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Tetrahedral intrinsic structure of Oxygen-16 revisited by C J Halcrow; N S Manton is a Physics and Astronomy article available to read on EtoBox.

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## Abstract A model for vibrational and rotational excitations of an intrinsic tetrahedral structure of the Oxygen-16 nucleus has been investigated, building on classic work of Wheeler, Dennison and Robson. Tetrahedral A- and F-phonons are treated harmonically, but the E-phonon dynamics is extended to dynamics on an E-manifold of configurations of four α-particles. This allows for tunnelling between the tetrahedral configuration and its dual, through a square configuration, and lifts the parity doubling that would otherwise occur. Unlike in earlier models, including the algebraic cluster model, the E-phonon frequency is taken to be about half the F-phonon frequency, which in turn is about half the A-phonon frequency. As a result, the first-excited 0^+^ state is a 2-phonon, E-manifold excitation, whereas the lowest 2^+^ and 2^−^ states are 1-phonon, E-manifold excitations. Coriolis contributions to the rotational energy of states with F-phonons are significant. Altogether, rotational bands are constructed based on vibrational states with up to four phonons, and with spin/parity up to 9^−^. Nearly all the observed states of Oxygen-16 are accommodated, up to 20 MeV and partly beyond.

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Author

C J Halcrow; N S Manton

Publisher

IOP Publishing

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)