Download or read book Relativistic Mean field Calculations of Lambda and Sigma Hypernuclei written by and published by . This book was released on 1992 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-particle spectra of [Lambda] and [Sigma] hypernuclei are calculated within a relativistic mean-field theory. The hyperon couplings used are compatible with the [Lambda] binding in saturated nuclear matter, neutron-star masses and experimental data on [Lambda] levels in hypernuclei. Special attention is devoted to the spin-orbit potential for the hyperons and the influence of the [rho]-meson field (isospin dependent interaction).

Download or read book Lambda And Sigma Hypernuclei written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present status of structure calculations for p-shell .lambda. hypernuclei, including the phenomenological determination of .lambda. N effective interaction matrix elements, is briefly reviewed. For .sigma. hypernuclei the Nijmegen potential model D is used for guidance in constructing .sigma. N effective interactions. The structure of /sub .sigma./12Be and /sub .sigma./12C, including isospin mixing in the later case, is discussed, and a comparison is made with experimental data. 19 refs., 5 figs., 4 tabs.

Download or read book Relativistic Description of lambda sigma and X Hypernuclei written by Jennings, B. K. (Byron Kent) and published by . This book was released on 1993 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Decay Modes of Sigma and Lambda Hypernuclei written by E. Oset and published by . This book was released on 1990 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Decay Modes of Sigma and Lambda Hypernuclei written by and published by . This book was released on 1990 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ab Initio Approach to sigma Shell Hypernuclei 3 Lambda H 4 Lambda H 4 Lambda He and 5 Lambda He with a Lambda Ny Sigma Ny Interaction written by H. Nemura and published by . This book was released on 2002 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Remarks on the S shell Lambda hypernuclei written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The complexities of the s-shell .lambda.-hypernuclei (A less than or equal to 5) are explored. Difficulties associated with attempts to describe the hyperon-nucleon (YN) interaction in all such .lambda.-hypernuclei by simple, effective .lambda.p and .lambda.n potentials are examined. The explicit A dependence of the effective YN interaction due to .lambda. N-.sigma. N coupling and isospin differences among the nuclear core states is investigated. The necessity of using exact four-body theory to calculate small charge-symmetry-breaking effects (in the A = 4 system) using .lambda. N potentials fitted to free .lambda. N scattering data is emphasized. Possible use of s-shell hypernuclear binding energies to help distinguish among candidate YN potential parameterizations is discussed.

Download or read book Lambda N Sigma N Coupling in S shell Lambda hypernuclei written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The inclusion of Lambda N-.sigma. N coupling in the A = 4 Lambda-hypernuclei is shown to be required in order to obtain proper ordering of the 0 ground state and 1 spin-flip excited state, when exact four-body equations are solved. It is argued that suppression of the off-diagonal Lambda N-.sigma. N coupling in the A = 5 system, similar to that in the A = 4 isodoublet, should account for the anomalously small binding of 5He. An alternative quark model explanation is also considered.

Download or read book THE STORY OF SIGMA HYPERNUCLEI A MODERN FABLE written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The reality of[Sigma] hypernuclei has been the subject of intense concern among experimenters and theoreticians for more than 20 years. The possible existence of[Sigma] hypernuclei was first suggested by a pioneering experiment on a[sup 9]Be target at the CERN PS. There were reported to be two narrow ([Gamma]8 MeV) peaks in the continuum region. This finding was quite unexpected since the widths of[Sigma] states were believed to be large due to the strong conversion process. It is obvious that if such relatively long-lived systems were confirmed unambiguously by experiment, their masses and widths provide important constraints on the[Sigma]N effective interaction and its relation to the[Lambda]N and NN interactions. Since the[Sigma] carries isospin, the role of isospin and isospin conservation in hadronic reactions could be explored. This report stimulated a number of subsequent experiments at the BNL-AGS and KEK, along with further experiments with a specially created short kaon beam at the CERN PS. Experimental data were reported for different targets at different momenta and at different conditions. Various tagging techniques were employed to suppress backgrounds, but always at the expense of a reduction in statistical quality. Because of problems with resolution and statistics, contradictions among the different sets of data resulted more often in clouding the issues than clarifying them. Thus, up until a few years ago, there was no statistically clear confirmation of this surprising finding. In the last few years, however, a series of definitive experiments has been performed at the BNL-AGS in an effort to resolve the discrepancies and settle the controversy. Besides repeating the initial experiment on Be, a target of[sup 6]Li was run. The earlier stopped kaon data on[sup 4]He was repeated in an in-flight experiment, and the suggestion of a[Sigma] bound state, with virtually pure isospin, confirmed. We now have a better understanding of the role of isospin in the nucleon-hyperon interaction and the importance of three body forces in hyper-nuclei. According to that understanding, it is unlikely that[Sigma] states for A 5 will ever be seen. In this review, a critique of the past BNL experiments is presented and conclusions on the status of the[Sigma] database drawn.

Download or read book Physics of Few body Lambda Hypernuclei written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The energies of the particle-stable states in few-body .lambda. hypernuclei are summarized. Other topics reviewed include: the role of the hypertriton in determining the spin dependence of the .lambda. N force, the role of the hypertriton in three-body force investigations, the effect of medium modifications upon .lambda. N-.sigma. N coupling in the .lambda.-4 isodoublet and the spin dependence of the .lambda. N force, the importance of exact equation formalisms in interpreting precision data, and the need for a renewed effort to identify and measure the masses of .lambda lambda. hyperfragments. 40 refs., 4 figs., 3 tabs.

Download or read book Systematics of the The Sigma Sigma And Sigma Hypernuclear Single Particle States written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Local density dependent Hartree-Fock potentials in analogy with the .lambda.° hypernuclear single particle state description by Millener, Dover and Gal were employed to investigate the systematics of the .sigma. hypernuclear single particle states. Both charge and isospin dependent (Lane potential) one-body potentials were used to describe the .sigma.−, .sigma.° and .sigma. single particle (s.p.) states for .sigma. hypernuclei in the mass range 6-40 with core-nucleus isospin T/sub c/ = 1/2. Due to the smaller magnitude of the .sigma.-nucleus potential the coulomb effects are dominant, especially for nuclei towards A = 40, while the isospin dependent potential has strong effect for the lighter nuclei due to the A−1 dependence of the Lane potential. 11 refs., 1 fig., 1 tab.

Download or read book Suppression of the Lambda Sigma Coupling in Nuclear Matter written by and published by . This book was released on 1995 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: We initiated a study of the modification of the coupling of the [Lambda]N to the [Sigma]N channel in nuclear matter with the Fermi hypernetted-chain variational approach. This modification of the [Lambda]N-[Sigma]N coupling is a central problem in hypernuclear physics and is related closely to the strongly repulsive three-body forces which are needed to account for hypernuclear binding energies. All earlier calculations have only considered this problem in the so-called G-matrix approximation which neglects important higher-order effects. An important result of this work will be a better understanding of the density dependence of [Lambda] binding in nuclear matter, which can then be tested in the calculation of the [Lambda] single-particle energies.

Download or read book Common Problems And Trends Of Modern Physics Proceedings Of The Vii Winter School On Hadronic Physics written by T Bressani and published by World Scientific. This book was released on 1993-02-27 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers in this proceedings present the major open problems in Hadronic Physics in the confinement region and discuss which experimental approaches seem to be the most adequate in the near future. Specific items discussed in detail are meson spectroscopy and kaon physics.

Download or read book Strangeness Exchange Reactions and Hypernuclei written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent progress in the spectroscopy of .lambda. and .sigma. hypernuclei is reviewed. Prospects for the production of doubly strange hypernuclei at a future kaon factory are assessed. It is suggested that the (K−, K) reaction on a nuclear target may afford an optimal way of producing the H dibaryon, a stable six quark object with J/sup .pi./ = O, S = -2.

Download or read book Experimental Hypernuclear Physics written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experimental results from the study of .lambda.- and .sigma.-hypernuclei through the (K−, .pi./sup + -/) reaction are reviewed. New experiments which are just beginning or being actively prepared are also discussed. In addition, an outlook is given at possible first experiments that could utilize the much higher fluxes of a kaon-factory.

Download or read book Issues in Nuclear High Energy Plasma Particle and Condensed Matter Physics 2013 Edition written by and published by ScholarlyEditions. This book was released on 2013-05-01 with total page 1163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about High Energy Physics. The editors have built Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about High Energy Physics in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Download or read book Nuclear Physics written by Division on Engineering and Physical Sciences and published by National Academies Press. This book was released on 1986-02-01 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: