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      First dark matter search results from a 4-kg CF\(_3\)I bubble chamber operated in a deep underground site

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          Abstract

          New data are reported from the operation of a 4.0 kg CF\(_{3}\)I bubble chamber in the 6800-foot-deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha-decay background events from single nuclear recoils has been confirmed, with a lower bound of \(>\)99.3% rejection of alpha-decay events. Twenty single nuclear recoil event candidates and three multiple bubble events were observed during a total exposure of 553 kg-days distributed over three different bubble nucleation thresholds. The effective exposure for single bubble recoil-like events was 437.4 kg-days. A neutron background internal to the apparatus, of known origin, is estimated to account for five single nuclear recoil events and is consistent with the observed rate of multiple bubble events. This observation provides world best direct detection constraints on WIMP-proton spin-dependent scattering for WIMP masses \(>\)20 GeV/c\(^{2}\) and demonstrates significant sensitivity for spin-independent interactions.

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            Girardet al.(for the SIMPLE Collaboration) Reply:

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              Characteristics of Bubble Chambers

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                Author and article information

                Journal
                13 April 2012
                2012-09-19
                Article
                10.1103/PhysRevD.86.052001
                1204.3094
                d26d6760-527f-4b62-a38e-c291fcd0358b

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                FERMILAB-PUB-12-098-AD-AE-CD-E-PPD
                Phys. Rev. D 86, 052001 (2012)
                9 pages, 7 figures, 2 tables
                astro-ph.CO hep-ex nucl-ex

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