Average CsI neutron density distribution from COHERENT data

M. Cadeddu , C. Giunti , Y.F. Li , Y.Y. Zhang

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classification ✦ hep-ph hep-exnucl-exnucl-th

keywords coherentdatatextaverageneutroncoherencedensitydetermine

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Using the coherent elastic neutrino-nucleus scattering data of the COHERENT experiment, we determine for the first time the average neutron rms radius of $^{133}\text{Cs}$ and $^{127}\text{I}$. We obtain the practically model-independent value $ R_{n} = 5.5 {}^{+0.9}_{-1.1} \, \text{fm} $ using the symmetrized Fermi and Helm form factors. We also point out that the COHERENT data show a $2.3\sigma$ evidence of the nuclear structure suppression of the full coherence.

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Phenomenological implications of the high-precision COHERENT germanium CE$\nu$NS data
hep-ph 2026-05 unverdicted novelty 5.0

High-precision COHERENT germanium CEνNS data yields state-of-the-art constraints on the weak mixing angle, neutrino charge radii, germanium neutron radius, and non-standard neutrino interactions via global analysis wi...