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Author : Chen-Yu Liu
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (547 download)
Download or read book A Superthermal Ultra-cold Neutron Source written by Chen-Yu Liu and published by . This book was released on 2002 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of a Superthermal Ultracold Neutron Source Based on a Solid Deuterium Converter for the TRIGA Mainz Reactor written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Research in fundamental physics with the free neutron is one of the key tools for testing the Standard Model at low energies. Most prominent goals in this field are the search for a neutron electric dipole moment (EDM) and the measurement of the neutron lifetime. Significant improvements of the experimental performance using ultracold neutrons (UCN) require reduction of both systematic and statistical errors.rnThe development and construction of new UCN sources based on the superthermal concept is therefore an important step for the success of future fundamental physics with ultracold neutrons. rnSignificant enhancement of today available UCN densities strongly correlates with an efficient use of an UCN converter material. The UCN converter here is to be understood as a medium which reduces the velocity of cold neutrons (CN, velocity of about 600 m/s) to the velocity of UCN (velocity of about 6 m/s).rnSeveral big research centers around the world are presently planning or constructing new superthermal UCN sources, which are mainly based on the use of either solid deuterium or superfluid helium as UCN converter.rnThanks to the idea of Yu. Pokotilovsky, there exists the opportunity to build competitive UCN sources also at small research reactors of the TRIGA type. Of course these smaller facilities don't promise high UCN densities of several 1000 UCN/cm3, but they are able to provide densities around 100 UCN/cm3 for experiments.rnIn the context of this thesis, it was possible to demonstrate succesfully the feasibility of a superthermal UCN source at the tangential beamport C of the research reactor TRIGA Mainz. Based on a prototype for the future UCN source at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRMII) in munich, which was planned and built in collaboration with the Technical University of Munich, further investigations and improvements were done and are presented in this thesis. rnIn parallel, a second UCN source for the radial beamport D was designed.
Author : R. Golub
Publisher : Routledge
ISBN 13 : 1351406396
Total Pages : 328 pages
Book Rating : 4.3/5 (514 download)
Download or read book Ultra-Cold Neutrons written by R. Golub and published by Routledge. This book was released on 2017-07-12 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-Cold Neutrons is a complete, self-contained introduction and review of the field of ultra-cold neutron (UCN) physics. Over the last two decades, developments in UCN technology include the storage of UCN in material and magnetic bottles for time periods limited only by the beta decay rate of the free neutron. This capability has opened up the possibility of a wide range of applications in the fields of both fundamental and condensed state physics. The book explores some of these applications, such as the search for the electric dipole moment of the neutron that constitutes the most sensitive test of time reversal invariance yet devised. The book is suitable as an introduction to the field for research students, as a useful compendium of results and techniques for researchers, and is of general interest to nonspecialists in other areas of physics such as neutron, atomic, and fundamental physics and neutron scattering.
Author : Philipp Anton Schmidt-Wellenburg
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (633 download)
Download or read book Development and Tests of a Superthermal Helium-4 Source for the Production of Ultra Cold Neutrons written by Philipp Anton Schmidt-Wellenburg and published by . This book was released on 2005 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Albert Steyerl
Publisher : World Scientific
ISBN 13 : 9811212724
Total Pages : 500 pages
Book Rating : 4.8/5 (112 download)
Download or read book Ultracold Neutrons written by Albert Steyerl and published by World Scientific. This book was released on 2020-05-26 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultracold Neutrons is a guide to a fascinating topic. It describes how a simple new idea in experimental neutron physics has changed the landscape of what is often called 'fundamental physics.' Ultracold neutrons (UCNs) are neutrons moving at the low speed of a bicycle rider. They were produced for the first time 50 years ago (in 1968) and are distinguished from ordinary neutrons with much higher energies by their ability to be confined in 'neutron bottles' for durations up to several hundred seconds. This is possible since they are reflected back and forth from the container walls many thousands of times with very little loss. As a result of these long observation times, their properties and interactions with the environment can be studied with superb precision.Directed towards a general readership, this book is an excellent introduction to a field of research that is not highly specialized but touches on many aspects of our physical world, classical as well as quantum mechanical.
Download or read book Characterization of Solid Deuterium Ultra-cold Neutron Source Production and UCN Transport written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultracold neutrons (UCN) are neutrons with energies below about 330 neV, making it possible to store them in material bottles for hundreds of seconds and guide them into a variety of experiments. Until recently, the available UCN flux has limited the range of problems which can be addressed with UCN. In 2000, a series of experiments at LANSCE demonstrated that a solid deuterium superthermal source, coupled to a spallation target, can potentially provide orders of magnitude improvements in useful UCN density. Since these prototype experiments, a production UCN source has been constructed for the UCNA collaboration in Line B at LANSCE, and another solid deuterium source has been designed to operate at the PULSTAR reactor at NC State university, based on the similar principles. This work will present the initial results and analysis of the LANL UCN source performance and some of the development and design issues for the PULSTAR source. Also a Monte-Carlo analysis of UCN depolarization measurement had been included as a UCN transport study.
Author : R. Golub
Publisher : CRC Press
ISBN 13 : 135140640X
Total Pages : 317 pages
Book Rating : 4.3/5 (514 download)
Download or read book Ultra-Cold Neutrons written by R. Golub and published by CRC Press. This book was released on 2017-07-12 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-Cold Neutrons is a complete, self-contained introduction and review of the field of ultra-cold neutron (UCN) physics. Over the last two decades, developments in UCN technology include the storage of UCN in material and magnetic bottles for time periods limited only by the beta decay rate of the free neutron. This capability has opened up the possibility of a wide range of applications in the fields of both fundamental and condensed state physics. The book explores some of these applications, such as the search for the electric dipole moment of the neutron that constitutes the most sensitive test of time reversal invariance yet devised. The book is suitable as an introduction to the field for research students, as a useful compendium of results and techniques for researchers, and is of general interest to nonspecialists in other areas of physics such as neutron, atomic, and fundamental physics and neutron scattering.
Author : Thorsten Lauer
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.:/5 (642 download)
Download or read book Investigation of a Superthermal Ultracold Neutron Source Based on a Solid Deuterium Converter for the TRIGA Mainz Reactor written by Thorsten Lauer and published by . This book was released on 2010 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. Yoshiki
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (354 download)
Download or read book Operation of a superthermal ultra-cold neutron converter written by H. Yoshiki and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C. I. Jewell
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (535 download)
Download or read book The Interaction of Ultra-cold Neutrons with Superfluid 4HE and a New Possible Thermal Ultra-cold Neutron Source written by C. I. Jewell and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (222 download)
Download or read book Operation of a superthermal ultra-cold neutron converter (in Japanese) written by and published by . This book was released on with total page 14 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 : Vladimir Kazimirovich Ignatovich
Publisher :
ISBN 13 :
Total Pages : 424 pages
Book Rating : 4.:/5 (41 download)
Download or read book The Physics of Ultracold Neutrons written by Vladimir Kazimirovich Ignatovich and published by . This book was released on 1990 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Slow-moving, low-energy ultracold neutrons provide an important tool for investigations in physics. They can be kept in hermetically sealed vessels for up to 15 minutes before they decay, allowing researchers sufficient time to observe the action of very weak fields and yielding valuable insights into neutron properties. In addition to describing how these particles are produced, detected, and analyzed, this book provides coverage of improvements in the techniques of ultracold neutron science--with information on how physicists may increase storage times--and explores ways they can be used for fundamental and applied research. Areas of study reported on include the determination of an upper limit to the electric dipole moment of neutrons, improved measurements of decay time, and new approaches to diffraction and diffusion theory. Although the text avoids mathematical detail, this is covered in appendices at chapter ends. The material is intended for specialists in neutron physics.
Author : Christopher R Gould
Publisher : World Scientific
ISBN 13 : 9814490768
Total Pages : 268 pages
Book Rating : 4.8/5 (144 download)
Download or read book Fundamental Physics With Pulsed Neutron Beams (Fppnb 2000) written by Christopher R Gould and published by World Scientific. This book was released on 2001-06-05 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low energy neutron beams are used to address many questions in nuclear physics, particle physics and astrophysics. The scientific issues include elucidating the nature of time reversal noninvariance; understanding the origin of the baryon asymmetry in the Universe; describing the weak interaction between quarks and between nucleons; understanding the origin of the elements in stellar and big bang nucleosynthesis.This book summarizes how spallation neutron sources work and discuss the advantages of pulsed beams in reducing systematic errors in precision measurements. It also describes recent breakthroughs in ultracold neutron production, together with the physics that will be addressed by the new generation of intense neutron sources.
Download or read book The Temperature Dependence of Ultra-cold Neutron Wall Losses in Material Bottles Coated with Deuterated Polystryene written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-cold neutrons (UCN) from the LANSCE super-thermal deuterium source were used to fill an acrylic bottle coated with deuterated polystyrene. The bottle was constructed to minimize losses through the filling valve. The storage time was extracted from a series of measurements where the number of neutrons was counted after they were held in the bottle for durations varying from 60-1200 s. The data were collected at temperatures of 18, 40, 65, 105, and 295 K. The data has been analyzed in terms of the ratio of the imaginary to real part of the wall potential. The analysis considers the velocity dependence of the probability per bounce of wall loss. The implication of these measurements for the SNS electric dipole moment search will be presented.
Author :
Publisher :
ISBN 13 :
Total Pages : 69 pages
Book Rating : 4.:/5 (684 download)
Download or read book Use of Ultracold Neutrons for Condensed-matter Studies written by and published by . This book was released on 1997 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultracold neutrons have such low velocities that they are reflected by most materials at all incident angles and can be stored in material bottles for long periods of time during which their intrinsic properties can be studied in great detail. These features have been mainly used for fundamental-physics studies including the detection of a possible neutron electric dipole moment and the precise determination of neutron-decay properties. Ultracold neutrons can also play a role in condensed-matter studies with the help of high-resolution spectrometers that use gravity as a strongly dispersive medium for low-velocity neutrons. Such studies have so far been limited by the low intensity of existing ultracold-neutron sources but could be reconsidered with more intense sources, which are now envisaged. This report provides a broad survey of the properties of ultracold neutrons (including their reflectivity by different types of samples), of ultracold-neutron spectrometers that are compared with other high-resolution instruments, of results obtained in the field of condensed matter with these instruments, and of neutron microscopes. All these subjects are illustrated by numerous examples.
Author : France. Commissariat général du plan
Publisher :
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.:/5 (492 download)
Download or read book Troisième plan 1958-1961 written by France. Commissariat général du plan and published by . This book was released on 1959 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
