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AbstractAbstract
[en] The nuclear fluid-dynamical Hamiltonian which takes the distortion of the local Fermi surface into account predicts the Twist mode (T = 0, J = 2-) at a finite frequency (about 7.5 MeV for 208Pb). (orig.)
[de]
Der nukleare fluiddynamische Hamiltonian, der die Verzerrung der lokalen Fermiflaeche beruecksichtigt, sagt eine Twistmode (T = 0, J = 2-) bei einer finiten Frequenz (ca. 7,5 MeV fuer 208Pb) vorher. (orig.)Primary Subject
Source
2 refs.
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Journal Article
Journal
Z. Phys., A; v. 283(2); p. 219-220
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AbstractAbstract
[en] The relaxation kinetic equation, describing the behavior of the Fermi gases, is derived. The Kramers semi-spatial task on the isothermal slip is considered. Its analytical solution is established and the function of distributing the particles, flying to the wall, is obtained in an obvious form. The analysis of the dependence of the equation itself and the slip rate on the value of the parameter, representing the ratio of the chemical potential to the product of the Boltzmann constant by the absolute temperature, is carried out
[ru]
Выведено релаксационное кинетическое уравнение, описывающее поведение ферми-газов. Рассматривается полупространственная задача Крамерса об изотермическом скольжении. Найдено ее аналитическое решение, и в явном виде получена функция распределения летящих к стенке частиц. Проведен анализ зависимости самого уравнения и скорости скольжения от величины параметра, представляющего собой отношение химического потенциала к произведению постоянной Больцмана на абсолютную температуруOriginal Title
Granichnye zadachi dlya kvantovogo fermi-gaza
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Source
11 refs., 1 fig.
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AbstractAbstract
[en] By means of the Fermi-liquid approach, the effects of exchange and correlations are considered in a layered two-dimensional electron gas. A graphical derivative technique is introduced to obtain the contributions to the interparticle interactions from different channels. It is shown that the interaction in the particle-hole channel can induce the metal-insulator phase transition when the Fermi momentum is comparable with the inverse interlayer spacing, pF approx. 1/c . It is also shown that the Cooper-like scattering processes give rise to the scaling of the Fermi liquid response as Im χ ∼ -ω/T, which leads to the linear temperature dependence of the quasiparticle damping. The possibility of superconductivity in the region between the insulator and normal metal phases, accounting for the particle-hole excitations, is discussed. The effect of the spin fluctuations on the superconductivity due to the particle-hole excitations is also considered. (author)
Primary Subject
Secondary Subject
Source
Available online at the Web site for the journal Superconductor Science and Technology (ISSN 1361-6668) http://www.iop.org/; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Superconductor Science and Technology; ISSN 0953-2048;
; v. 9(8); p. 622-638

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External URLExternal URL
AbstractAbstract
[en] Nuclear caloric curves have been analyzed using an expanding Fermi gas hypothesis to extract average nuclear densities. In this approach the observed flattening of the caloric curves reflects progressively increasing expansion with increasing excitation energy. This expansion results in a corresponding decrease in the density and Fermi energy of the excited system. For nuclei of medium to heavy mass apparent densities ∼0.4ρ0 are reached at the higher excitation energies
Primary Subject
Source
(c) 2002 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] A recent set of nuclear level density parameters obtained for the constant temperature (CT) and back-shifted Fermi gas (BSFG) model is reviewed. Very simple correlations are observed between the parameters T of CT, and a of BSFG, and between E0 of CT and E1 of BSFG. The average behavior of the level density parameter a with mass number is found to be a∼A0.90
Primary Subject
Source
(c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Uehlinger, T.; Strohmaier, N.; Greif, D.; Joerdens, R.; Tarruell, L.; Moritz, H.; Esslinger, T.
Joint annual meeting of the Austrian physical society, Swiss physical society, Austrian society of astronomy and astrophysics in Innsbruck. Bulletin SPG / SSP Vol 26, 2009; OEPG Tagungsband Nr. 592009
Joint annual meeting of the Austrian physical society, Swiss physical society, Austrian society of astronomy and astrophysics in Innsbruck. Bulletin SPG / SSP Vol 26, 2009; OEPG Tagungsband Nr. 592009
AbstractAbstract
[en] Full text: The investigation of interacting quantum ensembles in non-equilibrium is receiving a lot of attention, yet the theoretical understanding of experimental results often remains challenging due to the complexity of the systems and their coupling to the environment. In contrast, ultracold atoms in optical lattices offer a unique cleanliness and tunability of parameters. They are therefore well suited for the study of both equilibrium and non-equilibrium states in strongly correlated systems. We implement the Fermi-Hubbard model by trapping a repulsively interacting two-component Fermi gas in a three dimensional optical lattice. This model encompasses intriguing quantum phases near the Mott insulator and may even hold the key to understanding high-temperature superconductivity. The relaxation of highly excited states of our system, which are doubly occupied lattice sites (doublons), is investigated. After creating additional doublons by lattice modulation, we monitor the subsequent relaxation of the system over time. In units of the tunneling time, the measured doublon lifetime is found to depend exponentially on the ratio of on-site interaction energy to kinetic energy. We argue that the dominant mechanism for the relaxation is a high order scattering process. (author)
Primary Subject
Source
Briegel, H. (Physics Department of the University of Innsbruck, Innsbruck (Austria)); Gornik, E. (Austrian Physical Society (Austria)); Rossel, C. (Swiss Physical Society (Switzerland)); Schindler, S. (Austrian Society of Astronomy and Astrophysics (Austria)) (eds.); Oesterreichische Physikalische Gesellschaft (Austria); Swiss Physical Society (Switzerland); Oesterreichische Gesellschaft fuer Astronomie und Astrophysik (Austria). Funding organisation: Federal Ministry for Science and Research (Austria); Federal Ministry for Traffic, Innovation and Technology (Austria); Province of the Tyrol (Austria); City of Innsbruck (Austria); University of Innsbruck (Austria); Swiss Academy of Sciences (Switzerland); Swiss Academy of Engineering Sciences (Switzerland); 254 p; 2009; p. 40; Joint annual meeting of the Austrian physical society, Swiss physical society, Austrian society of astronomy and astrophysics; Gemeinsame Jahrestagung der Oesterreichischen Physikalischen Gesellschaft, der Schweizer Physikalischen Gesellschaft, der Oesterreichischen Gesellschaft fuer Astronomie und Astrophysik; Innsbruck (Austria); 2-4 Sep 2009; Available in abstract form only, full text entered in this record. Available from: http://oepg2009.uibk.ac.at/
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Miscellaneous
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AbstractAbstract
[en] A statistical method for calculating the hydrogen bond energy in metals is proposed. Within the framework of the electron Fermi-gas model an analytical expression is obtained for the average energy of hydrogen in metals of the Periodic Table of the Elements (Cu, Ag, Au, Zn, Cd, Hg, Al, Ga, In, Tl, Sn, Pb) as a function of the microscopic parameters of the metal. The hydrogen-metal bond energies calculated in accordance with the proposed theory are in good correlation with the experimental values
Original Title
Ehnergiya svyazi/ vodoroda v metallakh
Primary Subject
Source
For English translation see the journal Sov. Electrochem.
Record Type
Journal Article
Journal
Ehlektrokhimiya; v. 13(7); p. 995-1000
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AbstractAbstract
No abstract available
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Source
Available from http://dx.doi.org/10.1070/PU2008v051n06ABEH006548; Abstract only; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Physics Uspekhi; ISSN 1063-7869;
; v. 51(6); p. 603-608

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Carlson, B.V.; Nemes, M.C.; Toledo Piza, A.F.R. de
Proceedings of the 7. Workshop on Nuclear Physics1984
Proceedings of the 7. Workshop on Nuclear Physics1984
AbstractAbstract
No abstract available
Original Title
Dinamica de correlacoes num gas de Fermi degenerado
Primary Subject
Source
Sociedade Brasileira de Fisica, Rio de Janeiro; 277 p; 1984; p. 199; 7. Workshop on Nuclear Physics; Itatiaia, RJ (Brazil); 1-5 Sep 1984; Published in summary form only.
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Miscellaneous
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AbstractAbstract
[en] The superscaling observed in inclusive electron scattering is described within the dilute Fermi gas model with interaction between the particles. The comparison with the relativistic Fermi gas (RFG) model without interaction shows an improvement in the explanation of the scaling function f(ψ"') in the region ψ"' < −1, where the RFG result is f(ψ"') = 0. It is found that the behavior of f(ψ"') for ψ"' < −1 depends on the particular form of the general power-law asymptotics of the momentum distribution n(k) ∼ 1/k"4"+"m at large k. The best agreement with the empirical scaling function is found for m ≅ 4.5 in agreement with the asymptotics of n(k) in the coherent density fluctuation model where m = 4, the latter model being applied successfully to describe the superscaling phenomenon. Thus, superscaling gives information about the asymptotics of n(k) and the NN forces.
Primary Subject
Source
IWNT-26: 26. International Workshop on Nuclear Theory; Rila Mountains (Bulgaria); 25-30 Jun 2007; Available from Bulgarian INIS Center; 5 figs., 52 refs.
Record Type
Journal Article
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Conference
Journal
Nuclear Theory; ISSN 1313-2822;
; v. 26(2007); p. 59-69

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