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AbstractAbstract
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Original Title
Trajectoires complexes et approximation semi-classique
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Source
Colloquium on nuclear surface; Dijon, France; 30 Jun 1975; Published in summary form only.
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Journal Article
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Conference
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J. Phys. (Paris), Colloq; (no.5); p. C5.116
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Gillespie, J.
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1976
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1976
AbstractAbstract
[en] Models for hadron-nucleus scattering at intermediate and high energies are shown to depend sensitively on the mutual compatibility of the basic approximations such as non-local interactions, fixed scatterers, and eikonal amplitudes
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1976; 11 p; 7. Meeting of the Theoretical Physics Division; Meribel-les-Allues, France; 15 Mar 1976
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AbstractAbstract
[en] In this note we want to remedy the situation by providing a simple and systematic generalization of the eikonal equation as a general means to study high-energy scattering. (Author)
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Journal Article
Journal
Journal of the Korean Physical Society; ISSN 0374-4884;
; v. 17(4); p. 308-315

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Lambruschini, C.L.P.
International Centre for Theoretical Physics, Trieste (Italy)1991
International Centre for Theoretical Physics, Trieste (Italy)1991
AbstractAbstract
[en] A model for multilevel superfluorescence is presented. By using a parametric solution of this model we explain basic features in the two-color solid-state superfluorescence experiments of Florian, Schwan and Schmid. (author). 23 refs
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Source
May 1991; 16 p
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Report
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Brantley, P.S.; Tomasevic, D.I.
SFEN, 75 - Paris (France)2005
SFEN, 75 - Paris (France)2005
AbstractAbstract
[en] The simplified P2 (SP2) angular approximation typically produces more accurate reaction rates and eigenvalues than the P1 (diffusion) approximation for problems in which the P1 approximation is reasonably accurate. The SP2 scalar flux spatial distributions are also often more accurate than the P1 distributions away from material interfaces and source discontinuities. However, the SP2 scalar flux is spatially discontinuous at material interfaces and source discontinuities. These spatial discontinuities are unphysical, aesthetically displeasing, and can lead to large inaccuracies near interfaces. The scalar flux discontinuities in the planar geometry P2 approximation have recently been eliminated by combining the P2 approximation with the P1 approximation. In essence, the P1 angular approximation is used at material interfaces and source discontinuities to obtain spatially continuous scalar flux distributions; the P2 angular approximation is utilized elsewhere to take advantage of its improved accuracy. In this paper, we generalize this planar geometry approach to the multidimensional SP2 approximation. Numerical results from two-dimensional fixed-source and eigenvalue problems demonstrate the effectiveness of the technique. (authors)
Primary Subject
Source
2005; 10 p; SFEN; Paris (France); M and C 2005: international topical meeting on mathematics and computation, supercomputing, reactor physics and nuclear and biological applications; Avignon (France); 12-15 Sep 2005; Available from SFEN, 5 rue des Morillons, 75015 - Paris (France); 9 refs.
Record Type
Miscellaneous
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Rodriguez, V.D.; Miraglia, J.E.
Proceedings of the 2. Latin American Meeting on Atomic, Molecular and Electronic Collisions1988
Proceedings of the 2. Latin American Meeting on Atomic, Molecular and Electronic Collisions1988
AbstractAbstract
[en] Theoretical calculations for excitation of hydrogen-like atoms by ion impact at high and intermediate energies, are presented. Impulsive and eikonal wave functions are employed, both normalized. It is studied the dependence on energy and projectil charge (saturation) of cross sections, compared to experimental results. (A.C.A.S.)
[pt]
Apresentam-se os calculos teoricos da excitacao de atomos hidrogenados por impacto de ions em energia alta e intermediaria. As funcoes de onda empregadas sao uma funcao de onda impulsiva e eiconal, ambas normalizadas. Estuda-se a dependencia da energia e a carga do projetil nas secoes de choques comparando com os resultados experimentais. (C.G.C.)Original Title
Excitacion electronica en colisiones ion atomo
Primary Subject
Source
Montenegro, E.C.; Pinho, A.G. de; Souza, G.G.B. de.; Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil). Dept. de Fisica; Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil). Dept. de Quimica; 167 p; 1988; p. 154-155; 2. Latin American Meeting on Atomic, Molecular and Electronic Collisions; Caxambu, MG (Brazil); 25-30 Sep 1988
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Miscellaneous
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Brown, W.D.
Sandia Labs., Albuquerque, N.Mex. (USA)1974
Sandia Labs., Albuquerque, N.Mex. (USA)1974
AbstractAbstract
No abstract available
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May 1974; 20 p
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Report
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Gosselin, Pierre; Mohrbach, Herve, E-mail: mohrbach@univ-metz.fr2010
AbstractAbstract
[en] We investigate the origin of quantum geometric phases, gauge fields and forces beyond the adiabatic regime. In particular, we extend the notions of geometric magnetic and electric forces discovered in studies of the Born-Oppenheimer approximation to arbitrary quantum systems described by matrix-valued quantum Hamiltonians. The results are illustrated by several physical relevant examples.
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Source
Conference on 50 years of the Aharonov-Bohm Effect; Tel Aviv (Israel); 11-14 Oct 2009; Conference on Aharonov-Bohm Effect and Berry Phase 50/25 anniversary; Bristol (United Kingdom); 14-15 Dec 2009; S1751-8113(10)47478-8; Available from http://dx.doi.org/10.1088/1751-8113/43/35/354025; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Journal of Physics. A, Mathematical and Theoretical (Online); ISSN 1751-8121;
; v. 43(35); [11 p.]

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AbstractAbstract
[en] Penetrability through a three-humped barrier has been calculated in quasi-classical approximation and a plausible explanation of sub-barrier fission characteristics of thorium is suggested. (Auth.)
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Journal Article
Journal
Nuclear Physics. A; v. 256(2); p. 271-276
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AbstractAbstract
[en] We consider the use of quasi-diabatic bases to improve upon the Born-Oppenheimer approximation in molecular systems. In a nonrigorous, but still suggestive, manner, it is shown that, when the quasi-diabatic approximation is a good one, the use of 'frozen' electronic states will often be equally good, or nearly so.
Primary Subject
Source
21. international symposium on the Jahn-Teller effect; Tsukuba (Japan); 26-31 Aug 2012; Available from http://dx.doi.org/10.1088/1742-6596/428/1/012009; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 428(1); [4 p.]

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