Abstract
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}Cs and ^{127}I. We obtain the practically model-independent value R_{n}=5.5_{-1.1}^{+0.9} fm using the symmetrized Fermi and Helm form factors. We also point out that the COHERENT data show a 2.3σ evidence of the nuclear structure suppression of the full coherence.
Highlights
Dipartimento di Fisica, Universitadegli Studi di Cagliari, and INFN, Sezione di Cagliari, Complesso Universitario di Monserrato—S.P. per Sestu Km 0.700, 09042 Monserrato (Cagliari), Italy
Using the coherent elastic neutrino-nucleus scattering data of the COHERENT experiment, we determine for the first time the average neutron rms radius of 133Cs and 127I
We considered only the 12 energy bins from i 1⁄4 4 to i 1⁄4 15 for which the COHERENT Collaboration fitted the quenching factor in Fig. S10 of Ref. [1] and obtained the linear relation between the observed number of photoelectrons NPE and the nuclear kinetic recoil energy T given by NPE 1⁄4 1.17
Summary
Dipartimento di Fisica, Universitadegli Studi di Cagliari, and INFN, Sezione di Cagliari, Complesso Universitario di Monserrato—S.P. per Sestu Km 0.700, 09042 Monserrato (Cagliari), Italy. Using the coherent elastic neutrino-nucleus scattering data of the COHERENT experiment, we determine for the first time the average neutron rms radius of 133Cs and 127I.
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