Download or read book Positron Scattering in Gases written by John W. Humberston and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first conference in this series, devoted principally to the interaction of positrons in gases, was held at York University, Toronto, in July 1981 immediately preceding the XII ICPEAC in Gatlinburg, and the proceedings were published in the Canadian Journal of Physics, volume 60 (1982). So successful was this meeting that the decision was taken to hold a second one around the time of XIII ICPEAC in Berlin in 1983. London was clearly a convenient location but, rather than the obvious choice of University College London in central London, the Organising Committee decided that the beautiful and peaceful surroundings of Royal Holloway College would provide a more pleasant and intimate atmosphere for a small meeting. Even a small conference requires substantial sums of money to pay the expenses of invited speakers and when considering possible sources of funds the Organising Committee recognised that the intended format of the meeting and the international composition of the participants made it appropriate to apply to the NATO Science Committee for support under the Advanced Research Workshop Programme. This was one of the few successful applications made this year, and so it was that the conference became the 'NATO Advanced Research Workshop on Positron Scattering in Gases'. The Workshop, with approximately sixty participants, started after lunch on 19 July, 1983 and finished at mid-day on 23 July.
Download or read book Positron Electron Gas Scattering Proceedings Of The 3rd International Workshop written by Walter E Kauppila and published by World Scientific. This book was released on 1986-04-01 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: This workshop discusses the current state and future directions of research in positron — gas scattering, particularly in the relationship between positron and electron scattering by the same atoms and molecules. The possible applications of positron — gas scattering to astrophysical phenomena have also been discussed.
Download or read book Positron Scattering by Positronium and the Noble Gases written by Sharon Gilmore and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Positron Scattering and Annihilation in Gases written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron and Positron Scattering in Atomic and Molecular Gases written by David Darryl Reid and published by . This book was released on 1995 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Third International Workshop on Positron Electron Gas Scattering Wayne State University Detroit Michigan July 16 18 1985 written by Walter E. Kauppila and published by . This book was released on 1986 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Results for Positron Scattering from Noble Gas Atoms and Diatomic Molecules written by Joan Phyllis Marler and published by . This book was released on 2005 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the International Conference on Positron Scattering and Annihilation in Gases York University Toronto Canada July 10 11 1981 written by International Conference on Positron Scattering and Annihilation in Gases (1981 : Toronto, Ont.) and published by Ottawa, Ont. : National Research Council Canada. This book was released on 1982 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Positron Scattering and Annihilation in Gases written by and published by . This book was released on 1982 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Third International Workshop on Positron Electron Gas Scattering Wayne State University Detroit Michigan July 16 18 1985 written by Walter E. Kauppila and published by World Scientific Publishing Company Incorporated. This book was released on 1986 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of gas discharges positron scattering and gase phase ions written by Frank Martin Harris and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Energy Positron Scattering from Atoms and Molecules written by Joshua Reuben Machacek and published by . This book was released on 2013 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low energy positron scattering has been conducted for over 40 years and large discrepancies (> 20%) in the measured cross sections have plagued both experimental and theoretical results. The advent of the Surko buffer-gas trap has provided for sufficiently large numbers of positrons, with previously unmatched angular and energy distributions, which has allowed for the measurement of absolute cross sections with absolute uncertainties of less than 10%. Continual improvement of the experimental techniques has allowed for the separation of the partial scattering channels. These results are crucial for testing our theoretical understanding of the scattering process and for modeling of positron transport in complex systems. The experiments reported in this thesis used a scattering apparatus which incorporated a radiative sodium-22 source of positrons that were moderated using solid neon and cooled further by a Surko buffer-gas trap. Those positrons were subsequently scattered from various atomic and molecular gases in a cylindrical scattering cell. Scattered and unscattered positrons emerging from the scattering cell were energy analysed with a retarding potential analyser to determine their energy loss, which enabled the determination of various scattering cross sections. Absolute elastic differential, grand total, total elastic, total inelastic and positronium formation scattering cross sections for energies between 1 and 200 eV are presented for a number of atomic and molecular species. Where possible, knowledge of the experimental limitations are combined with theoretical calculations to estimate the amount of the angular scattering missed due to the finite angular resolution of the experiment. Comparison of both grand total and partial total cross sections are compared to a number of theoretical calculations and previous experimental results, again where possible. A rotating electric field, or 'rotating-wall' electrode, was implemented to increase the central density of the positron beam. The operational phase space was explored in the context of the standard running parameters of this Surko-trap system used for atomic and molecular scattering experiments. Mechanisms for compression are reviewed in the context of applicability to the operational parameters of the trap and in the understanding of the dominant mechanism. The limitations in the implementation are discussed in regard to scattering experiments from atoms and molecules.
Download or read book Search for Resonant States in Positron electron Scattering Using a Positron Gas Target written by and published by . This book was released on 1990 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Narrow correlated positron-electron peaks discovered in superheavy nuclear collisions may be signatures for previously undetected neutral particle-like objects having masses of 1--2 MeV/c2. We have designed an experiment to definitively test this hypothesis by searching for resonant states formed directly in the scattering of monoenergetic electrons incident on a gas of cold positrons confined magnetically in a Malmberg trap. This technique will provide a hundred-fold improvement in sensitivity to ee− resonances compared to previous positron-beam, thin-foil scattering experiments. Together with a recoil-shadow technique, this experiment will explore a five decade range in neutral-particle lifetimes (10−13s to 10−8s) which cannot be probed directly to other methods. 14 refs., 2 figs., 1 tab.
Download or read book Positron gas Scattering Utilizing a Time of flight Technique written by John R. Burciaga and published by . This book was released on 1977 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atomic Physics with Positrons written by J.W. Humberston and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NATO Advanced Research Workshop on Atomic Physics with Positrons, which was held at University College London during 15-18 July 1987, was the fourth meeting in a series devoted to the general theme of positron colli sions in gases. Previous meetings have been held at York University, Toronto (1981); Royal Holloway College, Egham (1983) and Wayne State Uni versity, Detroit (1985). Recent very significant improvements in positron beam currents, due to the development of more efficient moderators and the use of more intense positron sources, are making possible an increasingly sophisticated range of experiments in atomic collision physics. Whereas a few years ago only total scattering cross sections could be determined, measurements can now be made of various partial and differential cross sections. Intense positron beams are also being used to produce positronium beams and already, as reported here, preliminary investigations have been made of collisions of positronium with several target systems. These experimental developments have stimulated, and been stimulated by, steady, if somewhat less spectacu1ar,progress in associated theoretical studies. Both aspects of the field are well represented in these Proceed ings.
Download or read book Low Energy Positron Interactions with the Rare Gases written by Adric C. L. Jones and published by . This book was released on 2010 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents measurements of low-energy positron scattering from the noble gases. Sets of total cross section measurements are presented for Ne-Xe, and are compared with prior experimental and theoretical results. The present results represent a substantial improvement on previous experiments, due to improved statistical and systematic uncertainty, as well as an energy resolution that is better than that achieved in most other experiments. Methods for calculating cross sections in a strong magnetic field are discussed, along with improvements made to the techniques for analysis, and the handling and correction, or minimisation, of systematic errors.
Download or read book Spin dependent Deep Inelastic Positron Scattering from a Polarized Helium 3 Internal Gas Target written by Dirk De Schepper and published by . This book was released on 1997 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:
