Tetrahedral intrinsic structure of Oxygen-16 revisited
Authors
Halcrow, CJ
Manton, NS
Publication Date
2020-12-01Journal Title
Journal of Physics: Conference Series
ISSN
1742-6588
Publisher
IOP Publishing
Volume
1643
Issue
1
Language
en
Type
Article
This Version
VoR
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Halcrow, C., & Manton, N. (2020). Tetrahedral intrinsic structure of Oxygen-16 revisited. Journal of Physics: Conference Series, 1643 (1) https://doi.org/10.1088/1742-6596/1643/1/012136
Abstract
<jats:title>Abstract</jats:title>
<jats:p>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<jats:sup>+</jats:sup> state is a 2-phonon, E-manifold excitation, whereas the lowest 2<jats:sup>+</jats:sup> and 2<jats:sup>−</jats:sup> 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<jats:sup>−</jats:sup>. Nearly all the observed states of Oxygen-16 are accommodated, up to 20 MeV and partly beyond. Predictions for some so far unobserved states, especially those of unnatural parity, are made.</jats:p>
Keywords
Paper
Identifiers
jpcs_1643_1_012136, j16431136
External DOI: https://doi.org/10.1088/1742-6596/1643/1/012136
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333179
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Licence:
http://creativecommons.org/licenses/by/3.0/
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