Abstract
We complement the concept of the invariant spin field (ISF) in storage rings by defining the invariant polarisation‐tensor field (ITF) for spin‐1 particles and we suggest how to calculate it by stroboscopic averaging or directly from the invariant spin field. The ITF the ISF are used to construct equilibrium spin density‐matrix fields, and thereby offer a clean framework for describing equilibrium ensembles of spin‐1 particles such as deuterons in storage rings.
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