First dark matter search results from a 4-kg CF3I bubble chamber operated in a deep underground site

被引：234

作者：

Behnke, E. ^{[1
]}

Behnke, J. ^{[1
]}

Brice, S. J. ^{[2
]}

Broemmelsiek, D. ^{[2
]}

Collar, J. I. ^{[3
,4
]}

Conner, A. ^{[1
]}

Cooper, P. S. ^{[2
]}

Crisler, M. ^{[2
]}

Dahl, C. E. ^{[3
,4
]}

Fustin, D. ^{[3
,4
]}

Grace, E. ^{[1
]}

Hall, J. ^{[2
]}

Hu, M. ^{[2
]}

Levine, I. ^{[1
]}

Lippincott, W. H. ^{[2
]}

Moan, T. ^{[1
]}

Nania, T. ^{[1
]}

Ramberg, E. ^{[2
]}

Robinson, A. E. ^{[3
,4
]}

Sonnenschein, A. ^{[2
]}

Szydagis, M. ^{[3
,4
]}

Vazquez-Jauregui, E. ^{[5
]}

机构：

[1] Indiana Univ, South Bend, IN 46634 USA

[2] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[3] Univ Chicago, Enrico Fermi Inst, KICP, Chicago, IL 60637 USA

[4] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[5] SNOLAB, Lively, ON P3Y 1N2, Canada

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 05期

基金：

美国国家科学基金会; 美国能源部;

关键词：

CODE; CANDIDATES; LIMITS;

D O I：

10.1103/PhysRevD.86.052001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

New data are reported from the operation of a 4.0-kg CF3I 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. The remaining excess of single bubble events exhibits characteristics indicating the presence of an additional background. These data provide new direct detection constraints on WIMP-proton spin-dependent scattering for WIMP masses >20 GeV/c(2) and demonstrate significant sensitivity for spin-independent interactions.

引用

页数：9

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