Alpha-Particle Models forNe20andMg24

Applications of point group symmetries in light nuclei

“…The experimental spectrum of ^^Ne shows a definite K^=2 band beginning at 4.97 MeV. As has been noted previously (24), the only rigid^-structure that can predict this band is the distorted tetrahedron ( Besides the two doubly-degenerate E vibrations, the only normal mode not observed is the B^ "twisting" vibration which describes the possible os cillation of the two dumbbells about the z axis. This mode is denoted or in Figure 2.12.…”

“…previous papers (19)(20)(21)(22)(23)(24). However, by allowing some variation in these pa rameters, one can obtain better agreement with experiment and also study the variation of the effective rotational parameters with changing normal vi brations .…”

“…energy spectrum, the b|tetrahedron(Figure 2.l6c) is found to be in better agreement with the experimental electron scattering form factors and so should be the correct structure. Other possible configurations have been eliminated previously(24). The calculation of the energy levels for this structure is like that for the asymmetric rotor of Davydov and Fillipov in(41, pp.…”

“…The only experimental evidence available for comparison at that time was the binding energies of these nuclei, and these quantities agreed quite well in theory (4,10). However, quite recent calculations of the electron scattering form factors using these bipyramidal shapes have shown that they are in rather poor agreement with experiment (34,35)-Furthermore, nonbipyramidal shapes have been shown to yield better agreement with the observed energy levels(23,24). Since the time of these calculations, much addition al experimental Information has been obtained; so it was felt that all pos sible configurations for the 4N nuclei in the 2s-1d shell should be recon sidered.…”

Applications of point group symmetries in light nuclei

“…previous papers (19)(20)(21)(22)(23)(24). However, by allowing some variation in these pa rameters, one can obtain better agreement with experiment and also study the variation of the effective rotational parameters with changing normal vi brations .…”