The Cryogenic Dark Matter Search and Background Rejection with Event Position Information

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 2005

DOI:https://doi.org/10.2172/15017231· OSTI ID:15017231

Wang, Gensheng ^[1]

---

1. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Physics

Evidence from observational cosmology and astrophysics indicates that about one third of the universe is matter, but that the known baryonic matter only contributes to the universe at 4%. A large fraction of the universe is cold and non-baryonic matter, which has important role in the universe structure formation and its evolution. The leading candidate for the non-baryonic dark matter is Weakly Interacting Massive Particles (WIMPs), which naturally occurs in the supersymmetry theory in particle physics. The Cryogenic Dark Matter Search (CDMS) experiment is searching for evidence of a WIMP interaction off an atomic nucleus in crystals of Ge and Si by measuring simultaneously the phonon energy and ionization energy of the interaction in the CDMS detectors. The WIMP interaction energy is from a few keV to tens of keV with a rate less than 0.1 events/kg/day. To reach the goal of WIMP detection, the CDMS experiment has been conducted in the Soudan mine with an active muon veto and multistage passive background shields. The CDMS detectors have a low energy threshold and background rejection capabilities based on ionization yield. However, betas from contamination and other radioactive sources produce surface interactions, which have low ionization yield, comparable to that of bulk nuclear interactions. The low-ionization surface electron recoils must be removed in the WIMP search data analysis. An emphasis of this thesis is on developing the method of the surface-interaction rejection using location information of the interactions, phonon energy distributions and phonon timing parameters. The result of the CDMS Soudan run118 92.3 live day WIMP search data analysis is presented, and represents the most sensitive search yet performed.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 15017231
• Report Number(s): FERMILAB-THESIS--2005-09
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASTROPHYSICS
Astrophysics
CONTAMINATION
COSMOLOGY
CRYOGENICS
DATA ANALYSIS
DETECTION
ELECTRONS
ENERGY SPECTRA
Experiment-HEP
IONIZATION
MUONS
NONLUMINOUS MATTER
PHONONS
PHYSICS
SHIELDS
SUPERSYMMETRY
UNIVERSE