[en] A fully relativistic, gauge invariant, and nonperturbative calculation of the Δ⁺⁺ magnetic moment, μ_Δ++ is made using equal-time commutation relations (ETCRs) and the dynamical concept of asymptotic SU_F(2) symmetry and realization. The author finds that μ_δ++ = 2.04μ_p, where μ_p is the proton magnetic moment and the Δ mass is 1.232 GeV/c²

[en] General formulas are derived for the computation of scattering amplitudes for electron-laser pulse processes. The results make use of standard Feynman-Dyson S-matrix techniques, except the Furry interaction picture is used rather than the Dirac interaction picture. The laser pulse is described quantum-mechanically as a coherent state wave-packet. The electron is represented by wave-packet solutions of the Dirac equation in the case of scattering boundary conditions, or by Volkov wave-packets when one desires nonscattering boundary conditions. The scattering amplitudes for the processes of stimulated Compton scattering, inverse bremsstrahlung, and pair production in a laser pulse are given for scattering and nonscattering boundary conditions. The existence of entirely new, quantum-electrodynamical, nonlinear corrections for any electron-laser pulse process is demonstrated

[en] The weak N - Δ axial-vector transition amplitude (Δ⁺|A^μ_π⁺|n) - important in N^* production - is examined using a broken symmetry algebraic approach to QCD. The authors calculate the form factor C^A₅ and compare their results with experiment and other theoretical models

[en] A numerical analysis of some spherically symmetric containment vessel problems is accomplished using the one-dimensional hydrodynamics code SIN. The typical problem involves a spherical steel vessel containing a detonating spherical charge of PBX-9404 at its center, with a mitigator (air or vermiculite) surrounding the charge. Two different vessels are considered - one having 17.6-cm inner radius and 0.635-cm-thick shell and the other having an 88.9-cm inner radius and a 6.35-cm-thick shell. Three different charge masses are used: 15.82 g, 8.17 kg, and 27.24 kg. In each configuration considered, the displacement of the shells and the pressure in the air at the inner wall are obtained as a function of time. The results agree well with experimental data. A simple theoretical model is also considered and gives solutions in reasonable agreement with the numerical results

[en] A fully relativistic, gauge invariant, and nonperturbative (but approximate) calculation of the Δ⁺ → p + γ scalar transition form factor h₁(q²) ∝ G*_c(q²) is performed using equaltime commutation relations (ETCRs) and the dynamical concept of asymptotic SU_F(2) symmetry and asymptotic level realization. We also compute the single-pion electroproduction scalar amplitude S₁ + (q²)

[en] We present a formalism for the calculation of scattering amplitudes for electron-laser pulse processes. Our results make use of standard Feynman-Dyson S-matrix techniques and the Lehmann-Symanzik-Zimmermann reduction formalism. The laser pulse is described quantum mechanically as a coherent-state wave packet. The electron is represented by wave-packet solutions of the Dirac equation in the case of scattering boundary conditions, or by Volkov wave packets when we desire nonscattering boundary conditions. We demonstrate the existence of new, nonlinear corrections of a quantum-mechanical nature for the process of stimulated Compton scattering

[en] Radiative transitions between the ground state pure q bar q vector and pseudoscalar mesons are studied non-perturbatively using equal-time commutation relations (ETCRs) and the dynamical concept of asymptotic SU_F(N) symmetry. A number of predictions are made including Λ(D*⁰ → D⁰γ), Λ(D*⁺ → D⁺γ), etc. In addition, hadronic partial widths of D*⁺ and D*⁰ are calculated. The importance of the SU_F(N) singlet piece of the electromagnetic current when considering radiative decays and the experimental value of Λ(K*⁰ → K⁰γ)/Λ(K*⁺ → K⁺γ) is pointed out. 6 references, 2 tables

[en] In this article, I wish to consider the ground state and radially excited state pseudoscalar and vector mesons and also the Δ⁺ → Pγ decay in the context of a simple algebraic model which is of a non-perturbative form. The model makes use of the well-known Gell-Mann SU(N) X SU(N) (N=2 or 4 in this article) algebras, assumed to be valid in broken symmetry. In addition, the dynamical concepts of algebraic (level) realization and asymptotic SU(N) are introduced and utilized in the infinite momentum frame limit. Special attention is given to deriving a number of mass-mixing angle constraints involving the 0^-+ and the 1^-- mesons in the ground state and radially excited states and to relating the form factors Gsup(*)sub(M) and Gsub(*)sub(E) which describe the Δ⁺ → Pγ decay to g sub(A(0))(the nucleon axial-vector coupling constant) and ksub(p) and ksub(N) (the proton and neutron anomalous magnetic moments). (orig.)

[en] The scattering amplitudes for the processes of inverse bremsstrahlung and pair production in a laser pulse are given for scattering and nonscattering boundary conditions

[en] Short communications only