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Phys Rev Lett. 2014 Jan 31;112(4):041302. Epub 2014 Jan 27.

Search for low-mass weakly interacting massive particles using voltage-assisted calorimetric ionization detection in the SuperCDMS experiment.

Author information

1
Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
2
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
3
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
4
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA and Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
5
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
6
Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
7
Department of Physics, Stanford University, Stanford, California 94305, USA.
8
Department of Physics, University of California, Santa Barbara, California 93106, USA.
9
Departamento de Física Teórica and Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
10
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
11
Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA.
12
Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
13
Department of Physics, Queen's University, Kingston Ontario, Canada K7L 3N6.
14
Department of Physics, University of California, Berkeley, California 94720, USA.
15
Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
16
Department of Physics, Texas A&M University, College Station, Texas 77843, USA.
17
Department of Physics, University of Colorado Denver, Denver, Colorado 80217, USA.
18
Department of Physics, University of Evansville, Evansville, Indiana 47722, USA.
19
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Department of Physics, University of California, Berkeley, California 94720, USA.
20
Department of Physics, University of South Dakota, Vermillion, South Dakota 57069, USA.
21
Department of Physics, Santa Clara University, Santa Clara, California 95053, USA.

Abstract

SuperCDMS is an experiment designed to directly detect weakly interacting massive particles (WIMPs), a favored candidate for dark matter ubiquitous in the Universe. In this Letter, we present WIMP-search results using a calorimetric technique we call CDMSlite, which relies on voltage-assisted Luke-Neganov amplification of the ionization energy deposited by particle interactions. The data were collected with a single 0.6 kg germanium detector running for ten live days at the Soudan Underground Laboratory. A low energy threshold of 170  eVee (electron equivalent) was obtained, which allows us to constrain new WIMP-nucleon spin-independent parameter space for WIMP masses below 6  GeV/c2.

PMID:
24580434
DOI:
10.1103/PhysRevLett.112.041302
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