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524.88 --- 524.88 Special hypotheses. Black holes. Antimatter --- Special hypotheses. Black holes. Antimatter --- Physics

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This book provides a comprehensive overview of positron profilometry, specifically focusing on the analysis of defect depth distribution in materials. Positron profilometry plays a crucial role in understanding and characterizing defects in a wide range of materials, including metals, semiconductors, polymers, and ceramics. By analyzing the depth distribution of defects, researchers can gain insights into various material properties, such as crystal structure, defect density, and diffusion behavior. The author's extensive research spanning a period of two decades has primarily centered on subsurface zones. These regions, located beneath the surface and subjected to various surface processes, play a crucial role in generating defect distributions. Three experimental techniques and their data analysis are described in detail: a variable-energy positron beam (VEP) called sometimes a slow positron beam, a technique called implantation profile depth scanning (DSIP), and a sequential etching (SET) technique. The usability of these techniques is illustrated by many examples of measurements by the author and others.

Materials --- Antimatter. --- Condensed matter. --- Building materials. --- Materials Characterization Technique. --- Matter-Antimatter Interactions. --- Condensed Matter Physics. --- Structural Materials. --- Analysis.

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Space and time --- Espace et temps --- 524.88 --- 524 --- Special hypotheses. Black holes. Antimatter --- Stars. Stellar systems. The Universe --- 524 Stars. Stellar systems. The Universe --- 524.88 Special hypotheses. Black holes. Antimatter --- Space of more than three dimensions --- Space-time --- Space-time continuum --- Space-times --- Spacetime --- Time and space --- Fourth dimension --- Infinite --- Metaphysics --- Philosophy --- Space sciences --- Time --- Beginning --- Hyperspace --- Relativity (Physics) --- Stars

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In the first fractions of a second after the Big Bang lingers a question at the heart of our very existence: why does the universe contain matter but almost no antimatter? The laws of physics tell us that equal amounts of matter and antimatter were produced in the early universe-but then something odd happened. Matter won out over antimatter; had it not, the universe today would be dark and barren.But how and when did this occur? In The Mystery of the Missing Antimatter, Helen Quinn and Yossi Nir guide readers into the very heart of this mystery-and along the way offer an exhilarating grand tour of cutting-edge physics.

Antimatter --- Particles (Nuclear physics) --- Cosmology --- Antimatière --- Particules (Physique nucléaire) --- Cosmologie --- Popular works. --- Ouvrages de vulgarisation --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Nuclear physics --- Matter --- Properties --- Antimatter - Popular works --- Particles (Nuclear physics) - Popular works --- Cosmology - Popular works

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This volume is the outgrowth of a workshop held in October, 2000 at the Institute for Theoretical Atomic and Molecular Physics at the Harvard- Smithsonian Center for Astrophysics in Cambridge, MA. The aim of this book (similar in theme to the workshop) is to present an overview of new directions in antimatter physics and chemistry research. The emphasis is on positron and positronium interactions both with themselves and with ordinary matter. The timeliness of this subject comes from several considerations. New concepts for intense positron sources and the development of positron accumulators and trap-based positron beams provide qualitatively new experimental capabilities. On the theoretical side, the ability to model complex systems and complex processes has increased dramatically in recent years, due in part to progress in computational physics. There are presently an intriguing variety of phenomena that await theoretical explanation. It is virtually assured that the new experimental capabilities in this area will lead to a rapid expansion of this list. This book is organized into four sections: The first section discusses potential new experimental capabilities and the uses and the progress that might be made with them. The second section discusses topics involving antihydrogen and many-body phenomena, including Bose condensation of positronium atoms and positron interactions with materials. The final two sections treat a range of topics involving positron and positronium interactions with atoms and molecules.

Antimatter. --- Antinucleons. --- Chemistry, Physical organic. --- Atomic, Molecular, Optical and Plasma Physics. --- Physical Chemistry. --- Condensed Matter Physics. --- Chemistry, Physical organic --- Chemistry, Organic --- Chemistry, Physical and theoretical --- Atoms. --- Physics. --- Physical chemistry. --- Condensed matter. --- Condensed materials --- Condensed media --- Condensed phase --- Materials, Condensed --- Media, Condensed --- Phase, Condensed --- Liquids --- Matter --- Solids --- Chemistry, Theoretical --- Physical chemistry --- Theoretical chemistry --- Chemistry --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Stereochemistry --- Constitution --- Properties