[en] A study of the systematics of B(E3;0₁⁺→3₁^-) values for nuclei throughout the Periodic Table shows clear enhancements at certain neutron numbers. These neutron numbers are in remarkably good agreement with those predicted by Strutinsky-type calculations to be likely candidates for static octupole deformation. The comparison with predicted proton numbers is more ambiguous

[en] The experimental and theoretical evidence for octupole collectivity in nuclei is reviewed. Recent theoretical advances, covering a wide spectrum from mean-field theory to algebraic and cluster approaches, are discussed. The status of experimental data on the behaviour of energy levels and electric dipole and electric octupole transition moments is reviewed. Finally, an outlook is given on future prospects for this field. (topical review)

[en] Energy levels and transition rates for electric-dipole (E1), electric-quadrupole (E2), magnetic-dipole (M1), and magnetic-quadrupole (M2) transitions among the lowest 159 levels arising from the $n⩽<!--\; ???\; -->5$ configurations in Kr XXV are calculated through two state-of-the-art methods, i.e. second-order many-body perturbation theory (MBPT) and multi-configuration Dirac-Fock (MCDF) method. In the latter calculation, valence-valence and the 2p, 2s core-valence correlations are taken into account. A parallel calculation using the standard relativistic configuration-interaction (RCI) method is also carried out to assess the improvement from the inclusion of second-order many-body perturbation. The present MBPT and MCDF results are compared with available experimental and other theoretical values. They are believed to be the most comprehensive and accurate ones to date. (papers)

[en] E1 and M1 strength functions were derived from recent measurements and renormalization of existing data in the literature for the mass region A = 20 to 240. Comparisons with existing models were made. 2 figures

[en] Collective and microscopic properties of the low-lying, scissors-like, M1 excitations are studied. The collective features are analyzed in RPA using an energy-weighted M1 sum rule. (author)

[en] Studies of the M1-E2 interference effect in the mixed-type forbidden lines 461.5, 647.6, and 875.5 nm of Bi I are reported. A special computer program considering the interference effect was designed to obtain the predicted contours of the Zeeman structures of the lines. By variation of free parameters describing the line shapes and the electric-quadrupole admixtures, the calculated profiles were fitted to the recorded spectra. The E2 admixtures found are (7.84±0.14)%, (17.5±0.4)%, and (0.70±0.11)% for the 461.5, 647.6, and 875.5 nm lines, respectively. Our results are compared with recent theories and other experiments

[en] Spectroscopical properties of the platinum, mercury, and lead isotopes are studied within the Hartree-Fock plus BCS framework with the finite range density-dependent Gogny force. These properties are also studied beyond mean-field theory by combining the use of generator-coordinate-method-like wave functions with the angular momentum projection technique as to generate many-body correlated wave functions that are at the same time eigenstates of the angular momentum operator. We apply this formalism to the calculation of reduced transition probabilities B(E3) from the lowest-lying octupole collective state to the ground state of several isotopes of the platinum, mercury, and lead nuclei whose experimental B(E3) values present a peculiar behavior. The projected calculations show a large improvement over the unprojected ones when compared with the experimental data. The unprojected calculations are unable to predict any structure in the B(E3). copyright 1996 The American Physical Society

[en] We show that it is possible to generate Einstein–Podolsky–Rosen (EPR) entangled radiation using an atomic reservoir controlled by coherent population trapping. A beam of three-level atoms is initially prepared in near-coherent population trapping (CPT) state and acts as a long-lived coherence-controlled reservoir. Four-wave mixing leads to amplification of cavity modes resonant with Rabi sidebands of the atomic dipole transitions. The cavity modes evolve into an EPR state, whose degree of entanglement is controlled by the intensities and the frequencies of the driving fields. This scheme uses the long-lived CPT coherence and is robust against spontaneous emission of the atomic beam. At the same time, this scheme is implemented in a one-step procedure, not in a two-step procedure as was required in Phys. Rev. Lett. 98 (2007) 240401. (fundamental areas of phenomenology (including applications))

[en] A differential equation in l for hydrogenic radial dipole matrix elements is generated from the recursion relations of Infeld and Hull [Rev. Mod. Phys. 23, 31 (1951)]. The equation is valid for all (n,n')much-gt 1, for all |Δn|ieq|n'-n|, and for bound-free transitions from excited states. Approximate solutions are obtained for the case l much-lt n and are found to be equivalent to those of other workers when |Δn|much-gt 1. We also present a power-series solution in l good for all |Δn|. General features of the dependence of the matrix elements on l are explained

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