Measuring the Neutrino Mixing Angle Theta-13 with the Double Chooz Far Detector PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Measuring the Neutrino Mixing Angle Theta-13 with the Double Chooz Far Detector PDF full book. Access full book title Measuring the Neutrino Mixing Angle Theta-13 with the Double Chooz Far Detector by Igor Ostrovskiy. Download full books in PDF and EPUB format.
Author: Igor Ostrovskiy
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 256
Get Book Here
Book Description
The neutrino mixing angle theta-13 is the last one which value is still unknown. This dissertation presents an analysis suggesting a non-zero value of the theta-13. The analysis is based on four months of data taken with the far Double Chooz reactor anti-neutrino detector. Using only rate information yields a best fit value of sin2(2theta-13) equal to 0.0934±0.0785 (1 sigma). Incorporating information on the shape of the signal energy spectrum in the analysis results in a best fit value of 0.0849±0.0509 (1 sigma). Based on frequentist studies, sin2(2theta-13)=0 is excluded at the 92.6% confidence level. The frequentist construction using delta chi-square as an ordering rule gives [0.0098, 0.1825] interval for sin2(2theta-13) at 90% C.L.
Author: Igor Ostrovskiy
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 256
Get Book Here
Book Description
The neutrino mixing angle theta-13 is the last one which value is still unknown. This dissertation presents an analysis suggesting a non-zero value of the theta-13. The analysis is based on four months of data taken with the far Double Chooz reactor anti-neutrino detector. Using only rate information yields a best fit value of sin2(2theta-13) equal to 0.0934±0.0785 (1 sigma). Incorporating information on the shape of the signal energy spectrum in the analysis results in a best fit value of 0.0849±0.0509 (1 sigma). Based on frequentist studies, sin2(2theta-13)=0 is excluded at the 92.6% confidence level. The frequentist construction using delta chi-square as an ordering rule gives [0.0098, 0.1825] interval for sin2(2theta-13) at 90% C.L.
Author: Brandon Reed White
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
Get Book Here
Book Description
The measurement of the remaining neutrino-mixing angle, [theta]13, is a critical step toward further understanding of neutrino properties and to guide future neutrino oscillation experiments. Double Chooz has a unique opportunity to perform this measurement building on the original CHOOZ reactor anti-neutrino experiment, the experience that set the previous limits on [theta]13. In the first phase of Double Chooz, 101 days of data was analyzed with only the far detector operating of a two-detector plan. In this thesis I will describe the design of the low background neutrino detector and the oscillation analysis performed. From the deficiency between the expected and measured number of electron anti-neutrinos a value of sin2(2[theta]13) = 0.104 ± 0.03(stat) ± 0.076(syst) was found for rate only analysis and 0.086 ± 0.041(stat) ± 0.030(syst) with the rate and spectral energy shape analysis.
![Estimating the Neutron Background Toward the Measurement of Neutrino Mixing Angle [theta]13 with the Double Chooz Detector PDF](https://books.google.com/books/content/images/frontcover/TCcQnQAACAAJ?fife=w80-h100)
Author: Deepak Shrestha
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Double Chooz is a reactor neutrino experiment which has shown evidence of electron anti-neutrino disappearance at 1 km distance. It has been able to exclude the no-oscillation hypothesis at 99.8% CL (2.9[sigma]) with only one detector. From a rate plus spectral shape analysis, the value of sin22[theta]13 was found to be 0.109 ± 0.030(stat) ± 0.025(syst). Correlated events mimicking an anti-neutrino event are one of the most important backgrounds for a reactor neutrino experiment like Double Chooz which measured the neutrino mixing angle [theta]13. Cosmic muons passing through the rock surrounding the detector produce fast neutrons which give rise to correlated events through proton recoil followed by a neutron capture. Muons stopping around the chimney region subsequently decay into Michel electrons also contributing to the correlated background. Measurement of the shape and rate of this background is very important for the precise measurement of [theta]13. Experimental techniques to estimate of the shape and rate of this background in the Double Chooz far detector are presented in this thesis.
Author: David Anselm Stüken
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
![Independent Measurement of the Neutrino Mixing Angle [theta]13 Via Neutron Capture on Hydrogen at Daya Bay PDF](https://books.google.com/books/content/images/frontcover/eS2iAQAACAAJ?fife=w80-h100)
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
A new measurement of the [theta]13 mixing angle has been obtained at the Daya Bay Reactor Neutrino Experiment via the detection of inverse beta decays tagged by neutron capture on hydrogen. The antineutrino events for hydrogen capture are distinct from those for gadolinium capture with largely different systematic uncertainties, allowing a determination independent of the gadolinium-capture result and an improvement on the precision of the [theta]13 measurement. With a 217-day antineutrino data set obtained with six antineutrino detectors and from six 2.9 GWth reactors, the rate deficit observed at the far hall is interpreted as sin22[theta]13=0.083"0.018 in the three-flavor oscillation model. When combined with the gadolinium-capture result from Daya Bay, we obtain sin22[theta]13=0.089"0.008 as the final result for the six-antineutrino-detector configuration of the Daya Bay experiment.
Author: José Ignacio Crespo Anadón
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Diana Navas Nicolás
Publisher:
ISBN:
Category :
Languages : en
Pages : 218
Get Book Here
Book Description
Neutrinos are the most abundant massive particles in our Universe but its existence was only predicted 90 years ago. In fact they were not experimentally observed until 60 years ago due to their extraordinarily low cross-section and even nowadays many questions concerning these subatomic particles remain open, as their mass magnitude and ordering, their Dirac or Majorana nature or the possibility of CP-violation.The Standard Model of Particle Physics establishes that neutrinos are massless particles. Nevertheless in 2015, Takaaki Kajita and Arthur McDonald were awarded with the Nobel prize in Physics for the discovery of the phenomenon of neutrino flavour oscillations, only possible if neutrinos are massive, demonstrating that a neutrino of one particular flavour has non-zero probability to be detected with a different flavour. These oscillations are governed by six independent parameters: 3 mixing angles 12, 23 and 13, two mass squared differences and a CP phase responsible for the CP-violation in the leptonic sector, being this last parameter still unknown as well as the neutrino mass ordering...
![Estimation of the Systematic Uncertainties of the Measurement of the Neutrino Mixing Angle Θ13 [Theta] Related to the Trigger System of the Double Chooz Experiment PDF](https://books.google.com/books/content/images/frontcover/dz_FzQEACAAJ?fife=w80-h100)
Author: David Anselm Stüken
Publisher:
ISBN:
Category :
Languages : en
Pages : 153
Get Book Here
Book Description
Author: Justin Roy Dhooghe
Publisher:
ISBN: 9780355969054
Category :
Languages : en
Pages :
Get Book Here
Book Description
This dissertation provides a complimentary analysis to the official Double Chooz experiment measuring the neutrino mixing angle between the first and third mass eigenstates. Double Chooz is a liquid scintillator experiment consisting of two 8.3 ton cylindrical detectors located approximately 1km and 400m away from two 4.25 GW nuclear reactors in Chooz, France. Using 467 live days of data from the far detector along with 9 months of additional data from the upgraded far detector and the newly commissioned near detector, a best-fit value of sin2(2[theta]13) = 0.1086 ± 0.0112 is obtained. Presented in this analysis is the comparison of theoretical prediction and collected data using new experimentally determined U238 flux measurements, the testing of 8 additional isotopes as an explanation for the [4, 6] MeV event excess and the use of an alternative statistical frameworkusing Bayesian statistics. This work concludes with a discussion of the results’ relation to other [theta]13 experiments and possible insights into the discrepancies.
![New Measurement of [theta]13 Via Neutron Capture on Hydrogen at Daya Bay PDF](https://books.google.com/books/content/images/frontcover/AOoRuAEACAAJ?fife=w80-h100)
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
This article reports an improved independent measurement of neutrino mixing angle [theta]13 at the Daya Bay Reactor Neutrino Experiment. Electron antineutrinos were identified by inverse [beta]-decays with the emitted neutron captured by hydrogen, yielding a data set with principally distinct uncertainties from that with neutrons captured by gadolinium. With the final two of eight antineutrino detectors installed, this study used 621 days of data including the previously reported 217-day data set with six detectors. The dominant statistical uncertainty was reduced by 49%. Intensive studies of the cosmogenic muon-induced 9Li and fast neutron backgrounds and the neutron-capture energy selection efficiency, resulted in a reduction of the systematic uncertainty by 26%. The deficit in the detected number of antineutrinos at the far detectors relative to the expected number based on the near detectors yielded sin22[theta]13 = 0.071 ± 0.011 in the three-neutrino-oscillation framework. As a result, the combination of this result with the gadolinium-capture result is also reported.
