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An improved measurement of the 2ν β β\ half-life of Xe-136 with EXO-200

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arxiv 1306.6106 v4 pith:PWDJYSSQ submitted 2013-06-25 nucl-ex hep-exphysics.ins-det

An improved measurement of the 2ν β β\ half-life of Xe-136 with EXO-200

classification nucl-ex hep-exphysics.ins-det
keywords betahalf-lifemeasurementexo-200xe-136decayimprovedused
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on an improved measurement of the 2\nu \beta \beta\ half-life of Xe-136 performed by EXO-200. The use of a large and homogeneous time projection chamber allows for the precise estimate of the fiducial mass used for the measurement, resulting in a small systematic uncertainty. We also discuss in detail the data analysis methods used for double-beta decay searches with EXO-200, while emphasizing those directly related to the present measurement. The Xe-136 2\nu \beta \beta\ half-life is found to be 2.165 +- 0.016 (stat) +- 0.059 (sys) x 10^21 years. This is the most precisely measured half-life of any 2\nu \beta \beta\ decay to date.

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