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Volume 341 - The 20th International Workshop on Neutrinos (NuFACT2018) - Wg 5
Average CsI neutron density distribution from COHERENT data
M. Cadeddu,* C. Giunti, Y. Li, Y. Zhang
*corresponding author
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Pre-published on: 2019 August 23
Published on: 2019 December 12
Using the coherent elastic neutrino-nucleus scattering data of the COHERENT experiment, we determine for the first time the average neutron rms radius of $^{133}\textrm{Cs}$ and $^{127}\textrm{I}$. We obtain the practically model-independent value $R_{n}=5.5{}^{+0.9}_{-1.1}\,\textrm{fm}$ 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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