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Excitation Of Nuclei By Antiproton Annihilation At Rest
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Book Synopsis Excitation of Nuclei by Antiproton Annihilation at Rest by :
Download or read book Excitation of Nuclei by Antiproton Annihilation at Rest written by and published by . This book was released on 1992 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research leading to the detailed characterization of antiproton annihilation in nuclei has resulted in three publications during the past year. We have reported on neutron yields and angular distributions from annihilation in uranium. This work is important to our SHIVA Star subcritical microfission measurements currently in progress at the Phillips Laboratory, Kirtland AFB. Proton spectra indicate the presence of multinucleon annihilation in carbon and uranium targets. This is important in determining the premission yield of nucleons in annihilation on uranium. The existence of rare hypernuclei formed in antiproton annihilation on uranium and bismuth has been observed. These states live a fraction of a nanosecond, and are of considerable interest to theorists trying to understand the binding of particles in heavy nuclei.
Book Synopsis A Measurement of Charged and Neutral Elementary Particles Emitted from Antiproton Annihilation at Rest in Heavy Nuclei by :
Download or read book A Measurement of Charged and Neutral Elementary Particles Emitted from Antiproton Annihilation at Rest in Heavy Nuclei written by and published by . This book was released on 1989 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first complete spectrum of neutrons from antiproton induced fission of Uranium has been obtained. Features of the spectrum are explained by three processes: emission of prompt ejectiles driven from the nucleus by pions in the intranuclear cascade, evaporation of neutrons from the excited nucleus before fission, and de-excitation of fission fragments. The temperature of the fission neutrons is about 67% higher than normal fission, indicating large residual energy deposited in the fission fragments. Hence, the fission process serves as a window into the excitation process itself. Results have also been obtained on gamma-rays associated with de-excitation of fission fragments after neutron emission. With respect to normal fission, the relative yield of gamma-rays to neutrons is suppressed, but the temperature of the gamma-rays is higher. Energy transfer by pi-zeros in the intranculear cascade initiated by antiproton annihilation at rest in carbon and uranium has been measured. The prospects for initiating multifragmentation and disintegration of heavy nuclei appear good.
Book Synopsis A Study of the Antiproton Annihilation Process in Complex Nuclei by : Theodore E. Kalogeropoulos
Download or read book A Study of the Antiproton Annihilation Process in Complex Nuclei written by Theodore E. Kalogeropoulos and published by . This book was released on 1959 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A STUDY OF THE ANTIPROTON ANNIHILATION PROCESS IN COMPLEX NUCLEI. by :
Download or read book A STUDY OF THE ANTIPROTON ANNIHILATION PROCESS IN COMPLEX NUCLEI. written by and published by . This book was released on 1959 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The antiproton annihilation process in complex nuclei was studied in photographic emulsions. When a 19.8 gr/ cm/sup 2/ LiH absorber was introduced in an existing antiproton beam, the antiproton-to-meson ratio improved by a factor of about 10, becoming 1/50,000. Thus in a single stack exposed to this improved beam, 165 antiprotons were found. These together with 20 more found in other stacks and the 36 reported in the Antiproton Collaboration Experiment'' (a total of 221 analyzed stars) are included in this analysi. From this analysis the annihilation process in complex nuclei can be interpreted to proceed as follows: The antiproton annihilates itself with one nucleon, transforming all the available energy mainly into The effects of mesons of average multiplicity 5.36 sintering time 0.28 with an occasional K-K emission of frequeney (3.5 sintering time 1.5%) per star. The mesons interact with the nucleus leaving it in an excited state. The nucleus releases the excitation energy through nucleon emission. On the average, the stars in flight have more excitation than those at rest. By the use of this experimental data and available information on pion interactions in nuclear matter, the fraction of interacting pions was deduced for the stars in flight and at rest separately. It is shown that with a better knowledge of the pion interactions in nuclear matter, antiproton annihilations can be used to investigate the nucleon distribution at the surface of the nucleus. The pion-pion angular distribution was deduced on the basis of energy-momentum conservation, by the use of the Fermi statistical model of the annihilation with Lorentz-invariant phase space. The theoretical distribution agrees with the experimental one if an adjustment of the interaction volume is made to account for the observed pion multiplicity. A strong pionpion interaction is thus unlikely. (auth).
Book Synopsis Neutron Yields and Angular Distributions Produced in Antiproton Annihilation at Rest in Uranium by :
Download or read book Neutron Yields and Angular Distributions Produced in Antiproton Annihilation at Rest in Uranium written by and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Energy Antiproton Physics - Proceedings Of The Third Biennial Confr Physics by : Gabrijel Kernel
Download or read book Low Energy Antiproton Physics - Proceedings Of The Third Biennial Confr Physics written by Gabrijel Kernel and published by World Scientific. This book was released on 1995-09-15 with total page 665 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings cover the latest results in low energy antiproton physics. The volume consists of invited talks and invited contributions on the following subjects: nucleon-antinucleon interactions, antiprotons in astrophysics, meson spectroscopy, strangeness and charm production, antinucleon-nucleus interactions, fundamental symmetries, antiproton facilities, atomic physics with antiprotons, antihydrogen-facilities and experiments.
Book Synopsis Annihilation of Antiprotons in Hydrogen at Rest III by : Charles Baltay
Download or read book Annihilation of Antiprotons in Hydrogen at Rest III written by Charles Baltay and published by . This book was released on 1965 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Antiproton Annihilation in Hydrogen at Rest I Reaction P + P - K + K + [pi] by : N. Barash
Download or read book Antiproton Annihilation in Hydrogen at Rest I Reaction P + P - K + K + [pi] written by N. Barash and published by . This book was released on 1965 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics of Atomic Nuclei written by and published by . This book was released on 1996 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annihilation of Antiprotons in Heavy Nuclei by : David L Morgan (Jr)
Download or read book Annihilation of Antiprotons in Heavy Nuclei written by David L Morgan (Jr) and published by . This book was released on 1986 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A literature survey was conducted to find information relevant to the annihilation of a low energy (sub MeV) antiproton in a heavy nucleus. Such information is important to the use of nuclear fragments from the annihilation to heat a working fluid for space propulsion. The particular piece of information desired was the fraction of annihilation energy that becomes the kinetic energy of charged nuclear fragments emitted after annihilation. The experimental and theoretical information located was sufficient to allow calculation of that energy fraction. Its value is about 10% for nuclei as heavy as silicon or greater and 20% for very heavy nuclei when the energy of fission fragments is included. Both values are less than a fraction of annihilation energy (38%) that becomes the kinetic energy of charged pions from the annihilation of an antiproton with a proton (hydrogen nucleus). These values are relevant to the choice of a working fluid that absorbs a portion of the annihilation energy and forms the exhaust for a rocket powered by antiproton annihilation. Althouth it is easier to couple the energy of charged nuclear fragments to the working fluid, the higher energy fraction for the charged pions makes hydrogen more attractive as the working fluid. It is therefore important to investigate possible means for efficient transfer of the pion energy to the working fluid.
Book Synopsis Annihilation of Antiprotons in Hydrogen at Rest II by : Charles Baltay
Download or read book Annihilation of Antiprotons in Hydrogen at Rest II written by Charles Baltay and published by . This book was released on 1965 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mesons And Nuclei At Intermediate Energies - Proceedings Of The International Conference by : Mikhail Kh Khankhasayev
Download or read book Mesons And Nuclei At Intermediate Energies - Proceedings Of The International Conference written by Mikhail Kh Khankhasayev and published by World Scientific. This book was released on 1995-02-17 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the main goals of intermediate energy nuclear physics, which serves an important role as a bridge between nuclear and particle physics, is to construct the theory of strong interaction phenomena in terms of conventional degrees of freedom (nucleons, deltas and mesons) as well as of quark degrees of freedom.The main topics to be discussed at this conference are the interaction of pions and other mesons with nuclei at intermediate energies and the role of mesonic degrees of freedom in nuclear reactions, including photon, hadron and heavy ion induced reactions. Both theoretical and experimental results will be included.Over the past two decades, the Meson Factories, including LAMPF, TRIUMF, and PSI, have provided us with systematic experimental information on hadron-hadron and hadron-nucleus dynamics. Major accelerators of JINR are also suitable for studying problems in Intermediate Energy Nuclear Physics. At the present time, first experiments have been performed with the proton beams at the Moscow Meson Factory of INR. One of the purposes of this conference is to introduce the intermediate-energy physics community to the possibility of utilizing the facilities of JINR and INR during the next decade.
Book Synopsis Antiproton-Nucleon and Antiproton-Nucleus Interactions by : F. Bradamante
Download or read book Antiproton-Nucleon and Antiproton-Nucleus Interactions written by F. Bradamante and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: The third course of the International School on Physics with Low Energy Antiprotons was held in Erice, Sicily at the Ettore Majorana Centre for Scientific Culture, from 10 to 18 June, 1988. The School is dedicated to physics accessible to experiments using low energy antiprotons, especially in view of operation of the LEAR facility at CERN with the upgraded antiproton source AAC (Antiproton Accumulator AA and Antiproton Collector ACOL). The first course in 1986 covered topics related to fundamental symmetries; the second course in 1987 focused on spectroscopy of light and heavy quarks. This book con tains the Proceedings of the third course, devoted to the experimental and theoretical aspects of the interaction of antinucleons with nucleons and nuclei. The Proceedings contain both the tutorial lectures and contributions presented by participants during the School. The papers are organized in several sections. The first section deals with the theoretical aspects of NN scattering and annihilation, and the underlying QCD. The experimental techniques and results concerning NN scattering are contained in Section II. Section III contains theoretical reviews and contributions on anti proton-nucleus scattering and bound states. Section IV is devoted to the experimental results on the antiproton nucleus systems and their phenomenological analysis. Finally, some possible developments of the antiproton machines are presented.
Book Synopsis Annihilation of Antiprotons in Hydrogen at Rest V by : Charles Baltay
Download or read book Annihilation of Antiprotons in Hydrogen at Rest V written by Charles Baltay and published by . This book was released on 1965 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Response of Nuclei under Extreme Conditions by : R.A. Broglia
Download or read book The Response of Nuclei under Extreme Conditions written by R.A. Broglia and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, a new field of nuclear research has been opened through the possibility of studying nuclei wi\h very large values of angular momentum, temperature, pressure and number of particles. This development has been closely associated with heavy ion reactions, since collisions between two heavy nuclei are especially effective in producing metastable compound systems with large angular momentum, and in transferring energy which is distributed over the whole nuclear volume. Under the strain of temperature and of the Coriolis and centrifugal forces, the nucleus displays structural changes which can be interpreted in terms of pairing and shape phase transit ions. This was the subject of the lectures of J. D. Garrett, P. J. Twin and S. Levit. While the rotational motion is, at zero temperature un damped, the width of giant resonances indicate that the nucleus only oscillates through few periods before the motion is damp ed by particle decay, and through coupling to the compound nucleus. Temperature and angular momentum influence in an im portant way the properties of both giant resonances and rotatio nal motion. These subjects were developed by K. Snover, and by P. F. Bortignon and R. A. Broglia, as well as by A. Bracco, A. Dellafiore and F. Matera.
Book Synopsis Low Energy Antiproton Physics - Proceedings Of The First Biennial Conference by : Per Carlson
Download or read book Low Energy Antiproton Physics - Proceedings Of The First Biennial Conference written by Per Carlson and published by World Scientific. This book was released on 1991-01-10 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of this important conference consist of plenary and invited papers published in hard copy and CD-ROM versions. The contributed oral and poster presentations are included in the CD-ROM version only.
Book Synopsis Antiproton Interactions in Hydrogen and Carbon Below 200 Mev by : Lewis E. Agnew (Jr.)
Download or read book Antiproton Interactions in Hydrogen and Carbon Below 200 Mev written by Lewis E. Agnew (Jr.) and published by . This book was released on 1959 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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