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Average CsI Neutron Density Distribution from COHERENT Data.

M Cadeddu1, C Giunti2, Y F Li3

  • 1Dipartimento di Fisica, Università degli Studi di Cagliari, and INFN, Sezione di Cagliari, Complesso Universitario di Monserrato-S.P. per Sestu Km 0.700, 09042 Monserrato (Cagliari), Italy.

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Summary
This summary is machine-generated.

This study determined the neutron radius for cesium-133 and iodine-127 using COHERENT experiment data. Results provide insights into nuclear structure and coherence effects.

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Area of Science:

  • Nuclear Physics
  • Particle Physics

Background:

  • Neutrino-nucleus scattering is a key probe of nuclear structure.
  • The COHERENT experiment provides precise measurements of coherent elastic neutrino-nucleus scattering (CEvNS).

Purpose of the Study:

  • To determine the average neutron root-mean-square (rms) radius for Cesium-133 and Iodine-127.
  • To investigate the nuclear structure suppression of coherence in CEvNS.

Main Methods:

  • Analysis of coherent elastic neutrino-nucleus scattering (CEvNS) data from the COHERENT experiment.
  • Application of symmetrized Fermi and Helm form factors for model-independent analysis.

Main Results:

  • The neutron rms radius for Cesium-133 and Iodine-127 was determined as R_n = 5.5_{-1.1}^{+0.9} fm.
  • A 2.3 sigma evidence for nuclear structure suppression of full coherence was observed.

Conclusions:

  • The study provides the first practically model-independent measurement of neutron radii for ^{133}Cs and ^{127}I.
  • The findings highlight the importance of nuclear structure effects in neutrino scattering experiments.