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Researchers have measured an upper limit on the nuclear Schiff moment of europium-153, a property that would indicate physics beyond the Standard Model. Using nuclear spin resonances in europium ions embedded in a crystal, they determined that the Schiff moment must be smaller than 1.7 × 10⁻⁸ e·fm³ with 95% confidence. This represents a constraint on potential new physics phenomena at the TeV energy scale.
Why it matters
This measurement helps constrain theories of particle physics beyond the Standard Model by limiting the extent of certain symmetry violations in atomic nuclei. The experimental approach using octupolar nuclei in solid-state systems offers a complementary method to search for new fundamental physics that could explain matter-antimatter asymmetry in the universe.
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⚠️ Preprint – Noch nicht peer-reviewed
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Abstract: The Schiff moment of a nucleus is a symmetry-violating nuclear moment that indicates new physics beyond the Standard Model. We place the limit, $|mathscr{S}({}^{153}$Eu)$| < 1.7 times 10^{-8}$ $e,$fm$^3$ (95% confidence), on the Schiff moment of the $^{153}$Eu nucleus, using nuclear spin resonances in two ensembles of oppositely-polarized $^{153}$Eu$^{3+}$ ions in a Y${}_2$SiO${}_5$ crystal. This measurement using octupolar nuclei in a mm-scale crystal constrains new physics at the TeV energy-scale.