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Measurement of the specific activity of Ar-39 in natural argon

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arxiv astro-ph/0603131 v2 pith:TM2VIH7J submitted 2006-03-06 astro-ph

P. Benetti , F. Calaprice , E. Calligarich , M. Cambiaghi , F. Carbonara , F. Cavanna , A.G. Cocco , F. Di Pompeo
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N. Ferrari G. Fiorillo C. Galbiati L. Grandi G. Mangano C. Montanari L. Pandola A. Rappoldi G.L. Raselli M. Roncadelli M. Rossella C. Rubbia R. Santorelli A.M. Szelc C. Vignoli Y. Zhao
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We report on the measurement of the specific activity of Ar-39 in natural argon. The measurement was performed with a 2.3-liter two-phase (liquid and gas) argon drift chamber. The detector was developed by the WARP Collaboration as a prototype detector for WIMP Dark Matter searches with argon as a target. The detector was operated for more than two years at Laboratori Nazionali del Gran Sasso, Italy, at a depth of 3,400 m w.e. The specific activity measured for Ar-39 is 1.01 +/- 0.02(stat) +/- 0.08(syst) Bq per kg of natural Ar.

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