Download or read book Search for Neutrinoless Double Beta Decay in 136Xe with EXO 200 written by and published by . This book was released on 2015 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Background Studies and Search for Neutrinoless Double Beta Decay in 136Xe with the EXO 200 Detector written by Manuel Weber and published by . This book was released on 2012 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Search for Zero Neutrino Double Beta Decay in 136 Xe with EXO 200 written by Kevin Patrick O'Sullivan and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This analysis reports a search for the neutrinoless double decay (0[nu][beta][beta]) of 136-Xe with the EXO-200 detector. 0[nu][beta][beta] is a hypothetical nuclear process which only occurs if neutrinos are so called Majorana particles, which are there own anti-particles, as opposed to Dirac particles which have separate anti-particles. The search for 0[nu][beta][beta] is currently the most experimentally viable technique to address the Dirac or Majorana nature of neutrinos. The EXO-200 experiment is a liquid xenon time projection cham- ber operating 655 meters underground at the Waste Isolation Pilot Plant (WIPP) with 200 kg of xenon enriched to 80.6% in the isotope 136-Xe. A total of one event in the one sigma region of interest is observed with background of (1.5 ± .1) × 10^-3 counts/keV/kg/yr. This places a limit on the 0[nu][beta][beta] half-life of 136Xe is of 1.59×10^25.
Download or read book Search for Neutrinoless Double Beta Decay in u0088 Xe with EXO 200 written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Neutrinoless Double beta Decay and 42Ar in Enriched Xenon Using the EXO 200 Dataset written by Mitchell Hughes and published by . This book was released on 2020 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observation of neutrinoless double-beta decay (0ÎưÎøÎø) would constitute discovery of a new class of particle (the Majorana neutrino), violate lepton number conservation, and provide a constraint on the neutrino mass scale. The Enriched Xenon Observatory experiment (EXO-200) operated an extremely radio-pure tracking calorimeter filled with liquid xenon enriched in the candidate isotope 136Xe and installed underground in New Mexico, USA. The author presents a search for 0ÎưÎøÎø with the complete EXO-200 dataset, the second-largest exposure of any 0ÎưÎøÎø experiment (234.1 kg8́9yr). The analysis applied coupled fits to event energy and position with a classical topological discriminator. The author produced an expanded background model to search for radioactive 42Ar via its Îø-decay product, 42K. No signal excess was observed near the 0ÎưÎøÎø Q-value, leading to a limit on the 0ÎưÎøÎø half-life in 136Xe of T_(1/2)^0Îư >3.0©710^25 yr and Majorana neutrino mass 0̂8m_ÎøÎø 0̂9
Download or read book Observation of Two Neutrino Double Beta Decay in Xe 136 with EXO 200 written by and published by . This book was released on 2012 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the observation of two-neutrino double-beta decay in 136Xe with T12 = 2.11 ± 0.04(stat) ± 0.21(syst) x 1021 yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for 136Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrinoless double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.
Download or read book Search for Neutrinoless Double Beta Decay of 136Xe with the EXO Experiment written by Guillaume Giroux and published by . This book was released on 2012 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Neutrinoless Double Beta Decay with EXO 200 and NEXO written by Michael Joseph Jewell and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutrinoless Double Beta Decay is a theorized nuclear decay in which a nucleus decays via the emission of two electrons but no neutrinos. Detection of this lepton number violating process represents the best test of the Majorana nature of neutrinos, which could potentially provide an elegant mechanism by which neutrinos obtain mass. Both the recently decommissioned EXO-200 and the future experiment nEXO search for this hypothesized decay using liquid xenon time projection chambers filled with xenon enriched in the isotope Xe136. In the first part of this work, the results from the final neutrinoless double beta decay search of EXO-200 with the complete dataset is presented. This includes a description of the advanced analysis techniques used to maximize the topological discrimination between double beta signal and gamma backgrounds. The second part of this work presents the current state of R\& D efforts towards designing the planned tonne scale experiment, with focus on the characterization of charge-detecting tiles which are proposed to make up the anode plane of nEXO.
Download or read book A Search for Double Beta Decay of Xenon to Excited States of Barium with EXO 200 written by Sereres Johnston and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents searches for several modes of double beta decays of 136Xe to two low-lying excited levels of 136Ba. For each final level, both 2[nu] and 0[nu] double beta decay processes are considered. The data and general techniques developed by the EXO-200 collaboration are used, including a Machine Learning process to improve sensitivity in multivariate space. EXO-200 is an experimental program searching for 0[nu][beta][beta] decay in a time projection chamber filled with 175 kg of liquid Xenon enriched to 80% 136Xe, functioning as both source and detector. Experimental searches of double beta decay with 136Xe and other isotopes are motivated by non Standard Model neutrinoless decay (0[nu][beta][beta]) possibilities. If found this would imply the Majorana nature of neutrinos, provide access to the currently unknown absolute mass scale of the neutrino, and violate lepton conservation by 2 units. Nuclear matrix elements necessary to connecting observed neutrinoless halflife to the neutrino mass scale depend on nuclear models. Observation of both the 2[nu] 0+ excited and 0+ ground state in a single element may constrain these models. Sensitivity studies of search performance are described, and final sensitivities from 7.86 · 10^23 years to 2.00 · 10^25 years are reported.
Download or read book Searching for Double Beta Decay with the Enriched Xenon Observatory written by and published by . This book was released on 2007 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Enriched Xenon Observatory (EXO) Collaboration is building a series of experiments to search for the neutrinoless double beta decay of 136Xe. The first experiment, known as EXO-200, will utilize 200 kg of xenon enriched to 80% in the isotope of interest, making it the largest double beta decay experiment to date by one order of magnitude. This experiment is rapidly being constructed, and will begin data taking in 2007. The EXO collaboration is also developing a technique to identify on an event-by-event basis the daughter barium ion of the double beta decay. If successful, this method would eliminate all conventional radioactive backgrounds to the decay, resulting in an ideal experiment. We summarize here the current status of EXO-200 construction and the barium tag R & D program.
Download or read book Status of EXO 200 written by and published by . This book was released on 2011 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: EXO-200 is the first phase of the Enriched Xenon Observatory (EXO) experiment, which searches for neutrinoless double beta decay in 136Xe to measure the mass and probe the Majorana nature of the neutrino. EXO-200 consists of 200 kg of liquid Xe enriched to 80% in 136Xe in an ultra-low background TPC. Energy resolution is enhanced through the simultaneous collection of scintillation light using Large Area Avalanche Photodiodes (LAAPD's) and ionization charge. It is being installed at the WIPP site in New Mexico, which provides a 2000 meter water-equivalent overburden. EXO-200 will begin taking data in 2009, with the expected two-year sensitivity to the half-life for neutrinoless double beta decay of 6.4 x 1025 years. According to the most recent nuclear matrix element calculations, this corresponds to an effective Majorana neutrino mass of 0.13 to 0.19 eV. It will also measure the two neutrino mode for the first time in 136Xe.
Download or read book Discovery of the Two neutrino Double beta Decay of Xenon 136 with EXO 200 written by Russell Geoffrey Neilson and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent neutrino oscillation measurements provide definitive evidence for non-zero neutrino masses. Oscillation measurements, however, only measure mass differences, not the absolute mass scale. Neutrinoless double-beta decay, a hypothetical nuclear transition, can probe the absolute neutrino mass scale. This process, if observed, would also imply that neutrinos are their own anti-particles and that lepton number is not a conserved quantity. The 200 kg Enriched Xenon Observatory (EXO-200) detector is currently taking data to search for the neutrinoless double-beta decay of Xe-136, with an expected half-life in excess of 10^25 years. Located at the Waste Isolation Pilot Plant (WIPP) near Carlsbad, New Mexico, the detector is filled with 200 kg of isotopically enriched liquid xenon. The analysis presented here describes the recent observation with EXO-200 of the two-neutrino double beta-decay of Xe-136. This is the rarest process ever directly observed with a half-life of 2.11+-0.21 x 10^21 years and provides important input to the measurement of the neutrinoless decay.
Download or read book Application of Deep Learning Methods to the Search for Neutrinoless Double Beta Decay with the EXO 200 Experiment written by Tobias Ziegler and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Double Beta Decay in Xenon 136 Measuring the Neutrino Emitting Mode and Searching for Majoron Emitting Modes written by and published by . This book was released on 2013 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observations of neutrino flavor oscillations have demonstrated that neutrinos have mass. Since the discovery of these oscillations, much progress has been made at mea- suring the neutrino mass-squared differences and lepton mixing angles that character- ize them. However, the origin and absolute scale of neutrino masses remain unknown. Unique among fermions, neutrinos can be Majorana particles, which could provide an explanation for neutrino masses. Discovery of a hypothetical process known as neutrinoless double beta decay would show that neutrinos are Majorana particles and determine the mass scale for neutrinos. The Enriched Xenon Observatory (EXO) is a series of experiments searching for the neutrinoless double beta decay of 136Xe. The first experiment, EXO-200, began operation in 2011 and makes use of 200 kg of xenon enriched to 80.6% in 136Xe. The analysis presented here makes use of data from EXO-200 to obtain a more precise measurement of the half-life for the two-neutrino-emitting mode of double beta decay than previously reported. The analysis also sets limits on the half-lives for exotic, Majoron-emitting modes of neutrinoless double beta decay. Data from EXO-200 is also used to produce a measurement of the cosmic muon flux at the WIPP under- ground site where EXO-200 is located.
Download or read book Neutrinos in High Energy and Astroparticle Physics written by Jose Wagner Furtado Valle and published by John Wiley & Sons. This book was released on 2015-04-20 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This self-contained modern textbook provides a modern description of the Standard Model and its main extensions from the perspective of neutrino physics. In particular it includes a thorough discussion of the varieties of seesaw mechanism, with or without supersymmetry. It also discusses schemes where neutrino mass arises from lighter messengers, which might lie within reach of the world's largest particle accelerator, the Large Hadron Collider. Throughout the text, the book stresses the role of neutrinos due to the fact that neutrino properties may serve as a guide to the correct model of unification, hence for a deeper understanding of high energy physics, and because neutrinos play an important role in astroparticle physics and cosmology. Each chapter includes summaries and set of problems, as well as further reading.
Download or read book First Search for Lorentz and CPT Violation in Double Beta Decay with EXO 200 written by and published by . This book was released on 2016 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring Nothing Repeatedly written by Allan Franklin and published by Morgan & Claypool Publishers. This book was released on 2019-12-10 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been many recent discussions of the 'replication crisis' in psychology and other social sciences. This has been attributed, in part, to the fact that researchers hesitate to submit null results and journals fail to publish such results. In this book Allan Franklin and Ronald Laymon analyze what constitutes a null result and present evidence, covering a 400-year history, that null results play significant roles in physics.
