Eigenstates of the time-dependent density-matrix theory
Kyorin University School of Medicine, 181-8611, Mitaka, Tokyo, Japan
2 Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, F-91406, Orsay Cedex, France
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An extended time-dependent Hartree-Fock theory, known as the time-dependent density-matrix theory (TDDM), is solved as a time-independent eigenvalue problem for low-lying 2 + states in 24O to understand the foundation of the rather successful time-dependent approach. It is found that the calculated strength distribution of the 2 + states has physically reasonable behavior and that the strength function is practically positive definite though the non-Hermitian Hamiltonian matrix obtained from TDDM does not guarantee it. A relation to an Extended RPA theory with hermiticity is also investigated. It is found that the density-matrix formalism is a good approximation to the Hermitian Extended RPA theory.
© Società Italiana di Fisica and Springer-Verlag, 2004