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Furumoto T.,Ichinoseki National College of Technology | Sakuragi Y.,Osaka City University | Yamamoto Y.,RIKEN
Physical Review C - Nuclear Physics | Year: 2014

We investigate the sensitivity of the medium effect in the high-density region on nucleus-nucleus elastic scattering in the framework of the double-folding (DF) model with the complex G-matrix interaction. The medium effect including the three-body-force (TBF) effect is investigated with two methods. In both methods, the medium effect is clearly seen on the potential and the elastic cross section. Finally, we make clear the crucial role of the TBF effect up to kF=1.6 fm-1 in nucleus-nucleus elastic scattering. © 2014 American Physical Society. Source


Yamamoto Y.,Accelerator Centre | Furumoto T.,Ichinoseki National College of Technology | Yasutake N.,Chiba Institute of Technology | Rijken Th.A.,Accelerator Centre | Rijken Th.A.,Radboud University Nijmegen
Physical Review C - Nuclear Physics | Year: 2014

A multi-Pomeron exchange potential (MPP) is proposed as a model for the universal many-body repulsion in baryonic systems on the basis of the extended soft core (ESC) baryon-baryon interaction. The strength of the MPP is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The interaction in ΛN channels is shown to reproduce well the experimental Λ binding energies. The equation of state (EoS) in neutron matter with hyperon mixing is obtained including the MPP contribution, and mass-radius relations of neutron stars are derived. It is shown that the maximum mass can be larger than the observed one, 2M, even in the case of including hyperon mixing on the basis of model parameters determined by terrestrial experiments. © 2014 American Physical Society. Source


Osada M.,Ichinoseki National College of Technology | Yamaguchi A.,Japan National Institute of Advanced Industrial Science and Technology | Hiyoshi N.,Japan National Institute of Advanced Industrial Science and Technology | Sato O.,Japan National Institute of Advanced Industrial Science and Technology | Shirai M.,Japan National Institute of Advanced Industrial Science and Technology
Energy and Fuels | Year: 2012

Gasification of sugarcane bagasse on activated-carbon- and titania-supported ruthenium (Ru/C and Ru/TiO 2) catalysts in supercritical water was studied. Sugarcane bagasse was completely gasified to methane, carbon dioxide, and hydrogen over Ru/C and Ru/TiO 2 catalysts at 673 K. The carbon yield of the gas products from sugarcane bagasse, cellulose, and lignin over the Ru/TiO 2 catalyst at a water density of 0.33 g cm -3 for 15 min was 50.3, 74.4, and 31.1 C %, respectively. In addition, it was observed that an increase in the water density enhanced the initial carbon yield of the gas products for 15 min. The recyclability of the Ru/C catalyst with complete gasification could make it a sustainable process. © 2012 American Chemical Society. Source


Yamamoto Y.,Accelerator Centre | Furumoto T.,Ichinoseki National College of Technology | Yasutake N.,Chiba Institute of Technology | Rijken T.A.,Accelerator Centre | Rijken T.A.,Radboud University Nijmegen
Physical Review C - Nuclear Physics | Year: 2013

A multi-Pomeron exchange potential (MPP) is proposed as a model for the three-body repulsion indicated in neutron-star matter, which works universally among three and four baryons. Its strength is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The equation of state in neutron matter is obtained including the MPP contribution. The neutron-star mass is calculated by solving the Tolmann-Oppenheimer-Volkof equation. The maximum mass is obtained to be larger than the observed one, 1.97Msolar, on the basis of the experimental data. © 2013 American Physical Society. Source


Hirano K.,Ichinoseki National College of Technology | Komiya Z.,Tokyo University of Science
International Journal of Modern Physics D | Year: 2011

We study the observational constraints on the Phantom Crossing DGP model. We demonstrate that the crossing of the phantom divide does not occur within the framework of the original Dvali-Gabadadze-Porrati (DGP) model or the DGP model developed by Dvali and Turner. By extending their model in the framework of an extra dimension scenario, we study a model that realizes crossing of the phantom divide. We investigate the cosmological constraints obtained from the recent observational data of Type Ia supernovae, cosmic microwave background anisotropies, and baryon acoustic oscillations. The best-fit values of the parameters with 1σ (68%) errors for the Phantom Crossing DGP model are Ωm, 0 = 0.27+0.02 -0.02, β = 0.54+0.24 -0.30. We find that the Phantom Crossing DGP model is more compatible with the observations than the original DGP model or the DGP model developed by Dvali and Turner. Our model can realize late-time acceleration of the universe, similar to that of ΛCDM model, without dark energy due to the effect of DGP gravity. In our model, the crossing of the phantom divide occurs at a redshift of z ∼ 0.2. © 2011 World Scientific Publishing Company. Source

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