[en] A combined velocity and density dependent term is introduced in the Skyrme interaction in order to have an improved level density of the single-particle spectrum in ²⁰⁸Pb. The response function built on the Hartree-Fock ground states in the framework of the random phase approximation is calculated with a fast numerical method by working in coordinate space. Positions of many giant resonances are reproduced within 4 percent of the experimental values. The transition rates of the low-lying states are in general within 12 percent of the experimental values except for the 3^- state in ¹⁶O. Most of the energy-weighted sum rules are exhausted by the calculated strength of the giant resonances

[en] The short-range NN deformation potential is calculated in the MIT bag model with several corrections. The color van der Waals force is derived in the coupled channel formalism. The baryon spectrum is studied with the potentials fitted to meson masses. The production of multi-quark hadrons which decay to vector-meson pairs are studied in γγ reactions, hadronic collisions, J/psi radiative decays and relativistic heavy ion collisions. The feasibility of ⁸¹Br as a solar neutrino detector is studied by estimating the solar neutrino capture rate using information from the charge exchange reactions. Landau sum rules are applied to examine the Landau-Migdal parameters. An extended Skyrme-Landau interaction is being developed. Landau damping in the nuclear matter is being calculated. 14 references

[en] The fusion reactions of polarized deuterons are calculated in DWBA. The results show that the ''neutron-lean'' reactor is feasible. The quantum fluctuation around the two-phase Skyrme model is formulated. From the width of the Roper resonance, we determine the quark core radius to be approx. 0.4 fm. The size and shape of a Skyrme soliton in the two interacting Skyrmion system is calculated. The size shrinks at intermediate separation due to the NN dynamics. The production of Q² anti Q² mesoniums are predicted in J/psi radiative decays. It is proposed to measure the quadru-lepton signals in the relativistic heavy ion collisions in addition to the di-lepton signals as a viable means of detecting the quark gluon plasma. The glud ball transition amplitiudes are extracted from an SU(2) Monte Carlo calculation. The results are used to predict the glueball branching ratio in J/psi radiative decays. It helps us to pin down that theta(1700) is indeed a tensor glueball. Skyrme parametrization for the effective nucleon-nucleon interaction in nuclei is determined with the help of the Landau parameters. They can be used to calculate the spin excitations of the nucleus

[en] With the goal of understanding the complexity of QCD and the role of symmetry in dynamics, the authors studied a field theory called Valence QCD (VQCD) in which the Z graphs are forbidden so that the Fock space is limited to the valence quarks. The authors calculated nucleon form factors, matrix elements, and hadron masses both with this theory and with quenched QCD on a set of lattices with the same gauge background. Comparing the results of the lattice calculations in these two theories, the authors drew conclusions regarding the SU(6) valence quark model and chiral symmetry. While recognizing the goal of VQCD, Nathan Isgur disagrees on some of the conclusions the authors have drawn. The foremost objection raised in section 2 is to their suggestion that the major part of the hyperfine splittings in baryons is due to Goldstone boson exchange and not one-gluon-exchange (OGE) interactions. The logic of Isgur's objection is that VQCD yields a spectroscopy vastly different from quenched QCD and therefore the structure of the hadrons (to which hyperfine splittings in a quark model are intimately tied) is also suspect so no definite conclusions are possible. To put this into perspective it should be emphasized at the outset that spectroscopy is only one aspect of hadron physics examined in section 1. The authors have studied the axial and scalar couplings of nucleon in terms of F_A/D_A and F_S/D_S, the neutron to proton magnetic moment ratio μn/μp, and various form factors. None of these results reveal any pathologies of hadron structure and turn out to be close to the SU(6) relations, as expected. In fact this is what motivated the study of valence degrees of freedom via VQCD. In section 2 the authors address specific issues related to spectroscopy in VQCD. Isgur also presented more general arguments against the idea of boson exchange as a contributor to hyperfine effects. A cornerstone of his discussion is the unifying aspect of OGE in a quark model picture. The authors believe that it is also natural and economical to identify chiral symmetry as the common origin for much of the physics being discussed here. Therefore in section 3 the authors take the opportunity to sketch out an effective theory that may serve as a framework to interpret the numerical results of VQCD

[en] Investigations are proposed in the following areas: Chiral soliton description of hadron physics, Monte Carlo lattice gauge simulation, detection of quark gluon plasma in relativistic heavy ion collisions, phenomenology of exotic mesons and fermi-liquid theory of nuclei. An effective σ model lagrangian is used to study the nucleon static properties, the NN static potential and the baryon spectrum with vibration and rotation coupling in πN scatterings. In the projects involving Monte Carlo calculations, plans are made to evaluate the vacuum to glueball transition amplitudes and the nucleon form factors in the physical SU(3) case. Calculations are made of the ionization and regeneration rates of various high mass mesons to examine a proposal of detecting the quark gluon plasma via di-leptons and quadra-leptons. Efforts continue in searching for exotic mesons (Q² anti Q² mesons and glueballs in γγ reactions, hadronic collisions, J/psi radiative decays and anti NN annihilations. Last but not least, a proposal is made to employ a new Skyrme interaction to study the spin modes in nuclei, the particle-particle interactions, the optical potentials and carry out the renormalized random phase approximation calculations via particle-phonon coupling mechanism. 73 refs., 1 fig

[en] This review volume on topological and nontopological chiral solitons presents a global view on the current developments of this field in particle and nuclear physics. The book addresses problems in quantization, restoration of translational and rotational symmetry, and the field theoretical approach to solitons which are common problems in the field of solitons

[en] Progress is briefly described. The meson-nucleon scattering phase shifts are calculated for the Skyrme soliton with spin and isospin projections. The mixing of the S/sub 1/2/⁶ and S/sub 1/2/⁴ P/sub 3/2/² configurations in the MIT bag model is calculated and it shows a large effect. The production of Q² anti Q² mesoniums which decay to vector meson pairs are studied in γγ reactions, hadronic collisions and J/psi radiative decays. A possible measurement of the quark gluon plasma temperature in relativistic heavy ion collisions is proposed. The vacuum to glueball transition amplitudes are measured in a lattice gauge Monte Carlo calculation. Fusion reactions of the polarized deuterons are calculated in DWBA formalism. An extended Skyrme-Landau effective NN interaction is being developed so that nuclear structure calculations can be carried out. Publications are listed

[en] The authors calculate the quark orbital angular momentum of the nucleon from the quark energy-momentum tensor form factors on the lattice. The disconnected insertion is estimated stochastically which employs the Z₂ noise with an unbiased subtraction. This reduced the error by a factor of 4 with negligible overhead. The total quark contribution to the proton spin is found to be 0.30±0.07. From this and the quark spin content the authors deduce the quark orbital angular momentum to be 0.17±0.06 which is ∼ 34% of the proton spin. The authors further predict that the gluon angular momentum to be 0.20±0.07, i. e. approximately 40% of the proton spin is due to the glue

[en] The branching ratios and the ratios of the helicity amplitudes (x and y) of the process J/PSI → γ + (Q/sup 2/Q-bar/sup 2/)/sub 2/++ → γ + VV have been calculated. The branching ratio of the process J/PSI → γ + (Q/sup 2/Q-bar/sup 2/)/sub 2/++ → γ + rho/sup 0/rho/sup 0/ is quite compatible with recent experimental data and it's x and y values are different from the ones measured in the process J/PSI → γ + Θ → γ + etaeta (KK-bar). The processes of J/PSI → γ + (Q/sup 2/Q-bar/sup 2/)/sub 2/++ → γ + ωω, K/sup */K-bar/sup */ have large branching ratios and should be found in J/PSI radiative decays. The branching ratio of J/PSI → γ +(s/sup 2/s-bar/sup 2/)/sub 2/++ → γ + phiphi is calculated to be smaller than that of J/PSI → γ + (Q/sup 2/Q-bar/sup 2/)/sub 2/++ → γ [ rho/sup 0/rho/sup 0/ by a factor of --25

[en] There are two Landau sum rules for the particle-hole interaction parameters in nuclear matter. One is the isovector triplet (T=1,S=1) sum rule, the other is the isoscalar singlet (T=0,S=0) sum rule. Both of the sum rules are applied to examine several sets of Landau parameters which have been used on various occasions. It is found that the set with spin-independent parameters based on our present knowledge of the compression modulus, the effective mass and the symmetry energy and with the spin dependent parameters derived from meson exchanges seems to satisfy the sum rules fairly well