The effects connected with the intermolecular relaxation in the coupled nuclear systems are studied theoretically. It was shown that, because of general properties of nuclear-spin systems, the number of parameters necessary to describe the relaxation process is reduced reduced substantially. Moreover, the structure of nuclear system and the relaxation process parameters are to a large extent se...

α-decay half-lives for Te and Xe close above the doubly-magic Sn are calculated from systematic double-folding potentials. The derived α preformation factors are compared to results for Po and Rn above the doubly-magic Pb. α-decay energies of Qα = 5.42 ± 0.07MeV and 4.65 ± 0.15MeV are predicted for Te and Xe; the corresponding half-lives are T1/2 ≈ 5 ns for Te and of the order of 60μs for Xe. A...

The finite-nuclear-size correction to the atomic energy levels is sufficiently well determined by the root-meansquare (rms) radius of the nucleus. The uncertainty due to this correction has usually been estimated by adding (quadratically) two errors, one obtained by varying the rms radius within its error bar, and the other obtained by changing the nuclear charge distribution from the Fermi-typ...

The structure of the half-integer rectilinear disclination line within the framework of the Landau-de Gennes effective theory of nematic liquid crystals is investigated. The consistent perturbative expansion is constructed for the case of L2 6= 0. It turns out that such expansion can be performed around only a discrete subset of an infinite set of the degenerate zeroth order solutions. These so...

The energy level displacements of the excited nl states of pionic hydrogen and the contribution of the ns → 1s transitions to the shift of the energy level of the ground state of pionic hydrogen, caused by strong low–energy interactions, are calculated within a quantum field theoretic, relativistic covariant and model–independent approach. E–mail: [email protected], Tel.: +43–1–58801–1426...

Objective(s): The purpose of this research is to study the effect of beta spectrum on absorbed fraction ( ) and to find suitable analytical functions for beta spectrum absorbed fractions in spherical and ellipsoidal volumes with a uniform distribution for several radionuclides that are commonly used in nuclear medicine.Methods: In order to obtain the beta particle absorbed fraction, Monte Carlo...

The γ-ray de-excitations following the β-decay of Ga and the β-n decay of Ga have been studied. The radioactive species were produced using the PARRNe on-line mass-separator installed at the IPN Orsay Tandem accelerator. Two γ-lines were attributed to Ge with the aid of β-γ and γ-γ coincidences. The Z identification of the γ-lines was provided by time analysis of a buid-up/decay cycle. The exci...

recent developments in hydrogen production by thermochemical water decomposition are reported,with an emphasis on hydrogen production from non-fossil energy sources such as nuclear and solar. numerousdevelopments have been made on sulphur-iodine, copper-chlorine and other thermochemicalcycles. efforts are described to lower the temperatures required in thermochemical cycles, so as to broadenthe...