Masayuki Matsuzaki

Relativistic mean field description for the shears band mechanism in 84 Rb

For the first time, the Relativistic Mean Field (RMF) model is applied to the shears band recently observed in

Critical endpoint in the Polyakov-loop extended NJL model

_{37}^{84}

Chiral phase transition in an extended NJL model with higher-order multi-quark interactions

Rb. Signals of the appearance of the shears mechanism, such as smooth decreases of the shears angle and of the

Determination of QCD phase diagram from the imaginary chemical potential region

B

Wobbling motion in atomic nuclei with positive gamma shapes

(M1)/

Vector-type four-quark interaction and its impact on QCD phase structure

B

Nuclear wobbling motion and electromagnetic transitions

(E2) ratio with keeping the nearly constant tilt angle, are well reproduced. Thus it is shown that the microscopic RMF model can nicely describe the shears band in this nucleus.

Competing proton and neutron alignments in neutron-deficient Xe-nuclei

Abstract The critical endpoint (CEP) and the phase structure are studied in the Polyakov-loop extended Nambu–Jona-Lasinio model in which the scalar type eight-quark ( σ 4 ) interaction and the vector type four-quark interaction are newly added. The σ 4 interaction largely shifts the CEP toward higher temperature and lower chemical potential, while the vector type interaction does oppositely. At zero chemical potential, the σ 4 interaction moves the pseudo-critical temperature of the chiral phase transition to the vicinity of that of the deconfinement phase transition.

Spatial structure of quark Cooper pairs in a color superconductor

Abstract The chiral phase transition is studied in an extended Nambu–Jona-Lasinio model with eight-quark interactions. Equations for scalar and vector quark densities, derived in the mean field approximation, are nonlinear and mutually coupled. The scalar type nonlinear term hastens the restoration of chiral symmetry, while the scalar–vector mixing term makes the transition sharper. The scalar type nonlinear term shifts the critical endpoint toward the values predicted by lattice QCD simulations and the QCD-like theory.

Meson mass at real and imaginary chemical potentials

We test the reliability of the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model, comparing the model result with the lattice data at nonzero imaginary chemical potential. The PNJL model with the vector-type four-quark and scalar-type eight-quark interactions reproduces the lattice data on the pseudocritical temperatures of the deconfinement and chiral phase transitions. The QCD phase diagram in the real chemical potential region is predicted by the PNJL model. The critical end point survives, even if the vector-type four-quark interaction is taken into account.