23 research outputs found

    Landau Migdal Theory of Interacting Fermi Systems: A Framework for Effective Theories in Nuclear Structure Physics

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    We review Migdal's Theory of Finite Fermi Systems and its application to the structure of nuclei. The theory is an extension of Landau's Theory of Interacting Fermi Systems. In the first part the basic formulas are derived within the many body Green functions approach. The theory is applied to isovector electric giant resonances in medium and heavy mass nuclei. The parameterizations of the enormalized effective ph-interaction and the effective operators are discussed. It is shown that the number of free parameters are restricted due to conservation laws. We also present an extension of Migdal's theory, where the low-lying phonons are considered in a consistent manner. The extended theory is again applied to the same isovector electric giant resonances and to the analysis of (╬▒,╬▒ÔÇ▓)(\alpha,\alpha^\prime) reaction data. We point out that the extended theory is the appropriate frame for self consistent nuclear structure calculations starting from effective Lagrangians and Hamiltonians.Comment: 6 figure

    Current log-periodic view on future world market development

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    Applicability of the concept of financial log-periodicity is discussed and encouragingly verified for various phases of the world stock markets development in the period 2000-2010. In particular, a speculative forecasting scenario designed in the end of 2004, that properly predicted the world stock market increases in 2007, is updated by setting some more precise constraints on the time of duration of the present long-term equity market bullish phase. A termination of this phase is evaluated to occur in around November 2009. In particular, on the way towards this dead-line, a Spring-Summer 2008 increase is expected. On the precious metals market a forthcoming critical time signal is detected at the turn of March/April 2008 which marks a tendency for at least a serious correction to begin. In the present extended version some predictions for the future oil price are incorporated. In particular a serious correction on this market is expected to start in the coming days.Comment: presented by S. Drozdz at FENS2007 conference, 10 pages, 6 Figs, an extended version with the oil market included (Fig.7

    Splitting and structure of the giant quadrupole resonances in deformed nuclei

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    We have performed microscopic calculations of the low-lying and high-lying K¤Ç=0+, 1+, and 2+ states in deformed rare-earth nuclei. The centroids of the isoscalar giant quadrupole resonance in 160Dy, 170Yb, and 184W are at 11.58, 11.44, and 11.22 MeV, respectively. A broadening of these resonances due to the deformation is predicted which varies appreciably in the different nuclei. About 20% of the monopole strength is found in the same energy range

    Magnetic dipole strength functions in heavy deformed nuclei

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    The isovector spin-flip M1 strength function in the deformed heavy nuclei 156Gd and 238U is calculated in the quasiparticle random-phase approximation. Interaction parameters are adjusted to reproduce the energies of isobaric-analog and Gamow-Teller excitations observed in (p,n) charge-exchange reactions. A phenomenological spreading width for decay into background 2p2h states is introduced and adjusted to reproduce the M1 spin-flip strength function recently observed by elastic scattering of tagged photons on 90Zr and 208Pb. With the model parameters fixed in this fashion, our calculations predict large quantities of spin-flip M1 strength (10ÔÇô20 ┬Á2N) between 5 and 10 MeV excitation in 156Gd and 238U; it is strongly fragmented and should be observable by tagged-photon elastic scattering and proton inelastic scattering but probably not in high resolution inelastic electron scattering

    Annual report / Institut f├╝r Kernphysik / COSY.

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    This year's report has undergone the biggest layout change since the institute began to document its annual activities in English in the year 1971. The advances in electronic data technology have been so dramatic, the ubiquity of PCs so overwhelming, and the advantages so compelling that the decision was no longer postponed to adopt a new layout that combines the best of both worlds in the form of a booklet together with a CD-ROM. The booklet presents selected contributions in the form of concise articles and highlights prominent activities. Additionally, it contains a compilation of key data of the institute. The accompanying CD-ROM allows off-line access to all articles and gives more detailed information. Of course, wherever you are, you have access to this information via the world wide web too under the URL http://www.fz-juelich.de/ikp/de/publications.shtml. The accomplishments summarized in the Annual Report would not have been possible without the dedication of our technicians, engineers, scientists, the IKP service groups, the colleagues of the infrastructure of the Forschungszentrum J├╝lich, and the students that have advanced the scientific frontier with their diploma- and PhD-theses. The amicable and spirited collaboration with CANU and the outside users is gratefully acknowledged. This kind of environment has been a key element for our common success. We also like to express our gratitude for the advice and help we have obtained by our advisory committees and for the commitment of the board of directors for COSY. But we cannot omit to mention the dark shadows that have appeared at the very end of the year 2002. Up to this time the scientific progress was compelling and the prospects were bright with a new injector for COSY underway that would have boosted polarized ion intensities tenfold. But unforeseeable and unprecedented budget cuts from the federal government that came like a bolt out of the blue left the board of directors with no other choice but to suspend the ongoing construction of the super conducting linac. We all have, of course, been deeply disappointed by this setback and are now in the process to work out the best solutions for the future that lies ahead. Our dedication and our commitment are strong and undiminished and we are confident that with the support of our scientific community we will succeed


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    International Meeting on Physics at KAON

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    "Physics at KAON", an international meeting jointly organized by the KFA Jillich and TRI┬ş UMF, was held in the Physikzentrum Bad Honnef from June 7 through June 9, 1989. This was one of a series of meetings - the first one in Europe - in which plans for the medium energy physics laboratory KAON were presented and some aspects of the physics at this new facility were discussed. The meeting focussed mainly on the topics of hadron spectroscopy, J{ -meson scattering, strangeness in nuclei, and rare decays. Also presented were some of the research programs at SATURNE and COSY which may well lead to KAON physics in the future. These proceed┬ş ings include articles which summarize our current experimental and theoretical knowledge in the various areas, as well as papers which describe lines of research feasible with KAON. The large number of participants - limited, in fact, by the capacity of the Physikzentrum - clearly demonstrates the great interest of the European physics community in the research avenues which will be opened by the high-intensity hadron facilities. March 1990 D. Frekers, D.R. Gill, J. Speth Contents Opening remarks By E. Vogt ...................................................... Sl The TRIUMF kaon factory accelerators By M.K. Craddock ................................................ S3 Experimental facilities By P. Kitching ................................................... S9 Polarized internal targets at KAON By C.A. Miller ................................................... S21 Hyperons in the bound state approach to the Skyrme model

    Contemporary topics in medium energy physics

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