the deformed Virasoro currents.

The charge-exchange reactions (12C,12N) at EA = 135 MeV and (13C,13N) at EA = 100 MeV have been studied for several nuclei. These two reactions have different selectivity for the spin transfer. The differential cross sections for the 12C(12C,12N)12B charge-exchange reaction leading to the 12B (1+) ground state, Ex = 4.5 MeV and Ex = 7.5 MeV states were well described by the microscopic DWBA calculations suggesting the dominance of the one-step process.

The new intermediate energy Deuteron POLarimeter DPOL at RIKEN is described. DPOL is designed to measure all the vector and tensor polarization components simultaneously by utilizing the three reactions: 12C(d,d0), 1H(d,2He) and d+p. Preliminary results of the first test experiment with a polarized deuteron beam at 270 MeV are also presented.

The tensor analyzing power of the (d,2He) reaction has been measured at 270 MeV. Its usefulness for the spectroscopic study, particularly in identifying Jπ of the spin‐flip dipole states, is demonstrated for a 12C target. The data are reasonably reproduced in terms of the DWBA theory for the three‐body reaction.

The tensor analyzing power of the (d, 2He) reaction has been measured at 270 MeV. Its usefulness for spectroscopic studies, particularly in identifying the Jπ of spin-flip dipole states, is demonstrated for a 12C target. The data are reasonably well reproduced in terms of the distorted-wave Born approximation theory for the three-body reaction.

It is theoretically shown that the tensor analyzing powers of the (→d, 2He) reaction contain essentially the same nuclear infrrmation as (→N, →N polarization transfer observables [1]. Considering its unique selectivities, ΔS =1, ΔT = 1 and ΔTZ = +1, the (→d, 2He) reaction should be a useful tool for the study of spin-dipole state, particularly in identifying Jπ (2−, 1− and 0−). To confirm this point experimentally, Axx, Ayy and Ay of the 12C(→d, 2He) 12B reaction have been measured at Ed = 270 MeV utilizing the newly constructed polarized ion source at RIKEN.

The (d,2He) reactions on 24Mg, 26Mg and 28Si were studied at Ed = 270 MeV. The 0o cross sections obtained for the 1+ states from the 24Mg,28Si(d,2He) reactions show a good correlation with those from the mirror (p,n) reactions. Four peaks were identified in the 26Mg(d,2He)26Ne reactions as being due to the 1+ excitation. The B(GT+) values for these transitions were estimated and compared with the shell model prediction.