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Study on α-cluster levels in non-4n nuclei using low-energy RI beams
Yamaguchi, H,Kahl, D,Hayakawa, S,Sakaguchi, Y,Abe, K,Nakao, T,Suhara, T,Iwasa, N,Kim, A,Kim, D H,Cha, S M,Kwag, M S,Lee, J H,Lee, E J,Chae, K Y,Wakabayashi, Y,Imai, N,Kitamura, N,Lee, P,Moon, J Y,Lee, IOP Publishing 2017 Journal of physics. Conference series Vol.863 No.-
Infrared Reflectance in GaN/AlGaN Triangular Stripes Grown on Si(111) Substrates by MOVPE
M. Mizushima,M. Yamaguchi,N. Sawaki,T. Kato,Y. Honda 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
Infrared reflectance spectroscopy was applied to the GaN/AlGaN triangular stripes grown on a Si(111) substrate by selective area metalorganic vapor phase epitaxy. Because of the triangular shape of the GaN, which worked itself as a prism, we could detect the local vibration modes of Si-N, N-H$_2$, Si-H, and Si-O bonds near the GaN/Si interface with high sensitivity.
M. Yamaguchi,Y. Masuda 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Bismuth titanate (Bi4Ti3O12) thin lms were fabricated on (100)-oriented silicon substrates with bismuth silicate (Bi2SiO5) buer layer by alternately supplying metal-organic decomposition (MOD) method. The alternately supplying MOD method was spin coated turn about bismuth and titanium precursor layers. Therefore, the fundamental formation was construction before high temperature crystallized process. It was conrmed that the resultant lms were single-phase Bi4Ti3O12 with c-axis dominant orientation with thin precursor lm. Furthermore, the crystallinity and the surface morphology of the lm was greatly dependence on the order of precursor layers. The metal-insulatorsemiconductor (MIS) structures exhibit relatively superior dielectric characteristics. Then, we think that the Bi4Ti3O12 thin lm properties were improved by using alternately supplying metal-organic decomposition process.멱?
Yamaguchi, Y.,Nakano, M.,Nagao, H.,Okumura, M.,Yamanaka, S.,Kawakami, T.,Yamaki, D.,Nishino, M.,Shigeta, Y.,Kitagawa, Y.,Takano, Y.,Takahata, M.,Takeda, R. Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.6
A unified picture for magnetism, superconductivity, quantum optics and other properties of molecule-based materials has been presented on the basis of effective model Hamiltonians, where necessary parameter values have been determined by the first principle calculations of cluster models and/or band models. These properties of the matetials are qualitatively discussed on the basis of the spin and pseudo-spin Hamiltonian models, where several quantum operators are expressed by spin variables under the two level approximation. As an example, ab initio broken-symmetry DFT calculations are performed for cyclic magnetic ring constructed of 34 hydrogen atoms in order to obtain effective exchange integrals in the spin Hamiltonian model. The natural orbital analysis of the DFT solution was performed to obtain symmetry-adapted molecular orbitals and their occupation numbers. Several chemical indices such as information entropy and unpaired electron density were calculated on the basis of the occupation numbers to elucidate the spin and pair correlations, and bonding characteristic (kinetic correlation) of this mesoscopic magnetic ring. Both classical and quantum effects for spin alignments and singlet spin-pair formations are discussed on the basis of the true spin Hamiltonian model in detail. Quantum effects are also discussed in the case of superconductivity, atom optics and quantum optics based on the pseudo spin Hamiltonian models. The coherent and squeezed states of spins, atoms and quantum field are discussed to obtain a unified picture for correlation, coherence and decoherence in future materials. Implications of theoretical results are examined in relation to recent experiments on molecule-based materials and molecular design of future molecular soft materials in the intersection area between molecular and biomolecular materials.
Experimental investigation of a linear-chain structure in the nucleus <sup>14</sup>C
Yamaguchi, H.,Kahl, D.,Hayakawa, S.,Sakaguchi, Y.,Abe, K.,Nakao, T.,Suhara, T.,Iwasa, N.,Kim, A.,Kim, D.H.,Cha, S.M.,Kwag, M.S.,Lee, J.H.,Lee, E.J.,Chae, K.Y.,Wakabayashi, Y.,Imai, N.,Kitamura, N.,Lee North-Holland Pub. Co 2017 Physics letters. Section B Vol.766 No.-
It is a well-known fact that a cluster of nucleons can be formed in the interior of an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of α-cluster states in the radioactive <SUP>14</SUP>C nucleus. Using the Be10+α resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus.
Trigonal Silver Nanostructure for Single Molecule Detection with Surface Enhanced Raman Scattering
Y. Yamaguchi,M. Futamata,M. Ishikawa,Y. Maruyama 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
Silver nanostructure was fabricated by means of nanosphere lithography developed by Van Duyne et al. The nanostructure is composed of a two-dimensional (2-D) array of trigonal prisms that could form an enormous electric field at their sharp edges under localized surface plasmon resonances to provide single molecule sensitivity. In fact, it yielded the blinking of a SERS signal from adsorbed rhodamine 6G, which is an abrupt and repeated intensity fluctuation with time and has been attributed to a single molecule phenomenon. The blinking occurred on the trigonal metal nanostructure approximately 20 times as efficiently as on continuous silver films prepared with the same evaporation condition as for the trigonal structure. Accordingly, the trigonal silver nanostructure is quite promising to give single molecule sensitivity in SERS.