{
  "abstract": "We report the measurement of the $^{39}$Ar specific activity of atmospheric argon using DArT, a low-background single-phase liquid-argon detector read out by cryogenic silicon photomultipliers, at the Canfranc Underground Laboratory (LSC) in Spain. DArT was first filled with atmospheric argon and then with a sample of underground argon of known radioactivity from the DarkSide-50 experiment. The underground argon serves as a background reference in this measurement, making the result robust because we do not rely on background simulations. We measure the $^{39}$Ar specific activity with both a cut-and-count method and a binned maximum-likelihood fit, yielding consistent results. We obtain $a_{\\text{AAr}}= 0.955 \\pm 0.008~\\text{Bq}/\\text{kg}$. This result agrees with previous measurements from other experiments and provides the most precise determination of the $^{39}$Ar specific activity in atmospheric argon to date. It also validates DArT as a key component of the DArTInArDM experiment at LSC, which aims to measure the $^{39}$Ar activity of the argon extracted from deep underground wells in Colorado (USA) for the Darkside-20k and LEGEND-1000 experiments at Laboratori Nazionali del Gran Sasso in Italy.",
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  "arxiv": "2609.39400",
  "author_total": 44,
  "authors": [
    {
      "name": "P Agnes"
    },
    {
      "name": "H.O Back"
    },
    {
      "name": "S Bharat"
    },
    {
      "name": "W.M Bonivento"
    },
    {
      "name": "M Boulay"
    },
    {
      "name": "M Caboni"
    },
    {
      "name": "N Canci"
    },
    {
      "name": "N Cargioli"
    },
    {
      "name": "P Castello"
    },
    {
      "name": "S Cebrián"
    },
    {
      "name": "L Consiglio"
    },
    {
      "name": "R Crampton"
    },
    {
      "name": "D. Diaz Mairena"
    },
    {
      "name": "D Franco"
    },
    {
      "name": "I Fuente-Ortega"
    },
    {
      "name": "F Gabriele"
    },
    {
      "name": "D Gahan"
    },
    {
      "name": "C Galbiati"
    },
    {
      "name": "P. Garcia Abia"
    },
    {
      "name": "T Hessel"
    },
    {
      "name": "S Horikawa"
    },
    {
      "name": "A Ianni"
    },
    {
      "name": "G Korga"
    },
    {
      "name": "M Kuźniak"
    },
    {
      "name": "L Luzzi"
    },
    {
      "name": "A Marasciulli"
    },
    {
      "name": "M Martínez"
    },
    {
      "name": "P Organtini"
    },
    {
      "name": "A. Ortiz de Solórzano"
    },
    {
      "name": "R Pavarani"
    },
    {
      "name": "P Pegoraro"
    },
    {
      "name": "V. Pesudo Fortes"
    },
    {
      "name": "M Razeti"
    },
    {
      "name": "O.U Rehman"
    },
    {
      "name": "L Romero"
    },
    {
      "name": "D Sablone"
    },
    {
      "name": "E Sánchez García"
    },
    {
      "name": "R Santorelli"
    },
    {
      "name": "C Seoane"
    },
    {
      "name": "J Sosiak"
    },
    {
      "name": "S Sulis"
    },
    {
      "name": "C Tierney"
    },
    {
      "name": "S Tullio"
    },
    {
      "name": "G Vera Díaz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/20c6c52cc0khk.bib",
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  "doi": "10.48550/arxiv.2609.39400",
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  "pdf_url": "https://arxiv.org/pdf/2609.39400",
  "pmcid": null,
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  "published": "2026-10-01",
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  "ris": "https://research.draconitic.com/paper/20c6c52cc0khk.ris",
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      "first_seen": "2026-10-30T12:17:49Z",
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      "url": "https://arxiv.org/abs/2609.39400"
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  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
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    {
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    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
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  "title": "Measurement of the $^{39}$Ar specific activity in atmospheric argon with DArT at the Canfranc Underground Laboratory",
  "title_text": "Measurement of the ^39Ar specific activity in atmospheric argon with DArT at the Canfranc Underground Laboratory",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/20c6c52cc0khk",
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