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Yanagisawa, Y.,Suetomi, Y.,Piao, R.,Yamagishi, K.,Takao, T.,Hamada, M.,Saito, K.,Ohki, K.,Yamaguchi, T.,Nagaishi, T.,Kitaguchi, H.,Ueda, H.,Shimoyama, J.,Ishii, Y.,Tomita, M.,Maeda, H. The Korea Institute of Applied Superconductivity a 2018 초전도와 저온공학 Vol.20 No.2
The present article briefly overviews the plan for a new project on joint technology for HTS wires/cables and describes the development plan for the world's highest field NMR magnet, which is a major development item in the project. For full-fledged social implementation of superconducting devices, high temperature superconducting (HTS) wire is a key technology since they can be cooled by liquid nitrogen and they can generate a super-high magnetic field of >>24 T at liquid helium temperatures. However, one of the major drawbacks of the HTS wires is their availability only in short lengths of a single piece of wire. This necessitates a number of joints being installed in superconducting devices, resulting in a difficult manufacturing process and a large joint resistance. In Japan, a large-scale project has commenced, including two technical demonstration items: (i) Development of superconducting joints between HTS wires, which are used in the world's highest field 1.3 GHz (30.5 T) NMR magnet in persistent current mode; the joints performance is evaluated based on NMR spectra for proteins. (ii) Development of ultra-low resistive joints between DC superconducting feeder cables for railway systems. The project starts a new initiative of next generation super-high field NMR development as well as that of realization of better superconducting power cables.
Invariant Mass Spectroscopy for the Neutron Rich Nuclei
사토,추경호,방형찬,S. H. Choi,T. Nakamura,Y. Kondo,Y. Nakayama,N. Kobayashi,K. N. Tanaka,S. Deguchi,Y. Kawada,N. Tanaka,T. Sugimoto,T. Motobayashi,H. Sakurai,H. Otsu,N. Aoi,Y. Yanagisawa,S. Takeuchi,N. Fukuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The neutron-rich carbon isotopes ^(19,17)C and a boron isotope ^(14)B are investigated respectively via proton inelastic and charge-exchange reactions on a liquid hydrogen target at around 70 MeV/nucleon at RIKEN. The invariant mass method in inverse kinematics involving coincidence detection of a charged fragment and a neutron both emitted at forward angles is employed to map the energy spectrum above the neutron decay threshold. Several resonance structures are revealed in the invariant mass spectra, and the nature for some of them is discussed from comparisons of differential cross section data with predictions of microscopic DWBA calculations based on spsdpf shell model wave functions and a recent parametrization of semi-microscopic nucleon-nucleus optical model potential (JLMB). By extrapolating the (p,n) cross sections leading to the 1^+ state at 1.27 MeV in ^(141)B to zero momentum transfer the Gamow-Teller transition strength is deduced. The value is found to compare well with that reported in a β-delayed neutron emission study.
Lightcurve survey of V-type asteroids in the inner asteroid belt
Hasegawa, S.,Miyasaka, S.,Mito, H.,Sarugaku, Y.,Ozawa, T.,Kuroda, D.,Nishihara, S.,Harada, A.,Yoshida, M.,Yanagisawa, K.,Shimizu, Y.,Nagayama, S.,Toda, H.,Okita, K.,Kawai, N.,Mori, M.,Sekiguchi, T.,Is Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3