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Precision Measurement Of The Neutron Lifetime With Ucnr Experiment
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Book Synopsis Precision Measurement of the Neutron Lifetime with UCNr Experiment by : Francisco Gonzalez (Physicist)
Download or read book Precision Measurement of the Neutron Lifetime with UCNr Experiment written by Francisco Gonzalez (Physicist) and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because it lacks an electric charge, the neutron is a useful probe of the electroweak framework of the Standard Model (SM), which describes the process as a particle undergoes radioactive decay. Neutrons are the simplest example of B-decay, which provides a unique suite of tests for fundamental parameters of electroweak theory.The neutron lifetime, rn, can be used in conjunction with its other decay properties to extract Vud. This can then be combined with other particle decays to investigate the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. By itself, neutron b-decay can be used to study the origins of matter in the universe, and even hunt for new novel decay modes. The UCNr experiment, at Los Alamos National Laboratory (LANL), is the world's most precise measurement of the neutron lifetime. UCNt traps Ultracold Neutrons (UCN) in a bottle of permanent magnets for periods of time longer than the neutron lifetime. This work presents the results of two calendar years of UCNr data taking, resulting in a lifetime with both statistical and systematic uncertainties below 0.3 s. The analysis has utilized new methods to minimize the uncertainties due to backgrounds and initial estimation of the number of trapped UCN. A suite of Monte Carlo simulations, in conjunction with data-driven measurements, have been used to demonstrate the loss rates of UCN in UCNr are below the statistical precision of the experiment. This analysis leads to a blinded lifetime result with uncertainties on rn of -+0.26 +0.21/−0.16s, or a relative precision of 4 x 10−4.
Book Synopsis Towards Precision Measurement of the Neutron Lifetime Using Magnetically Trapped Neutrons by : Liang Yang
Download or read book Towards Precision Measurement of the Neutron Lifetime Using Magnetically Trapped Neutrons written by Liang Yang and published by . This book was released on 2006 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Next Generation Experiments To Measure The Neutron Lifetime - Proceedings Of The Workshop by : Susan J Seestrom
Download or read book Next Generation Experiments To Measure The Neutron Lifetime - Proceedings Of The Workshop written by Susan J Seestrom and published by World Scientific. This book was released on 2014-03-28 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a great interest in improving the limits on neutron lifetime to the level of a precision of 0.1 s. The neutron lifetime is both an important fundamental quantity as well as a parameter influencing important processes such as nucleosynthesis (Helium production in the early universe) and the rate of energy production in the Sun.Aiming to create a roadmap of R&D for a next generation neutron lifetime experiment that can be endorsed by the North American neutron community, the focus of the workshop was on experiments using traps that utilize ultracold neutrons and confinement by a combination of magnetic and/or gravitational interaction in order to avoid systematic uncertainties introduced by neutron interactions with material walls. The papers in this volume summarize the limitations of present experiments, the discussion of new experiments in planning stage, and the discussion of systematic effects that must be addressed to achieve a lifetime measurement at an accuracy of 0.1 second.Cover image courtesy of Elena Fernández, Los Alamos National Laboratory.
Book Synopsis Development of a Precision Neutron Lifetime Measurement by : Christopher Martin O'Shaughnessy
Download or read book Development of a Precision Neutron Lifetime Measurement written by Christopher Martin O'Shaughnessy and published by . This book was released on 2010 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Towards a High Precision Measurement of the Free Neutron Lifetime with [tau]SPECT by : Kim Ulrike Roß
Download or read book Towards a High Precision Measurement of the Free Neutron Lifetime with [tau]SPECT written by Kim Ulrike Roß and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Lifetime Experiment Based on an Accordion-Like UCN Storage Volume Coated With “Low Temperature Fomblin” by :
Download or read book Neutron Lifetime Experiment Based on an Accordion-Like UCN Storage Volume Coated With “Low Temperature Fomblin” written by and published by DIANE Publishing. This book was released on with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Neutron Lifetime Using a Gravitational Trap and a Low-Temperature Fomblin Coating by :
Download or read book Measurement of the Neutron Lifetime Using a Gravitational Trap and a Low-Temperature Fomblin Coating written by and published by DIANE Publishing. This book was released on with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Progress Towards a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux by : Andrew Tsung-Tse Yue
Download or read book Progress Towards a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux written by Andrew Tsung-Tse Yue and published by . This book was released on 2011 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reported lifetime in an in-beam neutron lifetime experiment performed at NIST was [tau]n̳ = (886.3 ± 3.4) s [Nico et al., 2005b]. The largest source of uncertainty was the efficiency of the neutron flux monitor (0.3% relative uncertainty). The flux monitor operates by counting charged particles produced when neutrons impinge on a 6Li foil. Its efficiency was calculated from the 6Li thermal neutron cross section, the solid angle subtended by the charged particle detectors, and the amount of neutron-absorbing material present on the foil. An absolute black neutron detector for cold neutron beams has been developed to measure the efficiency without the need to know these quantities. The flux monitor efficiency is measured to a precision of 0.052% using this direct calibration technique. This calibration removes the largest barrier to a 1 s neutron lifetime measurement with the beam technique. It is hoped that this data can also be used to re-evaluate the current NIST neutron lifetime value, reduce its uncertainty, and remove the dependence on evaluated nuclear data files. There is also the possibility for a direct measurement of the 6Li thermal neutron cross section.
Book Synopsis On the Measurement the Neutron Lifetime Using Ultra-cold Neutrons in a Vacuum Quadrupole Trap by :
Download or read book On the Measurement the Neutron Lifetime Using Ultra-cold Neutrons in a Vacuum Quadrupole Trap written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a conceptual design for an experiment to measure the neutron lifetime ((almost equal to)882 s) with an accuracy of 10−4. The lifetime will be measured by observing the decay rate of a sample of UCNs confined in vacuum in a magnetic trap. The UCN collaboration at LANL has developed a prototype ultra-cold neutron UCN source that is expected to produce a bottled UCN density of more than 100 UCN/cm3. The availability of such an intense source makes it possible to approach the measurement of the neutron lifetime in a new way. We argue below that it is possible to measure the neutron lifetime to 10−4 in a vacuum magnetic trap. The measurement involves no new technology beyond the expected UCN density. If even higher densities are available, the experiment can be made better and/or less expensive. We present the design and methodology for the measurement. The slow loss of neutrons that have stable orbits, but are not energetically trapped would produce a systematic error in the measurement. We discuss a new approach, chaotic cleaning, to the elimination of quasi-neutrons from the trap by breaking the rotational symmetry of the quadrupole trap. The neutron orbits take on a chaotic character and mode mixing causes the neutrons on the quasi-bound orbits to leave the trap.
Book Synopsis An Experimental Study of Spatial Effects on Mean Neutron Lifetime Measurement by : William Bruce Hooke
Download or read book An Experimental Study of Spatial Effects on Mean Neutron Lifetime Measurement written by William Bruce Hooke and published by . This book was released on 1966 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Neutron Beta Decay Asymmetry Using Ultracold Neutrons by : Michael Praetorius Mendenhall
Download or read book Measurement of the Neutron Beta Decay Asymmetry Using Ultracold Neutrons written by Michael Praetorius Mendenhall and published by . This book was released on 2014 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: The free neutron beta decay correlation A0 between neutron polarization and electron emission direction provides the strongest constraint on the ratio [lambda] = g[sub-A]/g[sub-V] of the Axial-vector to Vector coupling constants in Weak decay. In conjunction with the CKM Matrix element V[sub-ud] and the neutron lifetime [tau sub-n], [lambda] provides a test of Standard Model assumptions for the Weak interaction. Leading high-precision measurements of A0 and [tau sub-n] in the 1995-2005 time period showed discrepancies with prior measurements and Standard Model predictions for the relationship between [lambda], [tau sub-n], and V[sub-ud]. The UCNA experiment was developed to measure A0 from decay of polarized ultracold neutrons (UCN), providing a complementary determination of [lambda] with different systematic uncertainties from prior cold neutron beam experiments. This dissertation describes analysis of the dataset collected by UCNA in 2010, with emphasis on detector response calibrations and systematics. The UCNA measurement is placed in the context of the most recent [tau sub-n] results and cold neutron A0 experiments.
Book Synopsis Precision Measurement of the Neutron Beta Asymmetry Using Ultracold Neutrons by : Robert Wayne Pattie (Jr.)
Download or read book Precision Measurement of the Neutron Beta Asymmetry Using Ultracold Neutrons written by Robert Wayne Pattie (Jr.) and published by . This book was released on 2012 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement of the Neutron Spin Structure Function by : Piotr A. Zyla
Download or read book Precision Measurement of the Neutron Spin Structure Function written by Piotr A. Zyla and published by . This book was released on 1998 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Lifetime Experiment Using UCN Storage in an 'accordion -like' Trap by : Ashish M. Desai
Download or read book Neutron Lifetime Experiment Using UCN Storage in an 'accordion -like' Trap written by Ashish M. Desai and published by . This book was released on 2012 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement of the Neutron Spin Dependent Structure Functions by : Yury G. Kolomensky
Download or read book Precision Measurement of the Neutron Spin Dependent Structure Functions written by Yury G. Kolomensky and published by . This book was released on 1997 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Method of Losses Calibration in Neutron Lifetime Experiment with UCN by :
Download or read book Method of Losses Calibration in Neutron Lifetime Experiment with UCN written by and published by . This book was released on 1991 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetic Trapping of Neutrons for Measurement of the Neutron Lifetime by : Sergei N. Dzhosyuk
Download or read book Magnetic Trapping of Neutrons for Measurement of the Neutron Lifetime written by Sergei N. Dzhosyuk and published by . This book was released on 2004 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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