Author: Alexander KishPublisher:
ISBN:
Category :
Languages : en
Pages : 121
Book Description
Dark Matter Search with the XENON100 Experiment
Author: Alexander KishLow-mass Dark Matter Search with the XENON100 Experiment
Author: Andrea TiseniPublisher:
ISBN: 9789462338432
Category :
Languages : en
Pages : 146
Book Description
"It is hypothesized that 26% of the mass and energy content of the universe consists of Dark Matter. The most promising Dark Matter candidates are Weakly Interacting Massive Particles (WIMP). If WIMPs are the Dark Matter particles, then they could be directly de-tected via their scattering off nuclei. The XENON100 experiment aims to detect the scattering of a WIMP with a xenon nucleus. This experiment is a xenon-based dual-phase (liquid-gas) Time Projection Chamber (TPC). The interaction of a particle in the TPC produces both scintillation photons and ionization electrons, which are both detected as light signals by photomultipliers. So far, the XENON100 experiment has not observed WIMPs, and exclusion limits have been produced. The data analysis relies on an accurate description of the backgrounds. In this thesis I present an analysis that assumes potentially unknown backgrounds to be present in the data. In this way, a WIMP exclusion limit without background subtraction is calculated with a minimum WIMP-nucleon cross section of 2.05 × 10-45 cm2 at a WIMP mass of 50 GeV. Furthermore, I developed a new method to enhance the sensitivity of the XENON100 experiment towards low-mass WIMPs using solely the ionization signal to calculate the recoil energy. Using this method, the sensitivity of the XENON100 experiment is improved by several orders of magnitude for WIMP masses below 7 GeV, excluding a WIMP-nucleon cross section of 1.4 × 10-41 cm2 at a WIMP mass of 6 GeV."--Samenvatting auteur.
Search for Low Mass Dark Matter with the XENON100 Experiment and Simulations for 1 Ton and 10 Ton Dark Matter Detectors
Author: Ethan Craig BrownXENON100 Dark Matter Search
Author: Kyungeun LimPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Data from the XENON100 experiment have resulted in the most stringent limits on the spin-independent elastic WIMP- nucleon scattering cross sections for most of the significant WIMP masses. As the experimental precision increases, a better understanding of the scintillation and ionization response of LXe to low energy (
Light Detectors for the XENON100 and XENON1T Dark Matter Search Experiments
Author: Annika BehrensSearch for Dark Matter with XENON100 and Future Ton-scale Detectors
Author: Chi Wai LamGentle Neutron Signals and Noble Background in the XENON100 Dark Matter Search Experiment
Author: Marc WeberThe XENON100 Dark Matter Experiment
Author: Guillaume PlantePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This thesis describes the research conducted in the context of the XENON100 dark matter search experiment. I describe the initial simulation results and ideas that influenced the design of the XENON100 detector, the construction and assembly steps that lead into its concrete realization, the detector and its subsystems, a subset of the calibration results of the detector, and finally dark matter exclusion limits. I also describe in detail the new improved measurement of the important quantity for the interpretation of results from LXe dark matter searches, the scintillation efficiency of low-energy nuclear recoils in LXe.
The Search for Dark Matter in XENON100 Using a Two-dimensional Profile Likelihood Analysis
Author: Kevin Joseph LungPublisher:
ISBN:
Category :
Languages : en
Pages : 169
Book Description
Direct dark matter detectors are currently probing the favored supersymmetric theoretical phase space for weakly interacting massive particles (WIMPs) as part of a larger electroweak sector particle search. The XENON100 detector has recently improved upon their world-best upper limits on WIMP-nucleon scattering cross sections from 2011 with new results presented in 2012, which have further ruled out much of the predicted regions for dark matter. In the low mass regime, the results shown so far have been conservative in addressing the claims of a WIMP detection by CoGeNT, DAMA and CRESSTII. This thesis discusses a different approach to analyzing the XENON100 data with a profile likelihood statistical method using the ionization channel to improve both energy reconstruction and energy resolution and probe the low WIMP mass region. A Monte Carlo simulation using a combination of detector geometry and underlying statistical features of signal production has been developed to determine the ionization yield, which has only a few direct measurements, and to model WIMP interactions as input to the statistical technique. The resulting profile likelihood analysis, which includes systematic uncertainties in the energy scales and background and signal models, has been able to improve the current upper limits by a factor of 10 in the low mass region (6-10 GeV/c2) and about a factor of 2 up to 50 GeV/c2. The discovery potential of the dataset is also studied, which has produced a 2.3[sigma] significance for a 7.5 GeV/c2 particle at a cross section of [sigma]_x-N =1.8 X 10−43 cm2 with a 95% confidence interval of [1.74 X 10−44,7.76 & times;10−43] cm2.
Author: Ali Askin