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Author : I. Navon
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (354 download)
Download or read book Pion Double Charge Exchange at 50 MeV on 14C written by I. Navon and published by . This book was released on 1983 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nigel Paul Hessey
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (66 download)
Download or read book The Pion Double Charge Exchange Reaction on 18O at 50 MeV written by Nigel Paul Hessey and published by . This book was released on 1985 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Pion Double Charge Exchange on Carbon-13, Carbon-14, Magnesium-26, and Iron-56 written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cross sections for the /sup 13,14/C, 26Mg, 56Fe(.pi., .pi.−)/sup 13,14/O, 26Si, 56Ni reactions were measured with the Energetic Pion Channel and Spectrometer at the Clinton P. Anderson Meson Physics Facility for 120 less than or equal to T/sub .pi./ less than or equal to 292 MeV and 0 less than or equal to theta less than or equal to 50. The double isobaric analog states (DIAS) are of primary interest. In addition, cross sections for transitions to 14O(0, 5.92 MeV), 14O(2+, 7.77 MeV), 56Ni(gs), 13O(gs), and 13O(4.21 MeV) are presented. The 13O(4.21 MeV) state is postulated to have J/sup .pi./ = 1/2−. The data are compared to previously measured double-charge-exchange cross sections on other nuclei, and the systematics of double charge exchange on T greater than or equal to 1 target nuclei leading to the DIAS are studied. Near the .delta.33 resonance, cross sections for the DIAS transitions are in disagreement with calculations in which the reaction is treated as sequential charge exchange through the free pion-nucleon amplitude, while for T/sub .pi./> 200 MeV the anomalous features of the 164 MeV data are not apparent. This is evidence for significant higher order contributions to the double-charge-exchange amplitude near the reasonable energy. Two theoretical approaches that include two nucleon processes are applied to the DIAS data. 64 references.
Author : William R Gibbs
Publisher : World Scientific
ISBN 13 : 9814611875
Total Pages : 622 pages
Book Rating : 4.8/5 (146 download)
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
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 1988 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. Data has been obtained for double-isobaric analog state (DIAS) transitions on 14C, 18O, 26Mg, and a number of nuclei in the f-7/2 shell including /sup 42,44,48/Ca, primarily at 35 and 50 MeV. Additional data for non-analog (ground state) transitions has also been obtained for 12C. These data are consistent with the two-amplitude theoretical models where the two amplitudes represent scattering through analog and through non-analog intermediate states. Calculations based on shell-model correlations explain the general trends of the data. Preliminary new data on the forward-angle energy dependence of the DIAS and g.s. transitions for /sup 42,44,48/Ca from 25 to 70 MeV is presented here and the current theoretical picture based upon this data is reviewed. 26 refs., 31 figs., 4 tabs.
Author : Daniel S. Koltun
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.3/5 (91 download)
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:
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Download or read book Pion Double-charge Exchange Across the (3,3) Pi-nucleon Resonance. [100 to 300 MeV, Preliminary Results]. written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pion double charge exchange reactions were studied across the (3,3) .pi.-nucleon resonance. The reactions16 180(.pi., .pi.−)16 18Ne and 24 26Mg(.pi., .pi.−)24 26Si were studied from 100 MeV to 300 MeV. Energy excitation functions of dsigma/d.cap omega. are reported for all targets. Also presented are angular distributions of dsigma/d.cap omega. for 180 and 26Mg. 13 references.
Author : Charles James Cook
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (175 download)
Download or read book Cross Section Measurements of Pion Double Charge Exchange on Vanadium at 31 MeV and Lithium at 30 MeV. written by Charles James Cook and published by . This book was released on 1968 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 586 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (727 download)
Download or read book Single- and Double-charge Exchange at Low Pion Energies written by and published by . This book was released on 1991 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is given of pion single- and double-charge exchange reactions at incident energies of 25 to 65 MeV leading to isobaric analog states, and in the case of double-charge exchange leading to the ground state of the residual nucleus. The crucial role of the higher nuclear transparency at low pion energies for the analysis of the data in terms of single and double scattering is demonstrated. The large effects on double-charge exchange produced by the spatial correlations in nuclear wave functions are evident. The data on 1f--2 nuclei at 35 MeV are used to establish the general validity of a shell-model-based two-amplitude model for these transitions. Recent measurements of the energy dependence between 25 and 65 MeV of double-charge exchange cross sections at forward angles are presented and discussed. 33 refs., 19 figs.
Author :
Publisher :
ISBN 13 :
Total Pages : 510 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M.N. Harakeh
Publisher : Springer Science & Business Media
ISBN 13 : 146841366X
Total Pages : 264 pages
Book Rating : 4.4/5 (684 download)
Download or read book Correlations and Clustering Phenomena in Subatomic Physics written by M.N. Harakeh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: In many areas of physics, such as astrophysics, solid-state physics, nuclear physics and particle physics, a major outstanding problem is a better understanding of corre lation phenomena. While in most cases the average properties of a system are rather well understood, the correlations and the resulting clustering are poorly understood. They are reflections of the force mediating the interaction among the constituents and play essential roles in determining the structure of a physical system. At the largest scales, in astrophysics, it has recently been realized that there are huge voids in space and almost all matter is concentrated on filaments, raising interesting questions concerning the origin of this clustering of matter. In nuclear physics corre lation phenomena are important in all its subfields. It has been realized that so-called fluctuations in the one-particle density, which are a manifestation of nucleon-nucleon correlations, are crucial. These are important for an understanding of heavy-ion reac tions. This is the subject of modern quantum transport theories. Correlations are also crucial in the description of the high momentum components as observed in quasi-elastic knock-out reactions.
Download or read book Pion Single- and Double-charge-exchange Reactions at Low Energies written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The general features of pion charge-exchange reactions at energies of 20 to 80 MeV leading to nuclear isobaric-analog states (IAS) and double-isobaric-analog states (DIAS) are reviewed. The recent progress achieved in understanding the role of short-range N-N correlations in the double-charge-exchange reactions is presented. 36 refs., 21 figs., 2 tabs.
Author : William R. Gibbs
Publisher :
ISBN 13 :
Total Pages : 626 pages
Book Rating : 4.:/5 (45 download)
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:
Author :
Publisher :
ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1971 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S Oneda
Publisher : World Scientific
ISBN 13 : 9814554782
Total Pages : 946 pages
Book Rating : 4.8/5 (145 download)
Download or read book Hadron '91 - Proceedings Of The International Conference written by S Oneda and published by World Scientific. This book was released on 1992-05-07 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume, the structure and reactions of radioactive nuclei are described. The relevance of halo nuclei to nuclear astrophysics is stressed in different contributions. Other topics included are: three-body aspects of light neutron-rich nuclei, elastic scattering, charge exchange and Coulomb excitation, fragment moment distribution, mass at half-life measurement and electromagnetism-induced fission.
Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (893 download)
Download or read book Pion Induced Double-charge Exchange Above the Resonance written by and published by . This book was released on 1989 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The zero degree excitation function for ([pi], [pi]−) is calculated for pion energies of 300 to 1400 MeV assuming a sequential mechanism. The cross section around 1225 MeV is 104 smaller than at 800 MeV. Experiments at this energy should be ideal for searches for effects due to exchange currents, and other non-conventional mechanisms. 15 refs.
