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Measurement of the total neutron cross section on argon in the 20 to 70 keV energy range

S. Andringa1, Y. Bezawada2, T. Erjavec2, J. He2, J. Huang2, P. Koehler3, M. Mocko3, M. Mulhearn2, L. Pagani2 et al. (ARTIE Collaboration)

L. Pagani2, E. Pantic2, L. Pickard2, R. Svoboda2, J. Ullmann3, and J. Wang2,4 (ARTIE Collaboration)

  • 1Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Avenida Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal
  • 2Department of Physics and Astronomy, University of California at Davis, Davis, California 95616, USA
  • 3Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 4Physics Department, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA

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Phys. Rev. C 108, L011601 – Published 7 July, 2023

DOI: https://doi.org/10.1103/PhysRevC.108.L011601

Abstract

The cross section for neutron interactions on argon is an important design and operational parameter for a number of neutrino, dark matter, and neutrinoless double beta decay experiments which use liquid argon as a detection or shielding medium. There is a discrepancy between the evaluated total cross section in the 20 to 70keV neutron kinetic energy region given in the ENDF database and a single measurement conducted by an experiment with a thin target (0.2 atoms/b) optimized for higher cross sections. This gives rise to significant uncertainty in the interaction length of neutrons in liquid argon. This discrepancy is now resolved by new results presented here from the Argon Resonance Transport Interaction Experiment (ARTIE), a thick target experiment (3.3 atoms/b) optimized for the small cross sections in this energy region.

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Phys. Rev. C 108, L011601– Published 7 July, 2023
  • Received 30 December 2022
  • Accepted 12 June 2023
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