Download or read book The pi sup emission Puzzle in 4 Over Lambda He Decay written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The observed [pi][sup +] emission from the weak decay of 4 over [Lambda] He has long been an intriguing puzzle. Experimentally, the [pi][sup +] to [pi][sup [minus]] ratio for 4 over [Lambda] He decay is about 5%. Because mesonic decay modes of the free [Lambda] ([yields] p + [pi][sup [minus]], n + [pi][sup 0]) produce no [pi][sup +]s, more complicated mechanisms must be responsible for the [pi][sup +] decay of 4 over [Lambda] He. Dalitz and von Hippel explored two-body decay processes of the type: (1) [Lambda] [yields] [pi][sup 0] + n decay followed by a [pi][sup 0] + p [yields] [pi][sup +] + n charge-exchange reaction, and (2) [Sigma][sup +] [yields] [pi][sup +] + n decay following a [Lambda] + p [yields] [Sigma][sup +] + n conversion. They concluded that neither process could account for even a 1% [pi][sup +] + n decay as a p-wave process ruled out the promising explanation coming from von Hippel's calculations, which had found that s-wave [Sigma][sup +] decay might yield a sufficiently high rate. Cieply and Gal re-examined the charge-exchange contribution and concluded that, although up-to-date input parameters yield a 1.2% branching ratio, the charge-exchange mechanism cannot account for the experimental value of about 5%.
Download or read book The emission Puzzle in 4 Over Lambda He Decay written by and published by . This book was released on 1997 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The observed? emission from the weak decay of 4 over? He has long been an intriguing puzzle. Experimentally, the?+ to?− ratio for 4 over? He decay is about 5%. Because mesonic decay modes of the free? (2!p +?−, n +?°) produce no?+s, more complicated mechanisms must be responsible for the?+ decay of 4 over? He. Dalitz and von Hippel explored two-body decay processes of the type: (1)? 2!?° + n decay followed by a?° + p 2!?+ + n charge-exchange reaction, and (2)?+ 2!?+ + n decay following a? + p 2!?+ + n conversion. They concluded that neither process could account for even a 1%?+ + n decay as a p-wave process ruled out the promising explanation coming from von Hippels̀ calculations, which had found that s-wave?+ decay might yield a sufficiently high rate. Cieply and Gal re-examined the charge-exchange contribution and concluded that, although up-to-date input parameters yield a 1.2% branching ratio, the charge-exchange mechanism cannot account for the experimental value of about 5%.
Download or read book The pi sup Decay of Light Hypernuclei written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The observed [pi][sup +] emission from the weak decay of the [sup 4][sub [Lambda]]He hypernucleus has been an intriguing puzzle for more than 30 years, because the Lambda decays in free space only by emission of a [pi][sup [minus]] or a [pi][sup 0]. We re-examine this puzzling weak decay with our focus upon a decay mechanism involving the [Sigma][sup +]N [r-arrow] [pi][sup +]nN decay of a virtual [Sigma][sup +], stemming from [Lambda]N to [Sigma]N conversion (mixing) within the hypernucleus. We emphasize the observed energy distribution of the observed [pi][sup +]s compared to that of [pi][sup -]s in standard mesonic decay as well as the isotropic angular distribution of the [pi] [sup +]s. Competing suggestions to explain the positive pion weak decay have been offered. A possible search for [pi][sup +] decay from the other [Lambda] hypernuclei is explored as means to test our hypothesis.
Download or read book Introduction to High Energy Physics written by Donald H. Perkins and published by Cambridge University Press. This book was released on 2000-04-13 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly-regarded text provides a comprehensive introduction to modern particle physics. Extensively rewritten and updated, this 4th edition includes developments in elementary particle physics, as well as its connections with cosmology and astrophysics. As in previous editions, the balance between experiment and theory is continually emphasised. The stress is on the phenomenological approach and basic theoretical concepts rather than rigorous mathematical detail. Short descriptions are given of some of the key experiments in the field, and how they have influenced our thinking. Although most of the material is presented in the context of the Standard Model of quarks and leptons, the shortcomings of this model and new physics beyond its compass (such as supersymmetry, neutrino mass and oscillations, GUTs and superstrings) are also discussed. The text includes many problems and a detailed and annotated further reading list.
Download or read book Particle Physics written by Necia Grant Cooper and published by CUP Archive. This book was released on 1988-04-29 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explains the emergence of a profoundly new understanding of the fundamental forces of Nature.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Complexity written by M. Mitchell Waldrop and published by Open Road Media. This book was released on 2019-10-01 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: “If you liked Chaos, you’ll love Complexity. Waldrop creates the most exciting intellectual adventure story of the year” (The Washington Post). In a rarified world of scientific research, a revolution has been brewing. Its activists are not anarchists, but rather Nobel Laureates in physics and economics and pony-tailed graduates, mathematicians, and computer scientists from all over the world. They have formed an iconoclastic think-tank and their radical idea is to create a new science: complexity. They want to know how a primordial soup of simple molecules managed to turn itself into the first living cell—and what the origin of life some four billion years ago can tell us about the process of technological innovation today. This book is their story—the story of how they have tried to forge what they like to call the science of the twenty-first century. “Lucidly shows physicists, biologists, computer scientists and economists swapping metaphors and reveling in the sense that epochal discoveries are just around the corner . . . [Waldrop] has a special talent for relaying the exhilaration of moments of intellectual insight.” —The New York Times Book Review “Where I enjoyed the book was when it dove into the actual question of complexity, talking about complex systems in economics, biology, genetics, computer modeling, and so on. Snippets of rare beauty here and there almost took your breath away.” —Medium “[Waldrop] provides a good grounding of what may indeed be the first flowering of a new science.” —Publishers Weekly
Download or read book Noncommutative Geometry written by Alain Connes and published by Springer. This book was released on 2003-12-15 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noncommutative Geometry is one of the most deep and vital research subjects of present-day Mathematics. Its development, mainly due to Alain Connes, is providing an increasing number of applications and deeper insights for instance in Foliations, K-Theory, Index Theory, Number Theory but also in Quantum Physics of elementary particles. The purpose of the Summer School in Martina Franca was to offer a fresh invitation to the subject and closely related topics; the contributions in this volume include the four main lectures, cover advanced developments and are delivered by prominent specialists.
Download or read book Effective Computation in Physics written by Anthony Scopatz and published by "O'Reilly Media, Inc.". This book was released on 2015-06-25 with total page 567 pages. Available in PDF, EPUB and Kindle. Book excerpt: More physicists today are taking on the role of software developer as part of their research, but software development isnâ??t always easy or obvious, even for physicists. This practical book teaches essential software development skills to help you automate and accomplish nearly any aspect of research in a physics-based field. Written by two PhDs in nuclear engineering, this book includes practical examples drawn from a working knowledge of physics concepts. Youâ??ll learn how to use the Python programming language to perform everything from collecting and analyzing data to building software and publishing your results. In four parts, this book includes: Getting Started: Jump into Python, the command line, data containers, functions, flow control and logic, and classes and objects Getting It Done: Learn about regular expressions, analysis and visualization, NumPy, storing data in files and HDF5, important data structures in physics, computing in parallel, and deploying software Getting It Right: Build pipelines and software, learn to use local and remote version control, and debug and test your code Getting It Out There: Document your code, process and publish your findings, and collaborate efficiently; dive into software licenses, ownership, and copyright procedures
Download or read book An Introductory Course of Particle Physics written by Palash B. Pal and published by Taylor & Francis. This book was released on 2014-07-29 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: For graduate students unfamiliar with particle physics, An Introductory Course of Particle Physics teaches the basic techniques and fundamental theories related to the subject. It gives students the competence to work out various properties of fundamental particles, such as scattering cross-section and lifetime. The book also gives a lucid summary of the main ideas involved. In giving students a taste of fundamental interactions among elementary particles, the author does not assume any prior knowledge of quantum field theory. He presents a brief introduction that supplies students with the necessary tools without seriously getting into the nitty-gritty of quantum field theory, and then explores advanced topics in detail. The book then discusses group theory, and in this case the author assumes that students are familiar with the basic definitions and properties of a group, and even SU(2) and its representations. With this foundation established, he goes on to discuss representations of continuous groups bigger than SU(2) in detail. The material is presented at a level that M.Sc. and Ph.D. students can understand, with exercises throughout the text at points at which performing the exercises would be most beneficial. Anyone teaching a one-semester course will probably have to choose from the topics covered, because this text also contains advanced material that might not be covered within a semester due to lack of time. Thus it provides the teaching tool with the flexibility to customize the course to suit your needs.
Download or read book Introduction to Elementary Particles written by David Jeffery Griffiths and published by HarperCollins Publishers. This book was released on 1987-01-01 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rising Above the Gathering Storm written by Institute of Medicine and published by National Academies Press. This book was released on 2007-03-08 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a world where advanced knowledge is widespread and low-cost labor is readily available, U.S. advantages in the marketplace and in science and technology have begun to erode. A comprehensive and coordinated federal effort is urgently needed to bolster U.S. competitiveness and pre-eminence in these areas. This congressionally requested report by a pre-eminent committee makes four recommendations along with 20 implementation actions that federal policy-makers should take to create high-quality jobs and focus new science and technology efforts on meeting the nation's needs, especially in the area of clean, affordable energy: 1) Increase America's talent pool by vastly improving K-12 mathematics and science education; 2) Sustain and strengthen the nation's commitment to long-term basic research; 3) Develop, recruit, and retain top students, scientists, and engineers from both the U.S. and abroad; and 4) Ensure that the United States is the premier place in the world for innovation. Some actions will involve changing existing laws, while others will require financial support that would come from reallocating existing budgets or increasing them. Rising Above the Gathering Storm will be of great interest to federal and state government agencies, educators and schools, public decision makers, research sponsors, regulatory analysts, and scholars.
Download or read book The Character of Physical Law written by Richard P Feynman and published by Penguin UK. This book was released on 2007-09-06 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of classic lectures, delivered in 1960 and recorded for the BBC. This is Feynman's unique take on the problems and puzzles that lie at the heart of physical theory - with Newton's Law of Gravitation; on whether time can ever go backwards; on maths as the supreme language of nature. Demonstrates Feynman's knack of finding the right everyday illustration to bring out the essence of a complicated principle - eg brilliant analogy between the law of conservation energy and the problem of drying yourself with wet towels. 'Feynman's style inspired a generation of scientists. This volume remains the best record I know of his exhilarating vision' - Paul Davies
Download or read book The Dancing Wu Li Masters written by Gary Zukav and published by Harper Collins. This book was released on 2009-10-06 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: “The most exciting intellectual adventure I've been on since reading Robert Pirsig’s Zen and the Art of Motorcycle Maintenance.” —Christopher Lehmann-Haupt, New York Times Gary Zukav’s timeless, humorous, New York Times bestselling masterpiece, The Dancing Wu Li Masters, is arguably the most widely acclaimed introduction to quantum physics ever written. Scientific American raves: “Zukav is such a skilled expositor, with such an amiable style, that it is hard to imagine a layman who would not find his book enjoyable and informative.” Accessible, edifying, and endlessly entertaining, The Dancing Wu Li Masters is back in a beautiful new edition—and the doors to the fascinating, dazzling, remarkable world of quantum physics are opened to all once again, no previous mathematical or technical expertise required.
Download or read book Helen of the Old House written by D. Appletion and Company and published by Wentworth Press. This book was released on 2019-03-13 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Statistical Mechanics written by James Sethna and published by OUP Oxford. This book was released on 2006-04-07 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: In each generation, scientists must redefine their fields: abstracting, simplifying and distilling the previous standard topics to make room for new advances and methods. Sethna's book takes this step for statistical mechanics - a field rooted in physics and chemistry whose ideas and methods are now central to information theory, complexity, and modern biology. Aimed at advanced undergraduates and early graduate students in all of these fields, Sethna limits his main presentation to the topics that future mathematicians and biologists, as well as physicists and chemists, will find fascinating and central to their work. The amazing breadth of the field is reflected in the author's large supply of carefully crafted exercises, each an introduction to a whole field of study: everything from chaos through information theory to life at the end of the universe.
Download or read book Astroparticle Physics written by Claus Grupen and published by Springer Nature. This book was released on 2020-01-27 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the branch of astronomy in which processes in the universe are investigated with experimental methods employed in particle-physics experiments. After a historical introduction the basics of elementary particles, Explains particle interactions and the relevant detection techniques, while modern aspects of astroparticle physics are described in a chapter on cosmology. Provides an orientation in the field of astroparticle physics that many beginners might seek and appreciate because the underlying physics fundamentals are presented with little mathematics, and the results are illustrated by many diagrams. Readers have a chance to enter this field of astronomy with a book that closes the gap between expert and popular level.
