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Influence of NaI background and mass on testing the DAMA modulation

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arxiv 2107.07674 v2 pith:V6I7IJB3 submitted 2021-07-16 hep-ex astro-ph.IMphysics.ins-det

Influence of NaI background and mass on testing the DAMA modulation

classification hep-ex astro-ph.IMphysics.ins-det
keywords backgrounddamalimitsanaisconfidencecosinedetectorsexclusion
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present here the model dependent and independent sensitivity studies for NaI detectors designed to test the DAMA result, and compare the predicted limits from SABRE with the present performance of both ANAIS and COSINE. We find that the strongest discovery and exclusion limits are set by a detector with the lowest background (assuming equal run times), and also note that our method correctly computes the present exclusion limits previously published by ANAIS and COSINE. In particular, with a target mass of 50 kg and background rate of 0.36 cpd/kg/keV (after veto), SABRE will be able to exclude the DAMA signal with 3$\sigma$ confidence or `discover' it with 5$\sigma$ confidence within 2 years. This strongly motivates the quest for ever lower backgrounds in NaI detectors.

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