Download or read book The Beta Spectrum of Tritium and the Mass of the Neutrino written by Robert James Douglas Moffat and published by . This book was released on 1953 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plans for a High resolution Measurement of the Tritium Beta spectrum End Point to Determine the Neutrino Mass written by Atomic Energy of Canada Limited and published by Chalk River, Ont. : Chalk River Nuclear Laboratories. This book was released on 1983 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Problems and Progress in Tritium Beta Decay written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been nearly eight years since the group led by Lubimov first saw evidence for a finite neutrino mass in the tritium beta decay spectrum. Their measurement provided a great stimulus to the field; the number of experiments currently underway reflects the significance of their claim. The fact that further data are only now beginning to appear reflects the difficulty of this measurement. As an introduction to related papers in these proceedings, we briefly consider the key elements involved in neutrino-mass measurements using tritium beta decay and list the experiments currently underway in the field. 5 refs., 1 tab.

Download or read book Tau Neutrino Component to Tritium Beta Decay written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A framework is given for explaining anomalous results of neutrino mass experiments that measure the high energy electron spectrum of tritium[beta] decay. The experimental results have been fit to a negative neutrino mass square. We show that there is a consistent phenomenological interpretation due to a positive mass tau neutrino component of the[beta] decay spectrum, with strong near threshold final state interactions with the He nucleus. If this enhancement is due to new interactions between low energy tau neutrinos and nuclei, then the tritium 0 decay experiments could be used as detectors for cosmic background tau neutrinos. The model predicts a distinctive spectrum shape that is consistent with a recent high statistics LLNL experiment. A fit to the experiment gives a tau neutrino mass of 23 eV. Tau neutrinos of this mass would dominate the mass of the universe. Requirements for a theoretical model are given, as well as models that realize different aspects of these requirements. While qualitatively successful, the theoretical models have such severe quantitative difficulties that the accuracy of the molecular physics of the T-[sup 3]He ion, assumed in the analysis of the experimental data, is called into question.

Download or read book Investigation of Neutrino Mass and Mixing in Tritium Beta Decay written by Moustafa Yahia Bahran and published by . This book was released on 1992 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Electron Antineutrino Mass from the Beta Spectrum of Gaseous Tritium written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement has been made of the mass of the electron antineutrino using the beta spectrum from a source of gaseous molecular tritium, and an upper limit of 36 eV/c2 has been set on this mass. This measurement is the first upper limit on neutrino mass that does not rely on assumptions about the atomic configuration after the beta decay, and it has significantly smaller systematic errors associated with it than do previous measurements. 130 refs., 83 figs., 8 tabs.

Download or read book Techniques for Direct Neutrino Mass Measurement Utilizing Tritium beta decay written by Daniel Lawrence Furse and published by . This book was released on 2015 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis documents efforts performed in the service to two direct neutrino mass experiments, namely KATRIN at the Karlsruhe Institute of Technology in Karlsruhe, Germany and Project8 at the University of Washington in Seattle. These experiments aim to utilize a measurement of the shape of the endpoint of the tritium beta decay spectrum to determine the neutrino mass, which is a technique that relies only on basic kinematics and enjoys a long and distinguished history. Additionally, these experiments utilize classical electrodynamics in their analysis of the beta electron spectrum, at KATRIN through the use of a MAC-E filter and at Project8 through magnetic confinement of electrons within a waveguide and the measurement of their weakly energy dependent relativistic cyclotron frequencies, which is an entirely new technique. In the thesis, both experiments are described in detail with particular attention paid to the components involved in energy analysis. Exploiting these experiments' similarities, an extensive simulation package called KASSIOPEIA has been prepared, which is the principal effort described herein. KASSIOPEIA is applied to both KATRIN and Project8, which in the case of KATRIN delivers valuable and detailed information regarding the performance of the electrostatic spectrometers used there, in particular the main and monitor spectrometers. In its application to Project8, KASSIOPEIA is used to determine precise electron trajectories, which can be used to simulate the signals these electrons induce in the waveguide. This thesis also includes experimental results obtained at the monitor spectrometer of the KATRIN experiment, which demonstrate the efficacy of the magnetic pulse technique at ejecting problematic stored electrons at MAc-E filters. The magnetic pulse technique relies on using a set of external aircoils surrounding a MAC-E filter to reverse and rapidly restore the magnetic field in the spectrometer symmetry plane, causing stored particle to hit the vessel walls. Owing to its success as demonstrated in this work, this technique will be employed at the main spectrometer during the upcoming data taking run at KATRIN. Finally, this thesis presents some results from the inaugural run at Project8, which showed that the theretofore undemonstrated technique, named Cyclotron Radiation Emission Spectroscopy (CRES), is capable of detecting the signal a single electron excites in a waveguide as it its magnetically trapped inside. In the history of tritium based neutrino mass experiments this technique is unique, and presents an entirely complimentary approach to that used at KATRIN. Based as it is on a frequency measurement, the technique shows great promise to mature into an extremely high precision form of electron spectroscopy, with many applications throughout nuclear physics.

Download or read book Limit on Electron Neutrino Mass from Observation of the Beta Decay of Molecular Tritium written by and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the most sensitive upper limit set on the mass of the electron antineutrino. The upper limit of 9.4 eV (95% confidence level) was obtained from a study of the shape of the beta decay spectrum of free molecular tritium. Achieving such a level of sensitivity required precise determinations of all processes that modify the shape of the observed spectrum. This result is in clear disagreement with a reported value for the mass of 26(5) eV. 30 refs., 3 figs., 2 tabs.

Download or read book Molecular Effects in the Neutrino Mass Determination from Beta decay of the Tritium Molecule written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular final state energies and transition probabilities have been computed for beta-decay of the tritium molecule. The results are of sufficient accuracy to make a determination of the electron neutrino rest mass with an error not exceeding a few tenths of an electron volt. Effects of approximate models of tritium beta-decay on the neutrino mass determination are discussed. 14 refs., 3 figs., 1 tab.

Download or read book Measurements of Neutrino Mass written by F. Ferroni and published by IOS Press. This book was released on 2009-09-29 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers a valuable insight into various aspects of the ongoing work directed at measuring neutrino mass. It took twenty years to refute the assertions of Bethe and Peierls that neutrinos were not observable, but it has since been realised that much can be learnt from these particles. The moral is, as Fiorini argues here, that the study of neutrinos was and remains demanding but rewarding. Subjects addressed in this volume include; clarifying the meaning of the Klapdor-Kleingrothaus results, probing the Majorana nature of neutrinos, observing lepton number violating effects for the first time, studying the end point of the spectrum in the search for neutrino masses and speculating whether it is possible to measure neutrino masses in cosmology. Lectures are enriched with rich historical overviews and valuable introductory material. Attention is also given to theoretical topics such as the evolution of the concept of mass in particle physics, a status report on neutrino oscillations and current discussion on neutrino masses. The reader is further reminded that neutrino masses may also have some bearing on the very origin of the matter among us, and have many deep links with other important lines of current physics research.

Download or read book Modeling Beta Decay Spectra to Analyze the Sensitivity of a Neutrino Mass Experiment written by Talia E. Weiss and published by . This book was released on 2018 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Project 8 experiment aims to measure the electron neutrino mass by obtaining and analyzing [beta] spectra from tritium decay. Using an inferential model of the experiment's anticipated data, I evaluate its projected sensitivity to certain parameters of interest. I focus on the precision and accuracy with which Project 8 can expect to resolve the [beta]-decay spectrum's endpoint in an upcoming stage of the experiment. I also present an initial prediction of Project 8's eventual expected sensitivity to the electron neutrino mass. This analysis involved generating and analyzing [beta]-decay spectral data using a model implemented in Stan, a platform for Bayesian statistical inference. The sensitivity analysis was designed to account for the anticipated distribution of results (mass and endpoint measurements) produced by the potential variation in a number of physical and experimental parameters. In addition, the method used here allows for a calibration of the consequences of inferences and decisions made in reaching those results. I find that, using one year of Project 8 Phase II data, the T2 endpoint can be resolved within a 13.7 eV window (90% C.I.) with 62% coverage (or accuracy), corresponding to a 4.1 eV posterior standard deviation. Preliminarily, using one year of Phase IV data, the electron neutrino mass can be resolved within a 0.051 eV window (90% C.I.) with 56% coverage. I also outline a way that model-based sensitivity procedures and calibration of inference can be extended to the neutrino mass hierarchy problem.

Download or read book Molecular Effects in Tritium Beta decay Neutrino mass Measurements written by Laura I. Bodine and published by . This book was released on 2015 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: An understanding of the molecular final state distribution is crucial to extracting a neutrino mass from molecular tritium-based experiments including the upcoming Karlsruhe Tritium Neutrino Mass Experiment. This dissertation studies molecular systematics for the upcoming neutrino mass measurements and discusses the measurement of molecular dissociation as a test of final state distribution calculations.

Download or read book Improved Limit on the Mass Of Nu Sub E from the Beta Decay of Molecular Tritium written by and published by . This book was released on 1990 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a new upper limit of 13.4 eV (95% confidence level) on the mass of the electron antineutrino from a study of the shape of the beta spectrum of free molecular tritium. This result appears to be inconsistent with a reported value for the mass of 26(5) eV. The electron neutrino is evidently not massive enough to close the universe by itself. 21 refs., 1 fig., 2 tabs.

Download or read book Tritium Neutrino Mass Experiments written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The current status of the experimental search for neutrino mass is reviewed, with emphasis on direct kinematic methods, such as the beta decay of tritium. The situation concerning the electron neutrino mass as measured in tritium beta decay is essentially unchanged from a year ago, although a great deal of experimental work is in progress. The ITEP group continues to find evidence for a nonzero mass, now slightly revised to 26(5) eV. After correcting for recently discovered errors in the energy loss distribution and source thickness, however, the Z/umlt u/rich group still claims and upper limit of 18 eV. There may be evidence for neutrino mass and mixing in the SN1987a data, in the same range suggested by the ITEP experiment. 42 refs., 3 figs.

Download or read book Sixty Years of Double Beta Decay written by H. V. Klapdor-Kleingrothaus and published by World Scientific. This book was released on 2001 with total page 1324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear double beta decay is one of the most promising tools for probing beyond-the-standard-model physics on beyond-accelerator energy scales. It is already now probing the TeV scale, on which new physics should manifest itself according to theoretical expectations. Only in the early 1980s was it known that double beta decay yields information on the Majorana mass of the exchanged neutrino. At present, the sharpest bound for the electron neutrino mass arises from this process. It is only in the last 10 years that the much more far-reaching potential of double beta decay has been discovered. Today, the potential of double beta decay includes a broad range of topics that are equally relevant to particle physics and astrophysics, such as masses of heavy neutrinos, of sneutrinos, as SUSY models, compositeness, leptoquarks, left-right symmetric models, and tests of Lorentz symmetry and equivalence principle in the neutrino sector. Double beta decay has become indispensable nowadays for solving the problem of the neutrino mass spectrum and the structure of the neutrino mass matrix OCo together with present and future solar and atmospheric neutrino oscillation experiments. Some future double beta experiments (like GENIUS) will be capable to be simultaneously neutrino observatories for double beta decay and low-energy solar neutrinos, and observatories for cold dark matter of ultimate sensitivity. This invaluable book outlines the development of double beta research from its beginnings until its most recent achievements, and also presents the outlook for its highly exciting future. Contents: Double Beta Decay OCo Historical Retrospective and Perspectives; Original Articles: From the Early Days until the Gauge Theory Era; The Nuclear Physics Side OCo Nuclear Matrix Elements; The Nuclear Physics Side OCo Nuclear Matrix Elements; Effective Neutrino Masses from Double Beta Decay, Neutrino Mass Models and Cosmological Parameters OCo Present Status and Prospects; Other Beyond Standard Model Physics: From SUSY and Leptoquarks to Compositeness and Quantum Foam; The Experimental Race: From the Late Eighties to the Future; The Future of Double Beta Decay; Appendices: Ten Years of HeidelbergOCoMoscow Experiment; The Potential Future OCo GENIUS. Readership: Particle physicists, nuclear physicists and astrophysicists."

Download or read book The Tritium Recycling System for the Neutrino Mass Experiment at Texas NEXTEX written by Michael Eckart and published by . This book was released on 2004 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: For decades people have tried to measure the rest masses of the neutrinos, but this quest has not yet been successful. The most commonly used method to determine the rest mass of the electron anti-neutrino is to measure the high energy end of the tritium beta decay spectrum. Various experiments suffered from conceptional problems, so that currently only an upper limit of 2.3 eV is known for the rest mass of the electron anti-neutrino. The Neutrino Experiment at the University of Texas (NEXTEX) has been thoroughly designed to avoid many problems that have been encountered in former attempts to measure the rest mass. The goal of NEXTEX is to lower the upper limit to less than 0.8 eV and by doing so possibly measure the rest mass of the electron anti-neutrino for the first time. The tritium recycling system is an important part of this experiment and the purpose of this thesis is not only to describe this recycling system in detail, but also to provide information about various potential problems that might arise and how they have been solved. These potential problems include catalysts, unwanted surface reactions and the solubility of tritium in Fomblin. The latter has just recently been investigated and a great deal of attention will therefore be dedicated to the presentation of the latest results.

Download or read book Los Alamos Free Molecular and Atomic Tritium Beta Decay Experiment written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An initial measurement of the tritium beta spectrum spanning an energy range of 16.4 - 18.9 keV has been performed using a free molecular tritium gas source. With the data from this preliminary low statistics measurement (approx. 72 hours of data), we are able to set an upper limit on the electron-antineutrino mass of 36 eV at the 95% confidence level. Measurements with a gaseous source eliminate many of the ambiguities arising from uncertainties associated with solid-source-based measurements. The ultimate neutrino mass sensitivity of our system should be about 10 eV or less. 13 refs., 9 figs.