spin

of a nucleus
synonym: nuclear spin
https://doi.org/10.1351/goldbook.08418
Intrinsic angular momentum of a nucleus (or other sub-atomic particle).
Notes:
  1. The magnitude of nuclear spin is \((h/2\pi)\sqrt{I(I + 1)}\) where \(I\) is the spin quantum number and \(h\) is the Planck constant.
  2. In nuclear magnetic resonance spectroscopy, only nuclei with spin \(I \gt 0\) are observable.
  3. The spin of a nucleus is dependent on the numbers and alignments of the spins of its individual protons and neutrons.
  4. Nuclei with a spin of \(½\) generate the simplest nuclear magnetic resonance spectra and are thus the most commonly studied.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 705 (https://doi.org/10.1515/pac-2019-0203)