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Low Energy Pion Double Charge Exchange And Nucleon Nucleon Correlations In Nuclei
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Book Synopsis Low-energy Pion Double Charge Exchange and Nucleon-nucleon Correlations in Nuclei by :
Download or read book Low-energy Pion Double Charge Exchange and Nucleon-nucleon Correlations in Nuclei written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent measurements of pion double-charge exchange (DCX) at energies 20 to 70 MeV are providing a new means for studying nucleon-nucleon correlations in nuclei. At these energies the nucleus is relatively transparent, allowing simpler theoretical models to be used in interpreting the data and leading to a clearer picture. Also the contribution to DCX of sequential charge-exchange scattering through the intermediate analog state is suppressed near 50 MeV and transitions through non-analog intermediate states become very important. Recent theoretical studies by several groups have shown that while transitions through the analog route involve relatively long nucleon-nucleon distances, those through non-analog intermediate states obtain nearly half their strength from nucleon pairs with less than 1 fermi separation. Thus DCX near 50 MeV is an excellent way to study short-range nucleon-nucleon correlations. 31 refs., 29 figs., 4 tabs.
Book Synopsis Double Charge Exchange Scattering of Low Energy Pions by Nuclei by : Daniel S. Koltun
Download or read book Double Charge Exchange Scattering of Low Energy Pions by Nuclei written by Daniel S. Koltun and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nucleon-nucleon Correlations Detected Via Pion Double-charge-exchange Reactions by :
Download or read book Nucleon-nucleon Correlations Detected Via Pion Double-charge-exchange Reactions written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Double-charge-exchange reactions induced by pions are shown to furnish a direct means of detecting nucleon-nucleon correlations in nuclei. For the particular case of double isobaric analog transitions the effect of correlations is easily isolated and quite strong. Examination of the properties of the position correlations implicit in the nuclear shell model provides an explanation of several experimentally observed features of double-charge-exchange reactions, including in particular, their dependence on the number of valence neutrons present. An explicit demonstration of the role played by nucleon-nucleon correlations is presented for the double-charge-exchange cross-sections of 42Ca, 44Ca and 48Ca, recently measured at LAMPF. Our analysis explains why the cross section for the double-charge-exchange reaction on 48Ca, in which 28 neutron pairs participate, is comparable and indeed smaller than the corresponding cross-section for 42Ca with its single valence neutron pair. It also predicts the variation of angular distributions over the family of isotopes. 13 refs., 3 figs.
Book Synopsis Pion-nucleus Double Charge Exchange - 2nd Lampf Workshop by : William R Gibbs
Download or read book Pion-nucleus Double Charge Exchange - 2nd Lampf Workshop written by William R Gibbs and published by World Scientific. This book was released on 1990-09-24 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: What do you associate with chemistry? Explosions, innovative materials, plastics, pollution? The public's confused and contradictory conception of chemistry as basic science, industrial producer and polluter contributes to what we present in this book as chemistry's image as an impure science. Historically, chemistry has always been viewed as impure both in terms of its academic status and its role in transforming modern society. While exploring the history of this science we argue for a characteristic philosophical approach that distinguishes chemistry from physics. This reflection leads us to a philosophical stance that we characterise as operational realism. In this new expanded edition we delve deeper into the questions of properties and potentials that are so important for this philosophy that is based on the manipulation of matter rather than the construction of theories./a
Book Synopsis Probing Two-nucleon Correlations with Pion Double-charge Exchange by :
Download or read book Probing Two-nucleon Correlations with Pion Double-charge Exchange written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is given of pion double-charge exchange reactions at incident energies of 25 to 65 MeV and leading to nuclear isobaric- analog states and to ground states. The large effects on the cross-section magnitudes and angular distribution shapes produced by spatial correlations in nuclear wave functions are demonstrated. The data on 1f7/2 nuclei at 35 MeV obtained in the last few years are used to establish the general validity of the two-amplitude shell model description for these transitions. Recent measurements on the energy dependence between 20 and 65 MeV of forward-angle cross sections are presented and discussed. 19 refs., 15 figs., 2 tabs.
Book Synopsis Short-range NN and N. Delta. Correlations in Pion Double Charge Exchange (DCX). by :
Download or read book Short-range NN and N. Delta. Correlations in Pion Double Charge Exchange (DCX). written by and published by . This book was released on 1990 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: I will review several important results related to the short-range nucleon-nucleon and delta-nucleon interaction that have been obtained from recent studies of pion double charge exchange in selected nuclei. 32 refs., 5 figs., 3 tabs.
Book Synopsis Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange by : William R. Gibbs
Download or read book Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange written by William R. Gibbs and published by . This book was released on 1990 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reaction Mechanism and Nuclear Correlations Study by Low Energy Pion Double Charge Exchange by : Zeev Weinfeld
Download or read book Reaction Mechanism and Nuclear Correlations Study by Low Energy Pion Double Charge Exchange written by Zeev Weinfeld and published by . This book was released on 1993 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Studies of Nucleon-nucleon and Pion-nucleus Interactions at Intermediate Energies by :
Download or read book Experimental Studies of Nucleon-nucleon and Pion-nucleus Interactions at Intermediate Energies written by and published by . This book was released on 1990 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the work on experimental research in intermediate energy nuclear and particle physics carried out by New Mexico State University in 1988--91. Most of these studies have involved investigations of neutron-proton and pion-nucleus interactions. The neutron-proton research is part of a program of studies of interactions between polarized nucleons that we have been involved with for more than ten years. Its purpose has been to help complete the determination of the full set of ten complex nucleon-nucleon amplitudes at energies up to 800 MeV, as well as to continue investigating the possibility of the existence of dibaryon resonances. The give complex isospin-one amplitudes have been fairly well determined, partly as a result of this work. Our work in this period has involved measurements and analysis of data on elastic scattering and total cross sections for polarized neutrons on polarized protons. The pion-nucleus research continues our studies of this interaction in regions where it has not been well explored. One set of experiments includes studies of pion elastic and double-charge-exchange scattering at energies between 300 and 550 MeV, where our data is unique. Another involves elastic and single-charge-exchange scattering of pions from polarized nuclear targets, a new field of research which will give the first extensive set of information on spin-dependent pion-nucleus amplitudes. Still another involves the first set of detailed studies of the kinematic correlations among particles emitted following pion absorption in nuclei.
Book Synopsis Contributions of Pair Correlations to Pion-nucleus Double Charge Exchange by :
Download or read book Contributions of Pair Correlations to Pion-nucleus Double Charge Exchange written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recognizing the importance of both the reaction mechanism and nuclear structure aspects of the DCX, a new reaction theory was proposed in 1981 which offers a consistent treatment of these two equally important components of pion DCX. In this theory, the density square-dependent interaction is derived from the dynamical consideration of true pion absorption on a nucleon pair inside the nucleus. The strength of this new pion-nucleus interaction can then be calculated from the knowledge of the second-order pion-nucleus optical potential. With no free parameters for the pion-nucleus interaction and with the use of the coexistence nuclear model, the theory gives satisfactory descriptions of the magnitude and the shape of 5° excitation functions as well as of the differential cross sections for the DCX reactions 18O(.pi., .pi.−) 18Ne(DIAS) and 42Ca(.pi., .pi.−) 42Ti(DIAS) between 120 and 290 MeV. Our basic conclusions are: (1) the TSSCX mechanism alone cannot describe pion DCX; (2) the position of the first minimum in the differential cross section is very sensitive to the inclusion of density square-dependent interaction; and (3) on the other hand, the magnitude of the cross section is very sensitive to the inclusion of pair correlations (core excitation in the case with 18O and 42Ca).
Book Synopsis Nucleon Correlations in Nuclei by : A. N. Antonov
Download or read book Nucleon Correlations in Nuclei written by A. N. Antonov and published by Springer. This book was released on 1993 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pions In Nuclei - Proceedings Of The International Workshop by : M J Vicente-vacas
Download or read book Pions In Nuclei - Proceedings Of The International Workshop written by M J Vicente-vacas and published by World Scientific. This book was released on 1992-03-27 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings reflect the recent experimental and theoretical progress in pion nuclear physics in topics like pionic atoms, pion absorption, charge exchange, (π, 2π), and others involving pions in nuclei using different probes, as electron photons or heavy ions. Related topics on chiral symmetry, low energy πN and (γ, π⁰) and quark degrees of freedom are also addressed.
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 640 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.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AEC Authorizing Legislation, Fiscal Year 1968: General and physical research program, including proposed 200-BEV accelerator by : United States. Congress. Joint Committee on Atomic Energy
Download or read book AEC Authorizing Legislation, Fiscal Year 1968: General and physical research program, including proposed 200-BEV accelerator written by United States. Congress. Joint Committee on Atomic Energy and published by . This book was released on 1967 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AEC Authorizing Legislation by : United States. Congress. Joint Committee on Atomic Energy
Download or read book AEC Authorizing Legislation written by United States. Congress. Joint Committee on Atomic Energy and published by . This book was released on 1967 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
