Nuclide with spin quantum number
\(I \gt ½\) and a non-spherical distribution of charge in the nucleus giving rise to a
nuclear electric quadrupole moment (
\(eQ\)).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 701 (https://doi.org/10.1515/pac-2019-0203)