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 Search for 2 nu beta beta Decay of Xe to the 0 1 Excited State of Ba with EXO 200 written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Excited States of Xenon 130 Populated by Beta Decay written by Theodore E. Fessler and published by . This book was released on 1969 with total page 24 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 Double Beta decay written by Rolf G. Winter and published by . This book was released on 1951 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Search for Double beta Eecay to Excited States in 76Ge Using the MAJORANA DEMONSTRATOR written by Ian Guinn and published by . This book was released on 2019 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of neutrino mass is the first tangible contradiction of the Standard Model of particle physics. Two neutrino double-beta decay (2v[BetaBeta]) is an allowed second order process in the Standard Model that has been observed with half-lives in the range of 1018 - 1024 y. Because it involves two neutrino vertices, double-beta decay is a useful tool for studying the properties of neutrinos. In particular, the discovery of neutrinoless double-beta decay (0v[BetaBeta]) would indicate that the neutrino is granted mass by the Majorana mechanism, and provide a means of measuring the mass scale of the neutrino. This would also provide a means for violating Lepton number conservation in the Standard Model, potentially enabling a mechanism for the asymmetric creation of more matter than anti-matter in the universe. 0v[BetaBeta] has never been observed and is the active subject of a variety of experiments, with best half-life limits in the range of 1025 - 1026 y. In addition, parent nuclei can double-beta decay into excited states of the daughter nucleus. Observing double-beta decay to excited states ([BetaBeta] E.S.) is helpful in understanding the nuclear matrix elements that are required for interpretting a 0v[BetaBeta] result. The branching ratios to different daughter nuclear states may also provide sensitivity to additional physics beyond the Standard Model; for example, the 2v[BetaBeta] to 2+ daughter states could indicate violation of the Pauli Exclusion Principle, and measurement of 0v[BetaBeta] to excited states would probe the exchange mechanism underlying 0v[BetaBeta]. The MAJORANA DEMONSTRATOR is measuring double-beta decay in 76Ge using an array of P-type Point Contact (PPC) High Purity Germanium (HPGe) detectors. The experiment contains 35 detectors totalling 29.8 kg of detector mass that are enriched to 88% in 76Ge so that the detectors act as both source and detector for [BetaBeta]-decay; there are an additional 23 detectors totalling 14.4 kg of detector mass with the natural isotopic abundance. The experiment is constructed using ultra-low background materials, in a clean environment located 4850' underground at the Sanford Underground Research Facility in Lead, SD. Thanks to the granularity of the detector array and the PPC dector geometry, the DEMONSTRATOR is capable of distinguishing single- and multi-site events. The PPC detectors also have the best energy resolution of any current generation experiment, at 2.5 keV in the 2039 keV region of interest for 0v[BetaBeta]. These properties have enabled the experiment to measure one of the lowest background rates of currently running experiments. The experiment is also engaged in searching for [BetaBeta] E.S.. Excited state events are inherently multi-site due to the prompt emission of a [gamma]-ray; by searching through events that hit multiple detectors, the DEMONSTRATOR is capable of performing a sensitive, low background search for these events. This dissertation will begin by presenting the theoretical motivations for both the searches for 0v[BetaBeta] and [BetaBeta]-decay to excited states. Next, it will describe the MAJORANA DEMONSTRATOR, with a focus on the elements of the experiment most relevant to the search for [BetaBeta] E.S.. The DEMONSTRATOR's simulation framework will be described, along with the simulations necessary to the search for [BetaBeta] E.S.. The techniques used to perform an optimal search for [BetaBeta] E.S., and the estimation of the detection efficiency and its uncertainty will then be described. A world-leading result using 22 kg-y of exposure will be presented. Finally, this result will be placed in the context of previous results and current theory, and opportunities to improve on the result will be discussed.
Download or read book Search for Double beta Decay of 136Xe to Excited States of 136Ba with the KamLAND Zen Experiment written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Excited States of Barium 136 and Barium 134 written by Glenn M. Julian and published by . This book was released on 1968 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Double beta decay of 76 Ge to the Excited State of 76 Se written by and published by . This book was released on 1992 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Two neutrino Double Beta Decay Excited State Transitions and HPGe Characterization for Surface Events in GERDA Phase II written by Björn Lehnert and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Double Beta Decay of 100MO and 150ND to Excited Final States written by Michael Jay Hornish and published by . This book was released on 2002 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Xenon Record of Double Beta decay and Element Synthesis written by Jauh-Tzuoh Lee and published by . This book was released on 1995 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Neutrinoless Double Beta Decay of Te 130 written by Adam Douglas Bryant and published by . This book was released on 2010 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
