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 The Majorana Demonstrator A Search for Neutrinoless Double beta Decay of 76Ge written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The MAJORANA DEMONSTRATOR Search for Neutrinoless Double Beta Decay 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 Status of the MAJORANA DEMONSTRATOR written by and published by . This book was released on 2015 with total page 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 The Majorana Demonstrator written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutrinoless Double Beta Decay and the MAJORANA DEMONSTRATOR 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 The MAJORANA DEMONSTRATOR written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutrino less double-beta (Ov beta beta) decay is a hypothesized process where in some even-even nuclei it might be possible for two neutrons to simultaneously decay into two protons and two electrons without emitting neutrinos. This is possible only if neutrinos are Majorana particles, i.e. fermions that are their own antiparticles. Neutrinos being Majorana particles would explicitly violate lepton number conservation, and might play a role in the matter-antimatter asymmetry in the universe. The observation of neutrinoless double-beta decay would also provide complementary information related to neutrino masses. The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, with a total of 40-kg Germanium detectors, to search for the Ov beta beta decay of Ge-76 and to demonstrate a background rate at or below 3 counts/ (ROI.t.y) in the 4 keV region of interest (ROT) around the 2039 keV Q-value for Ge-76 Ov beta beta decay. In this paper, we discuss the physics of neutrinoless double beta decay and then focus on the MAJORANA DEMONSTRATOR, including its design and approach to achieve ultra-low backgrounds and the status of the experiment.
Download or read book The Search for Double Beta Decay in 76Ge written by Harry S. Miley and published by . This book was released on 1987 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Majorana Demonstrator for Neutrinoless Double Beta Decay Current Status and Future Plans written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book First Measurement of Neutrino and Antineutrino Oscillation at T2K written by Kirsty Elizabeth Duffy and published by Springer. This book was released on 2017-09-13 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports the measurement of muon neutrino and antineutrino disappearance and electron neutrino and antineutrino appearance in a muon neutrino and antineutrino beam using the T2K experiment. It describes a result in neutrino physics that is a pioneering indication of charge-parity (CP) violation in neutrino oscillation; the first to be obtained from a single experiment. Neutrinos are some of the most abundant—but elusive—particles in the universe, and may provide a promising place to look for a potential solution to the puzzle of matter/antimatter imbalance in the observable universe. It has been firmly established that neutrinos can change flavour (or ‘oscillate’), as recognised by the 2015 Nobel Prize. The theory of neutrino oscillation allows for neutrinos and antineutrinos to oscillate differently (CP violation), and may provide insights into why our universe is matter-dominated. Bayesian statistical methods, including the Markov Chain Monte Carlo fitting technique, are used to simultaneously optimise several hundred systematic parameters describing detector, beam, and neutrino interaction uncertainties as well as the six oscillation parameters.
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 A Search for Double Beta Decay in superscript 76 Ge written by Peter H. Fisher and published by . This book was released on 1988 with total page 208 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 Double Beta Decay written by and published by . This book was released on 2011 with total page 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 The Majorana Demonstrator written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
