Mitsuru Tohyama

Quadrupole resonances in unstable oxygen isotopes in time-dependent density-matrix formalism

Abstract The strength functions of quadrupole modes in the unstable oxygen isotopes 22 O and 24 O are calculated using an extended version of the time-dependent Hartree–Fock theory known as the time-dependent density-matrix theory (TDDM). It is found that TDDM gives the lowest quadrupole states which are energetically shifted upward and become significantly collective due to the coupling to two-body configurations. It is pointed out that these features of the lowest quadrupole states are similar to those obtained in the quasi-particle random phase approximation.

Dipole resonances in oxygen isotopes in time-dependent density-matrix theory

The strength functions of isovector dipole resonances in the even oxygen isotopes 18∼24 O are calculated by using an extended version of the timedependent Hartree-Fock theory known as the time-dependent density-matrix theory (TDDM). The results are compared with recent experimental data and also with a shell-model calculation. It is found that the observed isotope dependence of low-lying dipole strength is reproduced in TDDM when the strength of the residual interaction is appropriately chosen. It is also found that there is a difference between the TDDM prediction and the shell-model calculation for 24 O.

Two-body dissipation effects on the synthesis of superheavy elements

To investigate the two-body dissipation effects on the synthesis of superheavy elements, we calculate low-energy collisions of the

Progress in Many Body Theory with the Equation of Motion method. Time dependent Density Matrix meets Self-Consistent RPA. Applications to solvable Models

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Spurious modes in Extended RPA theories

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Fragmentation of electric dipole strength inN=82isotones

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Approximate ground state of the Lipkin model hamiltonian in density-matrix formalism

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Truncation scheme of time-dependent density-matrix approach

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Quantum Study of a Trapped Dipolar Fermi Gas

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Extended RPA with ground-state correlations

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