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Fujii, Daisuke; Nakayama, Katsumasa*; Suzuki, Kei
International Journal of Modern Physics A, 40(10-11), p.2543022_1 - 2543022_9, 2025/04
Times Cited Count：0 Percentile：0.00(Physics, Nuclear)In this talk, we discuss the discovery of a new Casimir effect that emerges from the quark field in dense, thin quark matter when the magnetic field is zero or non-zero. Surprisingly, in the dual chiral density wave (DCDW) phase, a candidate ground state of dense quark matter, the Casimir energy oscillates as a function of thickness. This finding highlights a novel oscillating Casimir phenomenon driven by QCD dynamics in extreme conditions.
Fujii, Daisuke; Nakayama, Katsumasa*; Suzuki, Kei
International Journal of Modern Physics A, 40(10-11), p.2543020_1 - 2543020_8, 2025/04
Times Cited Count：0 Percentile：0.00(Physics, Nuclear)In this talk, I discuss the general features of the Casimir effect induced from quantum fields at finite chemical potential, particularly at finite density. Historically, the thermal Casimir effect has been well-established by the cooperation between theory and experiment, whereas its counterpart at finite chemical potential is still not. This is because it is usually difficult to control the chemical potential of photons in equilibrium experimentally. On the other hand, if one focuses on fermionic systems, their chemical potentials may be a tunable parameter for the Casimir effect. In addition, various quantum many-body phenomena realized at finite fermion density can modify the typical property of the Casimir effect. Within some theoretical frameworks, we evaluate the Casimir energy for Dirac fields at finite density and particularly show an oscillatory behavior as a function of the separation of boundary conditions or the chemical potential. As physical and realistic examples of the Casimir effect at finite chemical potential, I discuss applications to fermion fields inside thin dense quark matter in hadron physics and to Dirac/Weyl semimetal thin films in solid-state physics. Such materials will be platforms to examine the fermionic Casimir effect at finite chemical potential.
Fujii, Daisuke; Nakayama, Katsumasa*; Suzuki, Kei
International Journal of Modern Physics A, 40(10-11), p.2543017_1 - 2543017_8, 2025/01
Times Cited Count：0 Percentile：0.00(Physics, Nuclear)We investigate the characteristics of Casimir energy within a lattice-regularized spacetime framework. Typically, Casimir energy requires a regularization procedure to remove divergences originating from vacuum fluctuations of quantum fields. In this work, we adopt lattice regularization, wherein discretization effects persist as long as the lattice spacing remains finite. We first detail how the Casimir energy is computed using both naive and Wilson fermion formulations. When discretization artifacts are limited to only a few lattice points, it becomes possible to recover the continuum Casimir energy by taking the continuum limit. To illustrate physical applications, we evaluate the Casimir energy for electron fields in Dirac/Weyl semimetals, where lattice effects are meaningfully retained, and for photon fields in axion electrodynamics, where the continuum limit is accurately reproduced.
Miao, Z.-Q.*; Xia, C.-J.*; Lai, X.-Y.*; Maruyama, Toshiki; Xu, R.-X.*; Zhou, E.-P.*
International Journal of Modern Physics E, 31(4), p.2250037_1 - 2250037_20, 2022/04
Times Cited Count：17 Percentile：87.96(Physics, Nuclear)Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*
International Journal of Modern Physics; Conference Series (Internet), 49, p.1960002_1 - 1960002_6, 2019/07
Times Cited Count：0 Percentile：0.00(Astronomy & Astrophysics)The hadronic Paschen-Back effects in P-wave charmonia are analyzed using the constituent quark models in strong magnetic field.
Oka, Makoto; Maeda, Saori*; Liu, Y.-R.*
International Journal of Modern Physics; Conference Series (Internet), 49, p.1960004_1 - 1960004_8, 2019/07
Times Cited Count：8 Percentile：94.93(Astronomy & Astrophysics)The charmed dibaryon resonances are given by a model Hamiltonian with the quark-model based short-range interaction and the long-range meson-exchange interactions. Sharp resonances states below the 
-
and 
- thresholds are predicted.
Yoshiasa, Akira*; Murai, Keiichiro*; Arima, Hiroshi*; Katayama, Yoshinori
International Journal of Modern Physics B, 25(31), p.4159 - 4162, 2011/12
Times Cited Count：0 Percentile：0.00(Physics, Applied)Precise structure analyses of advanced materials under pressure were performed using each advantage of X-ray absorption fine structure (XAFS) and diffraction methods. Measurements were performed in-situ under pressure and temperature using a large-volume multi-anvil pressure apparatus and synchrotron radiation. XAFS spectra are useful for phase study under high temperature and high pressure. The XAFS Debye-Waller factor provides anharmonic effective pair potential with a pressure-dependent and temperature-independent shape. The phonon energies and anharmonicity are affected largely by the change in local structure and bonding character.
Wrzosek-Lipska, K.*; Zieli
ska, M.*; Hadyska-Kl
k, K.*; Hatsukawa, Yuichi; Iwanicki, J.*; Katakura, Junichi; Kisieliski, M.*; Koizumi, Mitsuo; Kowalczyk, M.*; Kusakari, Hideshige*; et al.
International Journal of Modern Physics E, 20(2), p.443 - 450, 2011/02
Times Cited Count：8 Percentile：47.52(Physics, Nuclear)The quadrupole shape evolution in heaviest stable Mo isotopes is studied in terms of the shape coexistence phenomenon occurrence in this region of nuclear chart. Quadrupole deformation parameters of the 
Mo isotopes in the low-lying (ground and excited) 0
states were deduced using Coulomb excitation method. In all cases rich sets of electromagnetic reduced matrix elements were determined using the GOSIA code and then analyzed using the Quadrupole Sum Rules formalism. Discussion of the experimental results in comparison with the predictions of microscopic calculations within the general quadrupole collective Bohr Hamiltonian model is presented for 
Mo.
Mitsuoka, Shinichi; Ikezoe, Hiroshi; Nishio, Katsuhisa; Watanabe, Yutaka*; Jeong, S. C.*; Ishiyama, Hironobu*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari
International Journal of Modern Physics E, 19(5&6), p.989 - 996, 2010/07
Times Cited Count：0 Percentile：0.00(Physics, Nuclear)We have measured quasi-elastic scattering cross sections in reactions of 
Ti, 
Cr, 
Fe, 
Ni and 
Zn + 
Pb, relating to Pb-based cold fusion reactions for super-heavy elements 104, 106, 108, 110 and 112, respectively. A thin target of Pb was bombarded by heavy-ion beams supplied from the JAEA tandem-booster accelerator with changing the beam energy in steps of 1.5 MeV. The barrier distributions were derived from the first derivative of the excitation functions measured at backward angles of 172
, 168 and 162. The centroid of the barrier distributions showed a deviation from several predicted barrier heights toward the low energy side. The shape of the barrier distributions was well reproduced by the results of a coupled-channel calculation taking account of the coupling effects of the collective vibrational excitations in the projectile and target nuclei. We have recently obtained similar results in heavier reactions of 
Ge and 
Kr + Pb.
Aritomo, Yoshihiro
International Journal of Modern Physics E, 19(5&6), p.813 - 824, 2010/06
Times Cited Count：0 Percentile：0.00(Physics, Nuclear)We analyzed experimental data obtained for the mass distribution of fission fragments in the reactions 
S+
U and 
Si+U at several incident energies, which were performed by the JAEA group. Using the dynamical model with the Langevin equation, we precisely investigate the incident energy dependence of the mass distribution of fission fragments. We also consider the fine structures in the mass distribution of fission fragments caused by the nuclear structure at a low incident energy. It is explained why the mass distribution of fission fragments has different features in the two reactions. The fusion cross sections are also estimated.
Maruyama, Toshiki; Chiba, Satoshi; Tatsumi, Toshitaka*
International Journal of Modern Physics E, 17(9), p.1774 - 1789, 2008/10
Times Cited Count：0 Percentile：0.00(Physics, Nuclear)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 condensation, and hadron-quark phase transition. During FOPT the mixed phases appear, where matter exhibits non-uniform structures called "Pasta" structures due to the balance of the Coulomb repulsion and the surface tension between two phases. We treat these effects self-consistently, properly taking into account of the Poisson equation and the Gibbs conditions. Consequently, they make the EOS of the mixed phase closer to that of Maxwell construction due to the Debye screening. This is a general feature of the mixed phase consisting of many species of charged particles. The EOS of hadron-quark mixed phase is particularly important for the maximum mass of compact stars, where we can see another interesting and novel effect that hyperons are suppressed in the hadron-quark mixed phase.
Terranova, F.*; Bulanov, S. V.; Esirkepov, T. Z.; Kiriyama, Hiromitsu; Tajima, Toshiki; Collier, J. L.*; Migliozzi, P.*; Pegoraro, F.*
International Journal of Modern Physics B, 21(3&4), p.351 - 360, 2007/02
In the forthcoming decades, the physics of massive neutrinos will pose unprecedented challenges to traditional acceleration techniques. In this talk we revise the main motivations for pursuing neutrino oscillation studies with novel neutrino sources and, particularly, we consider the opportunities offered by laser-plasma accelerators. The existence of efficient ion acceleration regimes in collective laser-plasma interactions opens up the possibility to develop neutrino and, more generally, high-energy physics facilities in conjunction with projects for inertial confinement nuclear fusion (ICF) and neutron spallation sources. Moreover, parametric amplification techniques allow pulse compression implementations that do not fall in contradiction with current designs for ICF drivers. We discuss the conditions under which these efficient regimes can be put into operation and the perspectives for their empirical verification.
Noda, Akira*; Nakamura, Shu*; Iwashita, Yoshihisa*; Shirai, Toshiyuki*; Tongu, Hiromu*; Soda, Hikaru*; Daido, Hiroyuki; Mori, Michiaki; Kado, Masataka; Sagisaka, Akito; et al.
International Journal of Modern Physics B, 21(3&4), p.319 - 330, 2007/02
Laser ion production has been studied for downsizing of the accelerator dedicated for cancer therapy. For optimization of various parameters such as pre-pulse condition, target position, laser spot size on target, laser pulse width and so on, time of flight (TOF) measurement utilizing the detected signal by a plastic scintillation counter played an essential role for real time measurement. Protons up to 900 keV and 600 keV are produced from the thin foil targets of Ti 3 micron and 5 micron in thickness, respectively. Modification of the energy distribution of the laser-produced ions with Maxwell distribution by utilizing an RF electric field synchronized to the pulse laser, which is the rotation of the ion beam in the longitudinal phase space (phase rotation), has been demonstrated for the first time.
Mori, Michiaki; Kando, Masaki; Daito, Izuru; Kotaki, Hideyuki; Hayashi, Yukio; Ogura, Koichi; Sagisaka, Akito; Esirkepov, T. Z.; Nakajima, Kazuhisa; Daido, Hiroyuki; et al.
International Journal of Modern Physics B, 21(3&4), p.407 - 414, 2007/02
Times Cited Count：0 Percentile：0.00(Physics, Applied)The quasi-monoenergetic electron beam produced by intense laser-plasma interaction was observed at plasma densities from 
to 
. The terawatt laser beam was focused by using an off-axis parabolic mirror with f=648 mm. We observed quasi-monoenergetic electron beams in the forward direction. The peak energy of quasi-monoenergetic component of the electron beam was increased from 9 MeV to 
20 MeV with a energy spread of 20
increasing the plasma density from to . However, the quasi-monoenergetic component of the electron beam disappeared at a plasma density of 
, and non-equilibrium (non Maxwellian) spectrum of the electron beam was observed. The table-top laser driven fs quasi-monoenergetic electron beam which is applicable to variety of fields has been demonstrated.
bands in 
AuZhang, Y. H.*; Zhou, X. H.*; He, J. J.*; Liu, Z.*; Fang, Y. D.*; Guo, W. T.*; Lei, X. G.*; Guo, Y. X.*; Ndontchueng, M. M.*; Ma, L.*; et al.
International Journal of Modern Physics E, 15(7), p.1437 - 1445, 2006/10
Times Cited Count：3 Percentile：27.42(Physics, Nuclear)Search for low-spin signature inversion in the bands in odd-odd Au have been made through in-beam 
-ray spectroscopy techniques. The bands in the three nuclei have been identified and extended up to high-spin states. In particlular, the interband connection between the band and the ground-state band in 
Au have been established, leading to a firm spin-and-parity assignment for the band. The low-spin signature inversion is found in the bands in Au.
Ebihara, Kenichi
International Journal of Modern Physics C, 17(1), p.53 - 64, 2006/01
Times Cited Count：0 Percentile：0.00(Computer Science, Interdisciplinary Applications)A liquid-gas model of lattice-gas is made by adding long-range interaction to lattice-gas and can simulate phase separation similar to that in the van der Waals' liquid-gas theory. This liquid-gas model can generate a circular dense-phase in the rare phase. In this paper, I simulate the deformation of the circular dense-phase by external force using the two types of liquid-gas models of lattice-gas, which are distinguished by the type of long-range interaction. It is observed in the simulation results that one type of model shows the valid deformation and the other shows the unphysical deformation. Futhermore it is found by numerical experiments that this difference of the deformation is caused by dynamical pressure anisotropy of the liquid-gas model of lattice-gas.
Ebihara, Kenichi; Watanabe, Tadashi
International Journal of Modern Physics B, 17(1-2), p.113 - 117, 2003/01
no abstracts in English
Yokota, Terufumi
International Journal of Modern Physics B, 15(26), p.3409 - 3417, 2001/10
Times Cited Count：0 Percentile：0.00(Physics, Applied)no abstracts in English
-ray burstsMao, G.; Chiba, Satoshi; Greiner, W.*; Oyamatsu, Kazuhiro*
International Journal of Modern Physics E, 9(2), p.185 - 192, 2000/04
Times Cited Count：0 Percentile：0.00(Physics, Nuclear)no abstracts in English
