Abstract/Details

Background Characterization and Discrimination in the Final Analysis of the CDMS II Phase of the Cryogenic Dark Matter Search


2011 2011

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Abstract (summary)

The Cryogenic Dark Matter Search (CDMS) is designed to detect Weakly-Interacting Massive Particles (WIMPs) in the Milky Way halo. The phase known as CDMS II was performed in the Soudan Underground Laboratory. The final set of CDMS II data, collected in 2007-8 and referred to as Runs 125–8, represents the largest exposure to date for the experiment.

We seek collisions between WIMPs and atomic nuclei in disk-shaped germanium and silicon detectors. A key design feature is to keep the rate of collisions from known particles producing WIMP-like signals very small. The largest category of such background is interactions with electrons in the detectors that occur very close to one of the faces of the detector. The next largest category is collisions between energetic neutrons that bypass the experimental shielding and nuclei in the detectors. Analytical efforts to discriminate these backgrounds and to estimate the rate at which such discrimination fails have been refined and improved throughout each phase of CDMS.

Next-generation detectors for future phases of CDMS require testing at cryogenic test facilities. One such facility was developed at the University of Minnesota in 2007 and has been used continuously since then to test detectors for the next phase of the experiment, known as SuperCDMS.

Indexing (details)


Subject
Astrophysics;
Particle physics
Classification
0596: Astrophysics
0798: Particle physics
Identifier / keyword
Pure sciences; CDMS; Collisions; Dark matter; Elementary particles; Underground; Wimp
Title
Background Characterization and Discrimination in the Final Analysis of the CDMS II Phase of the Cryogenic Dark Matter Search
Author
Fritts, Matthew Christopher
Number of pages
170
Publication year
2011
Degree date
2011
School code
0130
Source
DAI-B 72/06, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124549774
Advisor
Cushman, Priscilla B.
Committee member
Cronin-Hennessy, Daniel P.; Mans, Jeremiah; Williams, Liliya L.R.
University/institution
University of Minnesota
Department
Physics
University location
United States -- Minnesota
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3445409
ProQuest document ID
861323408
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/861323408
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