Scissors modes were predicted in the framework of the two-rotor model. This model has an intrinsic harmonic spectrum, so that the level above the scissors mode, the first overtone, has excitation energy twice that of the scissors mode. Because the latter is of the order of 3 MeV in the rare-earth region, the energy of the overtone is below threshold for nucleon emission, and its width should re...

We recently suggested that the Scissors Mode (a collective excitation in which one system rotates with respect another one conserving its shape) can occur in crystals with axially symmetric atoms as a precession of these atoms around the anisotropy axis of their cells, giving rise to a form of dichroism. In the present paper we investigate how the Scissors Mode can be realized in crystals with ...

We investigate the segregation resulting from the competition between advection and shear-induced migration of suspensions in steady open flows. Herringbone channels form a concentration profile deviating from the particle focusing found in straight channels. Transients can result from a buckling instability during the onset of migration when particle-depleted fluid is injected into particle-ri...

such that the smaller polyhedra have pairwise disjoint interiors. Note that there is not an additional assumption, say, that the smaller polyhedra meet face to face. Two polyhedra P and Q are scissors congruent if there are dissections P = P1 ∪ ...∪Pn and Q = Q1 ∪ ...∪Qn such that each Pk is isometric to Qk. Sometimes, one requires that all the isometries are orientation-preserving, but in fact...