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Author : Christopher Martin O'Shaughnessy
Publisher :
ISBN 13 :
Total Pages : 161 pages
Book Rating : 4.:/5 (652 download)
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:
Author : Liang Yang
Publisher :
ISBN 13 :
Total Pages : 432 pages
Book Rating : 4.:/5 (228 download)
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:
Author : Susan J Seestrom
Publisher : World Scientific
ISBN 13 : 9814571687
Total Pages : 193 pages
Book Rating : 4.8/5 (145 download)
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.
Author : Francisco Gonzalez (Physicist)
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.5/5 (169 download)
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.
Author : Andrew Tsung-Tse Yue
Publisher :
ISBN 13 :
Total Pages : 173 pages
Book Rating : 4.:/5 (793 download)
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.
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Author : Kim Ulrike Roß
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)
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:
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development
Publisher :
ISBN 13 :
Total Pages : 1846 pages
Book Rating : 4.F/5 ( download)
Download or read book Energy and Water Development Appropriations for 1993 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 1992 with total page 1846 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Publisher : DIANE Publishing
ISBN 13 : 9781422328552
Total Pages : 6 pages
Book Rating : 4.3/5 (285 download)
Download or read book Measurement of the Neutron Lifetime by Counting Trapped Protons 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:
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Publisher : DIANE Publishing
ISBN 13 : 9781422328569
Total Pages : 6 pages
Book Rating : 4.3/5 (285 download)
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:
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development
Publisher :
ISBN 13 :
Total Pages : 2048 pages
Book Rating : 4.F/5 ( download)
Download or read book Energy and Water Development Appropriations for 1994 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 1993 with total page 2048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development
Publisher :
ISBN 13 :
Total Pages : 2038 pages
Book Rating : 4.0/5 (18 download)
Download or read book Energy and Water Development Appropriations for 1994: Department of Energy FY 1994 budget justifications written by United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 1993 with total page 2038 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher : DIANE Publishing
ISBN 13 : 9781422328323
Total Pages : 6 pages
Book Rating : 4.3/5 (283 download)
Download or read book Determination of the Neutron Lifetime Using Magnetically Trapped Neutrons 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:
Author : Rüdiger Picker
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (259 download)
Download or read book PENeLOPE and AbEx written by Rüdiger Picker and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 382 pages
Book Rating : 4.U/5 (183 download)
Download or read book Journal of Research of the National Institute of Standards and Technology written by and published by . This book was released on 2001 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kent Kwan Ho Leung
Publisher :
ISBN 13 :
Total Pages : 279 pages
Book Rating : 4.:/5 (844 download)
Download or read book Development of a New Superfluid Helium Ultra-cold Neutron Source and a New Magnetic Trap for Neutron Lifetime Measurements written by Kent Kwan Ho Leung and published by . This book was released on 2013 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (727 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 1284 pages
Book Rating : 4.3/5 (91 download)
Download or read book Energy and Water Development Appropriations for 2011, Part 3, February 2010, 111-2 Hearings written by and published by . This book was released on 2010 with total page 1284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
