[en] Calculations are reported of radiative and non-radiative decay rates for doubly excited states of the type 1s²nln'l' in Ar¹⁴⁺ with n and n' in the range 6 to 9. This type of configuration is expected to be formed in charge exchange collisions between Ar¹⁶⁺ and the neutral rare gases and the ratio between the radiative and the total decay rate is one of the experimentally accessible parameters. We show that the ratio is dependent on the proximity of the configuration to the 1s²n_l limits in Ar¹⁵⁺ and that the ratios decrease significantly as such limits are passed

[en] A group-theoretical method for the description of the giant dipole resonance in odd-mass nuclei is described and analytical expressions for the strength splitting are derived when nuclei exhibit axially symmetric deformation, corresponding to the SU(3)direct product U(2) limit of the interacting boson-fermion model

[en] The lifetime of a state involving an antiproton and a deuteron may well depend significantly on the total spin and the influence of explicit three-body dynamics. We begin a study of this question in the N-N-N system via the Faddeev equations with pair-wise interactions limited to s-wave separable forms. The separable N-N interaction is fitted to the low-energy behavior of the Graz N-N potential model. The separable N-N interaction in fitted to the low-energy N-N scattering data. Results are compared to those from an impulse approximation to the nuclear interaction which excludes three-body dynamical effects. We discuss the obtained nuclear energies and widths, the effects of annihilation, and the importance of three-body dynamics in the nuclear sector of the N-N-N system. We then treat the antiproton-deuteron atom. The strong interaction shifts and widths of the atomic levels of the antiproton-deuteron (p-d) atoms may well include effects from three-body dynamics. We calculate, within a simple three-body model, the strong interaction shifts and widths of the atomic levels. The nuclear p-d optical potential is obtained from a projected form of the Faddeev equations with the same separable s-wave two-body potentials used in the purely nuclear sector. The Coulomb potential is combined with the nuclear optical potential to obtain the atomic levels by solution of the p-d Schroedinger equation in momentum space. Results are compared to those obtained using an impulse approximation to the nuclear interaction which excludes three-body dynamical effects, allowing us to determine the relative importance of explicit three-body dynamics on the strong interaction shifts and widths of the p-d atoms

[en] Short note. 35 refs

[en] Short note. 3 refs

[en] Short note. 5 refs

[en] Short note. 2 refs.; 1 tab

[en] The authors constructed a new D = 4 teterotic string which combines the right-movers of the D = 4 fermionic string with the left-movers of the D = 10 N-S bosonic strings. Its gauge group is [SU(2)]⁶. The massless ground state of the string consists of D = 4 supergravity and super Yang-Mills bosons. The new string theory is tachyon-free, Lorentz invariant and super symmetric

[en] The backward cross section for electrodisintegration of ²H near threshold and the magnetic form factors of ³H and ³He are found to be in fair agreement with empirical values up to momentum transfers about 1 GeV/c, when calculated with the Argonne two-nucleon and Urbana model-VII three-nucleon interactions, exact (A=2) and variational or 34-channel Faddeev (A=3) wave functions, and a realistic current operator constructed from the Argonne υ₁₄ potential model. Below 1 GeV/c the exchange current contribution increases and above 1 GeV/c it strongly decreases the calculated electrodisintegration cross section. Second zeroes are predicted for the magnetic form factors of ³H and ³He at about 1.4 GeV/c. (orig.)

[en] Published in summary form only. 1 tab