Non-Uniform Structure of Matter and the Equation of State (2007)
Maruyama, Toshiki, Chiba, Satoshi, Tatsumi, Toshitaka
We investigate the non-uniform structures and the equation of state (EOS) of nuclear matter in the context of the first-order phase transitions (FOPT) such as liquid-gas phase transition, kaon...
Hyperon-Quark Mixed Phase in Dense Matter (2007)
Maruyama, Toshiki, Chiba, Satoshi, Schulze, Hans-Josef, Tatsumi, Toshitaka
We investigate the properties of the hadron-quark mixed phase in compact stars using a Brueckner-Hartree-Fock framework for hadronic matter and the MIT bag model for quark matter. We find that the...
Hyperon-Quark Mixed Phase in Compact Stars (2007)
Maruyama, Toshiki, Chiba, Satoshi, Schulze, Hans-Josef, Tatsumi, Toshitaka
We investigate the properties of the hadron-quark mixed phase in compact stars using a Brueckner-Hartree-Fock framework for hadronic matter and the MIT bag model for quark matter. We find that the...
Hadron-quark mixed phase in hyperon stars (2007)
Maruyama, Toshiki, Chiba, Satoshi, Schulze, Hans-Josef, Tatsumi, Toshitaka
We analyze the different possibilities for the hadron-quark phase transition occurring in beta-stable matter including hyperons in neutron stars. We use a Brueckner-Hartree-Fock approach including...
Quark deconfinement transition in hyperonic matter (2007)
Maruyama, Toshiki, Chiba, Satoshi, Schulze, Hans-Josef, Tatsumi, Toshitaka
We discuss the properties of the hadron-quark mixed phase in compact stars using a realistic equation of state of hyperonic matter and the MIT bag model. We find that the equation of state of the...
Pasta structures in compact stars (2006)
Maruyama, Toshiki, Tatsumi, Toshitaka, Endo, Tomoki, Chiba, Satoshi
We review our recent works about ``pasta'' structures following the first-order phase transition in dense matter, which correspond to the structured mixed phases with geometrical symmetries. Three...
Charge screening effect on hadron-quark mixed phase in compact stars (2006)
Endo, Tomoki, Maruyama, Toshiki, Chiba, Satoshi, Tatsumi, Toshitaka
We study the charge screening effect in the hadron-quark mixed phase. By including the charge screening effect, rearrangement of charged particles occurs and some part becomes locally charge-neutral....
Finite-size effects on the hadron-quark mixed phase (2006)
Endo, Tomoki, Maruyama, Toshiki, Chiba, Satoshi, Tatsumi, Toshitaka
We show that the hadron-quark mixed phase is restricted to narrow range of baryon chemical potential by the charge screening effect. Accordingly the mixed phase expected in hadron-quark hybrid stars...
Charge screening effect in the hadron-quark mixed phase (2005)
Endo, Tomoki, Maruyama, Toshiki, Chiba, Satoshi, Tatsumi, Toshitaka
The Coulomb interaction effect and the surface effect are consistently taken into account in the hadron-quark mixed phase. These two finite-size effects greatly change the properties of the mixed...
Finite size effects on kaonic pasta structures (2005)
Maruyama, Toshiki, Tatsumi, Toshitaka, Voskresensky, Dmitri N., Tanigawa, Tomonori, Endo, Tomoki, Chiba, Satoshi
Non-uniform structures of mixed phases at the first-order phase transition to charged kaon condensation are studied using a density functional theory within the relativistic mean field model....
Akimura, Yuka, Maruyama, Toshiki, Yoshinaga, Naotaka, Chiba, Satoshi
We study the baryon-quark phase transition in a molecular dynamics (MD) of quark degrees of freedom at finite temperature and density. The baryon state at low density and temperature, and the...
Nuclear pasta structures and the charge screening effect (2005)
Maruyama, Toshiki, Tatsumi, Toshitaka, Voskresensky, Dmitri . N., Tanigawa, Tomonori, Chiba, Satoshi
Non uniform structures of the nucleon matter at subnuclear densities are numerically studied by means of the density functional theory with relativistic mean-fields coupled with the electric field. A...
Hadron-quark matter phase transition in neutron stars (2005)
Endo, Tomoki, Maruyama, Toshiki, Chiba, Satoshi, Tatsumi, Toshitaka
A structured mixed phase consisting of quark and hadron phases is numerically studied with the Coulomb screening effect and the surface effect. We carefully introduced the Coulomb potential, so that...
Nuclear pasta structures in neutron stars and the charge screening (2005)
Tatsumi, Toshitaka, Maruyama, Toshiki, Voskresensky, Dmitri N., Tanigawa, Tomonori, Chiba, Satoshi
Non-uniform structures of the nucleon matter are expected at subnuclear densities and above the nuclear density: they are called nuclear pastas and kaon pastas, respectively. We numerically study...
Stability and structure of quark matter in a molecular dynamics framework (2004)
Akimura, Yuka, Maruyama, Toshiki, Yoshinaga, Naotaka, Chiba, Satoshi
We study stability and structure of quark matters as a function of density in a framework of molecular dynamics (MD). Using appropriate effective interactions and the frictional cooling method, we...
Numerical study of the hadron-quark mixed phase (2004)
Endo, Tomoki, Maruyama, Toshiki, Chiba, Satoshi, Tatsumi, Toshitaka
The Coulomb screening effect and the finite-size effect such as surface tension are figured out in the hadron-quark deconfinement phase transition. We study the mixed phase of the quark droplets...
Simulation of Transitions between "Pasta" Phases in Dense Matter (2004)
Watanabe, Gentaro, Maruyama, Toshiki, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Calculations of equilibrium properties of dense matter predict that at subnuclear densities nuclei can be rodlike or slablike. To investigate whether transitions between phases with non-spherical...
Wandering in Color-Space -- why the life of pentaquark is so long ? -- (2004)
Maezawa, Yuu, Maruyama, Toshiki, Itagaki, Naoyuki, Hatsuda, Tetsuo
The problem of the long life time of the pentaquark $\Theta^+$ is investigated on the basis of the color molecular dynamics simulation. We find that it takes a long time (typically of 50-100 fm/c)...
Coulomb screening effect on the nuclear-pasta structure (2004)
Maruyama, Toshiki, Tatsumi, Toshitaka, Voskresensky, Dmitri N., Tanigawa, Tomonori, Chiba, Satoshi, Maruyama, Tomoyuki
Using the density functional theory (DFT) with the relativistic mean field (RMF) model, we study the non-uniform state of nuclear matter, ``nuclear pasta''. We self-consistently include the Coulomb...
Kaon Condensation and the Non-Uniform Nuclear Matter (2003)
Maruyama, Toshiki, Tatsumi, Toshitaka, Voskresensky, Dmitri N., Tanigawa, Tomonori, Chiba, Satoshi
Non-uniform structures of nuclear matter are studied in a wide density-range. Using the density functional theory with a relativistic mean-field model, we examine non-uniform structures at...
Sideward Peak of Intermediate Mass Fragments in High Energy Proton Induced Reactions (2001)
Hirata, Yuichi, Ohnishi, A., Nara, Y., Kido, T., Maruyama, Toshiki, Otuka, N., ...
Intermediate mass fragment (IMF) formation in the 12 GeV proton induced reaction on Au target is analyzed by using a combined framework of a transport model (JAM/MF) and a newly developed...
Vlasov calculations of nuclear ground states (2001)
Bonasera, Aldo, Maruyama, Toshiki, Papa, Massimo, Chiba, Satoshi
We describe some properties of nuclear ground states using a microscopic Vlasov approach. We propose a new method to find the energy minimum of the system enforcing the fermionic nature of the...
Formation and decay of super heavy systems (2001)
Maruyama, Toshiki, Bonasera, Aldo, Papa, Massimo, Chiba, Satoshi
We investigate the formation and the decay of heavy systems which are above the fission barrier. By using a microscopic simulation of constraint molecular dynamics (CoMD) on Au+Au collision, we...
Nuclear fragmentation by tunneling (2001)
Maruyama, Toshiki, Bonasera, Aldo, Chiba, Satoshi
Fragmentation of nuclear system by tunneling is discussed in a molecular dynamics simulation coupled with imaginary time method. In this way we obtain informations on the fragmenting systems at low...
Color Molecular Dynamics Simulation of Nuclei and Dense Matter (2000)
Toshiki Maruyama, Tetsuo Hatsuda
this paper, we perform a molecular dynamics (MD) simulation of a system composed of many constituent quarks with SU(3) color degrees of freedom[6]. Although there exist several works on the quark...
Color Molecular-Dynamics for High Density Matter (1999)
Maruyama, Toshiki, Hatsuda, Tetsuo
We propose a microscopic simulation for quark many-body system based on molecular dynamics. Using color confinement and one-gluon exchange potentials together with the meson exchange potentials...
Quantum Molecular Dynamics Approach to the Nuclear Matter Below the Saturation Density (1997)
Maruyama, Toshiki, Niita, Koji, Oyamatsu, Kazuhiro, Maruyama, Tomoyuki, Chiba, Satoshi, Iwamoto, Akira
Quantum molecular dynamics is applied to study the ground state properties of nuclear matter at subsaturation densities. Clustering effects are observed as to soften the equation of state at these...
Maruyama, Tomoyuki, Niita, Koji, Chiba, Satoshi, Maruyama, Toshiki, Iwamoto, Akira
We study the photoreaction in the delta energy region using the QMD approach. The proton and pion cross-sections are calculated and compared with experimental data. Through this work we examine the...
Chiba, Satoshi, Iwamoto, Osamu, Fukahori, Tokio, Niita, Koji, Maruyama, Toshiki, Maruyama, Tomoyuki, ...
The production cross sections of various fragments from proton-induced reactions on $^{56}$Fe and $^{27}$Al have been analyzed by the Quantum Molecular Dynamics (QMD) plus Statistical Decay Model...
On the IMF Multiplicity in Au+Au Reactions (1996)
Iwamoto, Akira, Niita, Koji, Maruyama, Toshiki, Maruyama, Tomoyuki
Intermediate mass fragment (IMF) multiplicity has been investigated for Au+Au reactions at incident energies of 100, 250 and 400 MeV/A. From the analysis of the impact-parameter-dependence of the IMF...
Relativistic Effects in the Transverse Flow in the Molecular Dynamics Framework (1996)
Maruyama, Tomoyuki, Niita, Koji, Maruyama, Toshiki, Chiba, Satoshi, Nakahara, Yasuaki, Iwamoto, Akira
In order to investigate relativistic effects we compare the transverse flow calculated by using the four versions of the QMD approaches with that of the full covariant RQMD approach. From the...
Chiba, Satoshi, Chadwick, Mark B., Niita, Koji, Maruyama, Toshiki, Maruyama, Tomoyuki, Iwamoto, Akira
The preequilibrium (nucleon-in, nucleon-out) angular distributions of $^{27}$Al, $^{58}$Ni and $^{90}$Zr have been analyzed in the energy region from 90 to 200 MeV in terms of the Quantum Moleculear...
Extension of Quantum Molecular Dynamics and its Application to Heavy-Ion Collisions (1995)
Maruyama, Toshiki, Niita, Koji, Iwamoto, Akira
In order to treat low-energy heavy-ion reactions, we make an extension of quantum molecular dynamics method. A phenomenological Pauli potential is introduced into effective interactions to...
Analysis of the (N,xN') reactions by quantum molecular dynamics plus statistical decay model (1995)
Niita, Koji, Chiba, Satoshi, Maruyama, Toshiki, Maruyama, Tomoyuki, Takada, Hiroshi, Fukahori, Tokio, ...
We propose a model based on quantum molecular dynamics (QMD) incorporated with statistical decay model (SDM) to describe various nuclear reactions in an unified way. In this first part of the work,...
Maruyama, Tomoyuki, Maruyama, Toshiki, Niita, Koji
We simulate the fragmentation processes in the \CaCa collisions at the bombarding energy 1.05 GeV/u using the Lorentz covariant RQMD and the non-covariant QMD approaches, incorporated with the...
Nucleon Flow and Fragment Flow in Heavy Ion Reactions (1993)
Ono, Akira, Horiuchi, Hisashi, Maruyama, Toshiki
The collective flow of nucleons and that of fragments in the 12C + 12C reaction below 150 MeV/nucleon are calculated with the antisymmetrized version of molecular dynamics combined with the...
Cui, Longzhu, Iwamoto, Akira, Lian, Jian-Qi, Neoh, Hui-min, Maruyama, Toshiki, Horikawa, Yataro, ...
As an aggressive pathogen, Staphylococcus aureus poses a significant public health threat and is becoming increasingly resistant to currently available antibiotics, including vancomycin, the drug of...
Cui, Longzhu, Iwamoto, Akira, Lian, Jian-Qi, Neoh, Hui-min, Maruyama, Toshiki, Horikawa, Yataro, ...
As an aggressive pathogen, Staphylococcus aureus poses a significant public health threat and is becoming increasingly resistant to currently available antibiotics, including vancomycin, the drug of...