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U target nucleusNishio, Katsuhisa
Journal of Physics; Conference Series, 312, p.082007_1 - 082007_10, 2011/09
Times Cited Count：1 Percentile：47.57(Physics, Nuclear)Maruyama, Toshiki; Tatsumi, Toshitaka*
Journal of Physics; Conference Series, 312, p.042015_1 - 042015_6, 2011/09
Times Cited Count：2 Percentile：69.89(Astronomy & Astrophysics)Liquid-gas (LG) phase transition and the relevant equation of state (EOS) is one of the most important subjects in nuclear physics and astrophysics. In the crust region of compact stars or supernovae we can expect non-uniform matter with exotic shapes called pasta as a mixed phase during the liquid-gas phase transition. It is not only interesting theoretically but may affect the mechanical and thermodynamical properties of compact stars. We explore the geometrical structure of LG mixed phase by using relativistic mean-field model. To get the EOS of the system, the Maxwell construction is found to be applicable to symmetric nuclear matter, where protons and neutrons behave simultaneously. For asymmetric nuclear matter, on the other hand, the phase equilibrium is obtained by fully solving the Gibbs conditions since the components in the L and G phases are completely different. We also discuss the effects of surface and the Coulomb interaction on the mixed phase.
Muto, Takumi*; Maruyama, Toshiki; Tatsumi, Toshitaka*
Journal of Physics; Conference Series, 312, p.022018_1 - 022018_6, 2011/09
Times Cited Count：0 Percentile：0.05(Physics, Nuclear)The effects of the 
(
) and range terms (the second-order effects, SOE) on the structure of multi-antikaonic nuclei are studied in a relativistic mean-field theory coupled with the nonlinear effective chiral Lagrangian. It is shown that, due to the attractive interaction from the -pole contribution, the 
mesons and the protons are more attracted each other than the case without the SOE. On the other hand, the density distribution for neutron is pushed outward due to the repulsive effect from the range terms. The SOE is also discussed in connection with modification of kaon properties in a dense medium.
Yasutake, Nobutoshi*; Maruyama, Toshiki; Tatsumi, Toshitaka*
Journal of Physics; Conference Series, 312, p.042027_1 - 042027_6, 2011/09
Times Cited Count：9 Percentile：93.4(Astronomy & Astrophysics)We study the quark-hadron mixed phase in protoneutron stars with the finite-size effects. In the calculations of pasta structures appeared in the mixed phase, the Gibbs conditions require the pressure balance and chemical equilibrium between two phases besides the thermal equilibrium. We find that the region of the mixed phase is limited due to thermal instability. Moreover, we study the effects of neutrinos to the pasta structures. As a result, we find that the existence of neutrinos make the pasta structures unstable, too. These characteristic features of the hadron-quark mixed phase should be important for the middle stage of the evolutions of protoneutron stars.
Ogata, Kazuyuki*; Matsumoto, Takuma*; Hashimoto, Shintaro; Minomo, Kosho*; Egami, Tomoaki*; Iseri, Yasunori*; Kono, Michio*; Chiba, Satoshi; Bertulani, C. A.*; Shimizu, Yoshifumi*; et al.
Journal of Physics; Conference Series, 312, p.082008_1 - 082008_10, 2011/09
Times Cited Count：1 Percentile：47.57(Physics, Nuclear)Recent studies on breakup reactions with the continuum-discretized coupled channels method are reviewed. The topics covered are: four-body breakup processes for 
He induced reaction, dynamical relativistic effects on coulomb breakup, microscopic description of projectile breakup processes, description of ternary processes (new triple-
reaction rate) and new approach to inclusive breakup processes.
Shizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Tamii, Atsushi*; Homma, Michio*; Nakada, Hitoshi*
no journal, ,
Low-lying electromagnetic transitions can be studied by the method of nuclear resonance fluorescence (NRF). Recently, it has been shown that quasi-monochromatic, linearly polarized photon beams from inverse laser Compton scattering has considerably increased experimental sensitivity and to enable one to detect the fine structure of relatively weak M1 transitions. In this report, results of the NRF measurements on nuclei around lead and iron region will be presented. The M1 resonance below the neutron separation energy is resolved in to individual transitions. The experimental results are compared with theoretical predictions based on self-consistent RPA and Shell model calculations. The role of the tensor interaction in giant M1 resonance region is discussed.
