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Saturday, July 25, 2020 | History

2 edition of Positron drift in noble gases. found in the catalog.

Positron drift in noble gases.

Jen-San Tsai

Positron drift in noble gases.

by Jen-San Tsai

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Published .
Written in English

    Subjects:
  • Physics Theses

  • Edition Notes

    Thesis (Ph.D.), Dept. of Physics, University of Toronto.

    ContributionsPaul, D. A. L. (supervisor)
    The Physical Object
    Pagination287 leaves
    Number of Pages287
    ID Numbers
    Open LibraryOL14671452M

    • “New Results in Positron Scattering from Noble Gas Atoms and Diatomic Molecules” ICPEAC Positron and Positronium Physics Satellite Workshop, Brazil, July • “Ionization and Positronium Formation in Noble Gases” International Con-ference on Photonic, Electronic, and Atomic Collisions (ICPEAC), Argentina, July Charge Carrier Drift in Gases Under High Pressure. Drift of Electrons in Gases. Drift of Ions in Gases. Drift of Charge Carriers in Condensed Phases. Drift of Electrons in Condensed Phases. Drift of Ions and Holes in Condensed Noble Gases. Charge Carrier Trapping. Electron Attachment in.

    drift velocity [m/s] Electron - flux and bulk Positron - flux Positron - bulk Ar Negative differential Conductivity -NDC Significantly different behavior of drift velocities for electrons and positrons! “R” = Ps formation ν’R > 0, W. Purchase Emission Tomography - 1st Edition. Print Book & E-Book. ISBN ,

    Noble Gas Detectors I. Why Noble Gas Detectors are Interesting for Medical Gamma-Ray Imaging A. Brief History of Gas Detectors B. Intrinsic Energy Resolution C. Position Resolution D. Technical Features II. Basic Processes of Energy Dissipation and Generation of Light Signals A. Ionization and Scintillation B. Drift of Charge Carriers.   Print book: Conference --Some theoretical aspects of positron and electron scattering by molecules / A. Jain --Differential cross-sections for positron noble gas collisions / R.P. McEachran and A.D. Stauffer --Total cross sections for the annihilation process / E. Ficocelli Varracchio --On positron drift velocities in gases.


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Positron drift in noble gases by Jen-San Tsai Download PDF EPUB FB2

Based on our previous experience with positron ionization, we propose a simple distorted-wave model for this process and apply it to the ionization of atomic and molecular hydrogen as well as the noble gases.

The advantage of having a single method that produces reliable results in all cases is discussed. PACS No.: +xCited by: theoretical data for neon and the heavier noble-gas atoms. Understanding positron kinetics is also crucial for the development of efficient positron cooling in traps and accumulators [10] and for a cryogenically cooled, ultra-high-energy-resolution, trap-based positron beam [11,12].

Halogens and Noble Gases examines the ways humans use halogens and noble gases and the resulting benefits and challenges to society, health, and the environment. Fluorine, chlorine, bromine, iodine, helium, and krypton are covered in this book, along with the fundamentals of chemistry and physics as well as possible future developments in.

\gamma$ spectra for positron annihilation in noble-gas atoms are calculated using many-body theory for positron momenta up to the positronium-formation threshold.

Sensitivity of drift velocity. Positron scattering and annihilation on noble gas atoms is studied ab initio using many-body theory methods for positron energies below the positronium formation threshold. We show that in this energy range the many-body theory yields accurate numerical results and provides a near-complete understanding of the positron-noble-gas-atom by:   This site uses cookies.

By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy. A proper theoretical treatment of positron scattering by the heavier noble gases poses major computational difficulties. Ideally, one would Positron drift in noble gases.

book to perform a calculation comparable to that of Campbell et al. for e + –He scattering. Campbell et al. used a coupled pseudostate approach which gives a complete dynamical description in the sense. Positron Ionization Mass Spectrometry: An Organic Mass Spectrometrist’s View.

Temperature Dependence of Positron Source Corrections. Gases. Time Dependence Behavior of Positrons in Noble Gases. Positron Collisions with Molecules: Cross Sections and Resonances.

Annihilation of Positron and Positronium in Dense Gases. Behavior of Light. Surko's research works with 9, citations and 2, reads, including: Instability of an electron-plasma shear layer in an externally imposed strain flow.

A transport theory that explicitly incorporates loss of flux due to annihilating collisions is developed and applied to low energy positron drift, diffusion and annihilation. The use of more complete momentum transfer and annihilation cross sections for helium and argon have resulted in improved descriptions of the time dependence of Zeff for.

energy positron scattering and annihilation rates on noble-gas atoms [6]. In this work we use our elastic scattering cross sections and Z eff, parameterized by Padé approximants, to study positron cooling and an-nihilation in noble gases via Monte Carlo simulation and. We report cross sections for positron collisions with the noble gases He, Ne, Ar, Kr and Xe.

These cross sections are for Ps(1s) formation and elastic scattering, and are calculated in the (truncated) coupled-static approximation.

Comparison is made with experiments which measure formation of positronium into all bound states. Noble Gas Detectors by Elena Aprile,available at Book Depository with free Carriers. Charge Carrier Drift in Gases Under High Pressure. Drift of Electrons in Gases.

Drift of Ions in Gases. Drift of Charge Carriers in Condensed Phases. Drift of Electrons in Condensed Phases. Drift. the metal-gas interface is found even in the cases, where the bulk gas is in a fluid phase.

The positron state calculations also cover the case of adsorbed noble gas layers at surfaces. For small vacancy-noble gas clusters complementary positron results obtained with the calculational method developed by Puska and Nieminen are presented.

Abstract. We review recent cross section results for low-energy positron scattering from atomic targets.

A comparison of the latest measurements and calculations for positron collisions with the noble gases and a brief update of the newest studies on other atoms.

Abstract: Understanding the dynamics of positron cooling in gases, including the fraction of positrons surviving to thermalisation, is critical for accurate interpretation of positron lifetime spectra, for the development of efficient positron cooling in traps and accumulators, and for a cryogenically cooled, ultra-high-energy-resolution, trap-based positron beam.

Noble Gas Detectors Elena Aprile, Aleksey E. Bolotnikov, Alexander I. Bolozdynya, Tadayoshi Doke This book discusses the physical properties of noble fluids, operational principles of detectors based on these media, and the best technical solutions to the design of these detectors.

Probing positron cooling in noble gases via annihilation spectra D. Green CentreforTheoreticalAtomic,MolecularandOpticalPhysics,SchoolofMathematicsandPhysics, Queen’s University Belfast, Belfast BT71NN, Northern Ireland, United Kingdom (Dated:September18,).

An introductory book on positron annihilation studies of defects in semiconduc-tors has also been written by Krause-Rehberg and Leip-ner ().

Our aim in writing this review is twofold. First, we want to introduce the basic concepts behind the experimental and theoretical methods of positron an.

McEachran, Robert; Stauffer, A D. Description. We apply our relativistic complex optical-potential method to investigate positron ionization of the noble gases: neon, argon, krypton and xenon.

The positron induced absolute single and double ionisation cross sections for the noble gases Ar, Kr and Xe have been determined in the energy region from below threshold to ∼ eV.

With the use of an admixture of He to the target gas normalisation was performed by comparison to known single ionisation cross sections for He. Special interest has been taken in the energy gap of eV below.This textbook provides a clear, concise and comprehensive review of the physical principles behind the devices used to detect charged particles and gamma rays, and the construction and performance of these many different types of detectors.

Detectors for high-energy particles and radiation are used in many areas of science, especially particle physics and nuclear physics experiments, nuclear Reviews: 1.Absolute measurements are presented for the positron-impact cross sections for direct ionization and posi-tronium formation of noble gas atoms in the range of energies from threshold to 90 eV.

The experiment uses a cold, trap-based positron beam and the technique of studying positron scattering in a strong magnetic field.