Lu Da-Hai

Extended Quark Potential Model from Random Phase Approximation

The quark potential model is extended to include the sea quark excitation using the random phase approximation (RPA). The effective quark interaction preserves the important Quantum Chromodynamics (QCD) properties -- chiral symmetry and confinement simultaneously. A primary qualitive analysis shows that the

Explicit Expression of Seniority Particle Operator and Its Properties in Quasi-spin Theory

\pi

Structure of D Pair in Collective States of Nuclei

meson as a well-known typical Goldstone boson and the other mesons made up of valence

SU(3)F Meson Mass Formula from Random Phase Approximation

q\bar{q}

Operatorized Bogoliubov Transformation and Seniority Mixing in Collective States of Nuclei

quark pair such as the

Charge Exchange Component of n-p Interactions

\rho

Pair Excitations in Even-Even Nuclei*

meson can also be described in this extended quark potential model.The quark potential model is extended to include the sea quark excitation using the random phase approx-imation. The effective quark interaction preserves the important QCD properties - chiral symmetry and confinementsimultaneously. A primary qualitative analysis shows that the π meson as a well-known typical Goldstone boson andthe other mesons made up of valence qq quark pair such as the ρ meson can also be described in this extended quarkpotential model.

An Understanding of the Meaning Behind Boson-Description in the Collective Motion of Nuclei

The explicit expression of the seniority particle operator and its properties in the quasi-spin theory of nuclear physics is presented in this paper. The seniority particle operator can be used to construct D-pair in the microscopic theory of interacting boson model to avoid the seniority mixing problem.

The Structure of S Pair in Collective States (II)

As a successive work a modified D pair independent of the S pair treated in our previous papers is introduced to avoid the seniority mixing problem. The structure amplitudes of this D pair and S pair are determined simultaneously and self-consistently by iteration.

FRACTIONAL PARENTAGE COEFFICIENTS FOR COMPOSITE PAIRS

We present an SU(3)F meson mass formula from random phase approximation. Both the mesons of ground-state pseudoscalar octet and ground-state vector octet are described quite well by this mass formula. We also estimate the current and constituent quark masses from the naive quark model and the PCAC relation.