Measurement of a High Energy Resolution and High Statistics 163Ho Electron Capture Spectrum for the ECHo Experiment PDF Download

Author: Clemens Velte
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: David A. Cardwell
Publisher: CRC Press
ISBN: 1000342301
Category : Science
Languages : en
Pages : 881

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This is the last of three volumes of the extensively revised and updated second edition of the Handbook of Superconductivity. The past twenty years have seen rapid progress in superconducting materials, which exhibit one of the most remarkable physical states of matter ever to be discovered. Superconductivity brings quantum mechanics to the scale of the everyday world. Viable applications of superconductors rely fundamentally on an understanding of these intriguing phenomena and the availability of a range of materials with bespoke properties to meet practical needs. While the first volume covers fundamentals and various classes of materials, the second addresses processing of these into various shapes and configurations needed for applications, and ends with chapters on refrigeration methods necessary to attain the superconducting state and the desired performance. This third volume starts with a wide range of methods permitting one to characterize both the materials and various end products of processing. Subsequently, diverse classes of both large scale and electronic applications are described. Volume 3 ends with a glossary relevant to all three volumes. Key Features: Covers the depth and breadth of the field Includes contributions from leading academics and industry professionals across the world Provides hands-on familiarity with the characterization methods and offers descriptions of representative examples of practical applications A comprehensive reference, the handbook is suitable for both graduate students and practitioners in experimental physics, materials science, and multiple engineering disciplines, including electronic and electrical, chemical, mechanical, metallurgy and others.

Author: Loredana Gastaldo
Publisher:
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Category :
Languages : en
Pages :

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Author: Rathnayake Mudiyanselage Eranjan Bandara Kandegedara
Publisher:
ISBN:
Category : Calorimeters
Languages : en
Pages : 128

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Author: Thomas Beyer
Publisher: Frontiers Media SA
ISBN: 2889458040
Category :
Languages : en
Pages : 190

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Launched in 2013, Frontiers in Physics consists of 18 specialties covering all areas of research in physics. With over 500 published manuscripts, the journal is now indexed in SCIE with the first impact factor coming in 2019. Frontiers in Physics aims to become the largest and most cited open access multidisciplinary physics journal. This eBook collects what the Specialty Chief Editors of the journal believed were the most interesting manuscripts published over the past two years. It is a nice collection, which will offer the reader the chance to have a quick overview of the specialties of the journal and offer a glimpse into the state of the art of physics. We must confess that it has been quite challenging to select only one article per specialty section given the many important manuscripts published by the journal in 2017 and 2018. We invite our reader to have a look at the journal homepage and browse what we have published so far. It includes articles on topics very different from each other, written by both early career scientists and well-known researchers, ranging from the indisputable advance of the field to the more bold. We hope you enjoy reading our first edition of the Frontiers in Physics Editor's Choice eBook! Professor Alex Hansen (Field Chief Editor) and Dr Claudio Bogazzi (Journal Manager)

Author: Alexander Sebastian Göggelmann (geb. Ziegenbein)
Publisher:
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Category :
Languages : en
Pages : 0

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The aim of the Electron Capture Ho-163 (ECHo) experiment is the determination of the effective electron neutrino mass. This should be achieved by analyzing the Ho-163 electron capture (EC) spectrum recorded by Ho-implanted metallic magnetic calorimeters (MMCs) arranged in a pixelized array. The influence of the neutrino mass on the shape of the Ho-163 EC spectrum is strongest at the endpoint region around Q_EC ~ 2.8 keV. However, the fraction of events in the region of interest (ROI) of 10 eV below Q_EC is only in the order of 10^-9 resulting in low count rates of the order of 10^-4 counts per day and pixel for an activity of 1 Bq of Ho-163 per MMC pixel. Thus, the description of the endpoint region has to rely on the precise knowledge of the expected Ho-163 events and background events. The background in the ROI is aimed to be dominated by unresolved pile-up, which is expected to be in the order of 10^-6 to 10^-5 counts per day and pixel. In this work, the expected background caused by cosmic muons and natural occurring radionuclides located in the next surrounding of the detector arrays is discussed. For this purpose, Monte Carlo simulations based on the GEANT4 framework are performed to study the energy deposition in the MMCs due to muons and radiation produced by muons propagating through materials surrounding the detector array. Results of screening measurements of materials used in the first stage of the ECHo experiment, ECHo-1k, are used as basis for simulations of radioisotopes in materials close to the detector array. The results of the simulations of radioactive contamination is compared with a background spectra acquired by non-Ho-implanted pixels, while the simulation of muonic background is compared to data acquired by a measurement including an active muon veto installed around the cryostat used for the operation of the detectors. A pulse shape analysis of pulses received by the MMCs is used to identify Ho-163 induced and similar events caused by particles stopped in the MMCs, and is used to identify events generated by muons.

Author: Geoffrey Duxbury
Publisher: CRC Press
ISBN: 1315355507
Category : Science
Languages : en
Pages : 319

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Over recent years electronic spectroscopy has developed significantly, with key applications in atmospheric chemistry, astrophysics and astrochemistry. High Resolution Electronic Spectroscopy of Small Molecules explores both theoretical and experimental approaches to understanding the electronic spectra of small molecules, and explains how this information translates to practice. Professors Geoffrey Duxbury and Alexander Alijah present the links between spectroscopy and photochemistry, and discuss theoretical treatments of the interaction between different electronic states. They provide a thorough discussion of experimental techniques, and explore practical applications. This book will be an indispensable reference for graduate students and researchers in physics and chemistry working on theoretical and practical aspects of electronic spectra, as well as atmospheric scientists, photochemists, kineticists and professional spectroscopists.

Author: Magnus Schlösser
Publisher: Springer
ISBN: 3319062212
Category : Science
Languages : en
Pages : 226

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Neutrinos can arguably be labeled as the most fascinating elementary particles known as their small but non-zero rest mass points to new mass generating mechanisms beyond the Standard Model, and also assigns primordial neutrinos from the Big Bang a distinct role in shaping the evolution of large-scale structures in the universe. The open question of the absolute neutrino mass scale will be addressed by the Karlsruhe Tritium Neutrino (KATRIN) experiment, currently under construction. This thesis reports major contributions to developing and implementing new laser-spectroscopic precision tools to continuously monitor the isotope content of the windowless gaseous tritium source of KATRIN. The method of choice, Raman spectroscopy, is ideally suited for in-situ monitoring of all six hydrogen isotopologues. In a series of beautiful experiments the author obtained two independent novel calibration methods, first based on a comparison of experimental Raman depolarization ratios with corresponding quantum-chemical calculations, and second on a gas sampling technique. Both methods yield consistent cross-calibration results and, as well as yielding improvements in precision, will be of major importance in reducing systematic effects in long-term neutrino mass measurements. The methods developed in this thesis also have great potential to further broaden the applications of Raman spectroscopy to study extended sources such as in atmospheric physics.

Author: Ramesh Bhandari
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 98

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Author: Martin Braß
Publisher:
ISBN:
Category :
Languages : en
Pages :

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