Scissors modes: The elusive breathing overtone

Scissors modes: The first overtone

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...

Scissors modes in crystals with cubic symmetry

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 ...

Breathing modes and compressibilities

In this talk, I first discuss the relation between the compressibility of bulk nuclear matter and the frequency of the giant monopole vibration of finite nuclei, and emphasize that this relation is by no means direct, contrary to naive expectation based on classical reasoning. Quantum mechanics and the finite size of nuclei play an important role here, as exemplified by the study of the monopol...

Quartz-enhanced photoacoustic spectroscopy exploiting tuning fork overtone modes

Radial Breathing Modes in Cosmochemistry and Meteoritics

Introduction: One area of continuing interest in cosmochemistry and meteoritics (C&M) is the identification of the nature of Q-phase, although some researchers in C&M are not reporting relevant portions of Raman spectral data [e.g. 1]. Q is the unidentified carrier of noble gases in carbonaceous chondrites (CCs). Being carbonaceous, the focus has been on any number of Q-candidates arising from ...