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Trace isotopes set the neutron horizon of liquid argon

  • Yasser Maghrbi
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Abstract

Near 57 keV, destructive interference makes argon-40 almost transparent to neutrons. The 0.4% of argon-36 and argon-38 in natural argon then supply over 90% of its opacity, amplified 230-fold. Published transmission data rule out the argon-36 evaluation FLUKA uses by default, even with every other isotope made transparent, and bound its cross section in the window to 2-11 b. In a DUNE-scale detector, switching to the data-consistent evaluations moves the fiducial fraction of argon-41 calibration captures by 9-13% while the total yield changes by only 2%: the effect is on where captures occur, not how many.

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Cite

BibTeXRIS
BibTeX
@misc{maghrbi2026trace,
  title = {{Trace isotopes set the neutron horizon of liquid argon}},
  author = {Yasser Maghrbi},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.37087},
  eprint = {2609.37087},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05767585v1},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Trace isotopes set the neutron horizon of liquid argon
AU  - Yasser Maghrbi
PY  - 2026
DA  - 2026/09/29
PB  - HAL
DO  - 10.48550/arxiv.2609.37087
UR  - https://hal.science/hal-05767585v1
AB  - Near 57 keV, destructive interference makes argon-40 almost transparent to neutrons. The 0.4% of argon-36 and argon-38 in natural argon then supply over 90% of its opacity, amplified 230-fold. Published transmission data rule out the argon-36 evaluation FLUKA uses by default, even with every other isotope made transparent, and bound its cross section in the window to 2-11 b. In a DUNE-scale detector, switching to the data-consistent evaluations moves the fiducial fraction of argon-41 calibration captures by 9-13% while the total yield changes by only 2%: the effect is on where captures occur, not how many.
ER  -