Download or read book Temperature Dependence of Positron Annihilation in Metals written by Barry T. A. McKee and published by . This book was released on 1964 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temperature Dependence of Doppler broadened Positron Annihilation Radiation in Hexagonal close packed Metals written by Brendan Anthony McClean and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book La D pendance Vis vis de la Temp rature de L annihilation Des Positrons Dans L alpha Hf written by G. M. Hood and published by Chalk River, Ont. : Chalk River Laboratories, Reactor Materials Research Branch. This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low temperature Effects in Metals as Observed by Positron Annihilation written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently published experimental positron annihilation data in metals have demonstrated exceptional temperature-dependent behavior in the prevacancy region. However, the magnitude of these effects seems at present to scatter widely among different observers. New lifetime and Doppler-broadening results for Au between 30 and 590°K are presented and compared to results obtained in other laboratories. Doppler-broadening results obtained for Cu in the temperature region 300 to 1310°K demonstrate that some temperature-dependent structure observed in the prevacancy region is related to the thermal history of the sample.
Download or read book Temperature Dependence of Positron Annihilation written by Robert Don Eagleton and published by . This book was released on 1962 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ANNIHILATION OF POSITRONS IN METALS written by Chanchal Kumar Majumdar and published by . This book was released on 1965 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theory of positron annihilation in metals, including electron-positron and electron-electron interaction, is discussed. It is well-known that the Coulomb force of the positron causes very major changes in the motion of the electrons. It is established that a sharp 'break' in the angular correlation curve of the two gamma-rays resulting from singlet state annihilation occurs at precisely those angles where it should be expected in the absence of electron-positron interaction. This makes positron annihilation in metals a useful tool for the investigation of the true Fermi surface. Taking advantage of such a break in the angular correlation curve, a simple experiment is proposed to measure the effective mass of the positron in metals. The experiment consists in a study of the temperature dependence of the angular correlation curve. It is found that an electron-positron bound state or a positronium-like state does not exist in metals. A more general result is derived: in a noninteracting electron gas in the presence of a localised external potential, there is no sharp distinction between bound and unbound states. (Author).
Download or read book Positron Annihilation written by A.T. Steward and published by Elsevier. This book was released on 2012-12-02 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: Positron Annihilation focuses on the process of positron annihilation in different environments. Partitioned into two parts with 42 chapters, the book contains the contributions of authors who have done research on the annihilation of positrons, which brought about valuable information on the properties of matter. The first part of the book deals with lengthy review articles, including a survey of the physics of positron annihilation; positron annihilation in metals and the theory involved in the process; and positron annihilation in alkali halides and ionic crystals. Positronium formation and interaction in gases, molecular substances, and ionic crystals are also given attention. Gaseous positronics and positron annihilation in condensed gases and liquids are also discussed. The second part of the book focuses on developments on positron annihilation and the direction of research on this field. The studies concentrate on positron annihilation in various crystals, metals, mercury, liquefied gases, helium, and metal oxides. Numerical representations and analyses are presented to support the processes involved. The book can best serve the interest of those who want to explore further the annihilation of positrons.
Download or read book The Temperature Dependence of Position Annihilation in Hf written by G. M. Hood and published by Chalk River, Ont. : Reactor Materials Research Branch, Chalk River Laboratories. This book was released on 1994 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory of the Temperature Dependence of Positron Bulk Lifetimes implications for Vacancy Formation Enthalpy Measurements Via Positron Experiments written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Temperature dependent effects, which may have a bearing on determinations of vacancy formation enthalpies in metals by positron annihilation, have been observed in certain metals. These effects have been observed to occur both at temperatures below those at which positron annihilation is most sensitive to equilibrium vacancies and at temperatures well within the vacancy-sensitive region. The effect of thermal lattice displacements on positron lifetimes in metals was investigated to help understand these phenomena. (GHT).
Download or read book Progress in Positron Annihilation written by Rados?aw Zaleski and published by Trans Tech Publications Ltd. This book was released on 2010-12-30 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The aim of this special collection is to present recent progress made, and reflect current ideas, in research fields where positron and positronium are involved. The contents cover a wide range of positron-related research topics; including both fundamental (theoretical calculations, radiation chemistry, hyperfine interactions, positronium physics and chemistry) and applied (metal, polymer, thin film and other materials, development of experimental techniques) aspects.
Download or read book Temperature Dependence of Positron Annihilation Parameters in Neutron Irradiated Molybdenum written by E. Pagh and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temperature Dependence of Positron Mean Lives in Metals written by Allan George Davison Jost and published by . This book was released on 1967 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electric Field and Temperature Dependence of Positron Annihilation in Argon Gas written by Gregory Frank Lee and published by . This book was released on 1971 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temperature Effects in the Annihilation of Positrons written by Robert Thomas Wagner and published by . This book was released on 1955 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dependence of Positron Annihilation Parameters on the Microvoid Size in Metals written by P. Hautojärvi and published by . This book was released on 1976 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Positron Annihilation written by and published by . This book was released on 1967 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Positron Annihilation written by L. Dorikens-Vanpraet and published by . This book was released on 1989 with total page 1038 pages. Available in PDF, EPUB and Kindle. Book excerpt:
