Energy levels in the nucleus 156Dy through the 159Tb(p, 4nγ)156Dy reaction

Using the ¹⁵⁹Tb(p, 4nγ)¹⁵⁶Dy reaction at E_p = 27 to 51 MeV and standard on-line γ-ray spectroscopy methods, the energies and decay properties of members of various rotational bands in the nucleus ¹⁵⁶Dy have been investigated, i.e. the ground-state band up to 14_g⁺, the β-vibrational band up to 14_β⁺,the γ-vibrational band up to 11_γ⁺,and two other bands, one with odd-spin levels up to 11, the other with even-spin levels up to 10. The results are compared with various calculations in the framework of the collective model, and no satisfactory fit is obtained; possible improvements of the model to remove these discrepancies are suggested.     

1H NMR utilization of through-space effects. II—conformation of dienic ketones

The configurational and conformational assignments of the carbonyl group in the Z- and E-1-(3-substituted-5,5-dimethyl-2-cyclohexen-1-ylidene)-2-butanones are carried out using only the through-space effects of the carbonyl group. It is demonstrated that, regardless of the Z- or E-configuration or the nature of the substituent in position 3, the conformation of the carbonyl group is always s-cis.     

Non-ergodic instability and the quadrupolar glass state in K(CN) x Br1−x and (NaCN) x (KCN)1−x

Random strain fields, due to substitutional disorder, couple to translational and orientational dynamic modes in plastic crystals. One distinguishes the cases of weak and strong random fields. In weak fields, the crystal comes close to a structural phase transition. Then elastic restoring forces are weak while internal friction dominates. The resulting non ergodic instability marks the onset of a structural glass state. The evolution of the glass state is discussed within a selfconsistent theory. The results of an extensive numerical study are compared with experiment. In presence of strong random fields no instability occurs, and orientational freezing is a continuous process.     

Modules des differentielles en caracteristique p.

For a Nagata ring A, the module of absolute differentials is flat if and only if the morphism from A^P into A is flat with a socalled elementary fibre. For the proof strong modules and basic rings are defined and studied. A complete local ring is basic and produces strong modules in a natural way.