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1986; 1 p; Workshop 'Towards 4π physics'; Grenoble (France); 16-18 Dec 1985; Published in summary form only.
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[en] This course reviews the theory of geometrical models of cluster formation in nuclear reactions. After an elementary introduction to the theory of critical phenomena, illustrated by percolation models, we discuss kinetic theories of aggregation and fragmentation. The realization of these ideas in the context of nuclear fragmentation reactions and the search of signals of phase transitions is also reviewed
[fr]
Ce cours fait une revue de la theorie des modeles de formation d'amas geometriques en physique des reactions nucleaires. Apres une introduction elementaire a la theorie des phenomenes critiques, illustree par les modeles de percolation, on discute de modeles cinetiques d'agregation et de fragmentation. L'application de ces idees a la physique des reactions nucleaires de fragmentation et a la recherche de signaux de transitions de phase est discutee en dernierOriginal Title
Introduction a la theorie des modeles de formations d'amas. Application a la fragmentation des noyaux
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1987; 48 p
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1986; 1 p; Published in summary form only.
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[en] In recent years the study of cluster formation has become a new field in statistical physics. Nuclear reactions with particle number change can be viewed as a cluster formation processes. Multifragmentation decay produces a power law distribution of medium size clusters. These two cluster size distributions resemble that of many others statistical cluster formation processes. We discuss now these analogies in some details
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Jan 1987; 9 p; 25. International Winter Meeting on Nuclear Physics; Bormio (Italy); 19-24 Jan 1987
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[en] We show that nuclei break up like finite systems that exhibit a clean phase transition in infinite size. This is done by studying conditional moments of the fragment multiplicities, the largest fragment size produced by event and its fluctuations. The nature of this smooth phase transition cannot be determined from the available experimental data. The ''critical point'' is reached when the energy deposited in the nucleus is 90% of its binding energy
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1987; 7 p; Symposium on hot nuclei; College Station, Tx (USA); 7-10 Dec 1987
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AbstractAbstract
[en] Different methods of obtaining information about nuclear charge distributions from muonic atom measurements are discussed. The nuclear polarization correction is also considered and a calculation based on the Hartree-Fock approximation is reviewed
[fr]
On etudie differentes methodes pour extraire des donnees experimentales des atomes muoniques une information sur le densite de charge nucleaire. On considere egalement la correction de polarisation nucleaire et on decrit une methode pour la calculer basee sur l'approximation de Hartree-FockOriginal Title
Atomes muoniques
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1975; 20 p; Congress of the French Physical Society; Dijon, France; 30 Jun 1975
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[en] We review some recent results on fragmentation theory. We discuss the statistics of various geometric constructions and those of kinetic equations of fragmentation
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1988; 6 p; 2. International Workshop on MeV and Kev Ion and cluster Interactions with Surfaces and Materials; Orsay (France); Sep 1988
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[en] We discuss the existence of finite size scaling in nuclear fragmentation. Analyzing experimental data on high energy proton induced reactions on targets of various sizes we show finite size scaling in the production of intermediate mass fragments and we determine the empirical value of a ''fractal dimension'' which may give information on the internal structure of the fragments during the fragmentation process
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1988; 8 p; International Workshop on Nuclear Dynamics at Medium and High Energies; Bad Honnef (Germany, F.R.); 10-14 Oct 1988
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AbstractAbstract
[en] The principle characteristics of Hartree-Fock charge densities (mean square radius, surface thickness, quantum fluctuation) calculated using different effective interactions are discussed in terms of their nuclear matter properties (Fermi momentum, effective mass, incompressibility). A comparison with the experimental charge distributions is made. Differences between the charge densities of neighbouring nuclei (isotope and isotone shifts) are also considered and the main factors governing these effects are discussed
[fr]
Les caracteristiques principales des densites de charge (rayon quadratique moyen, epaisseur de surface, fluctuations quantiques) calculees par la methode de Hartree-Fock utilisant differentes interactions, sont discutees suivant leurs proprietes dans la matiere nucleaire (moment de Fermi, masse effective, incompressibilite). Les densites de charge calculees sont comparees aux densites experimentales. On considere egalement les differences de densite de charge entre noyaux voisins (deplacements isotopiques et isotoniques) et on discute les facteurs qui regissent ces effetsPrimary Subject
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1975; 24 p; Conference on Hartree-Fock and self-consistent field theories in nuclei; Trieste, Italy; 24 Feb 1975
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Campi, X.; Stringari, S.
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire
AbstractAbstract
[en] A functional relation between the kinetic energy density and the total density is used to analyse the surface properties of semi-infinite Fermi systems. One find an explicit expression for the surface thickness in which the role of the infinite matter compressibility, binding energy and non-locality effects is clearly shown. The method, which holds both for nuclear and electronic systems (liquid metals), yields a very simple relation between the surface thickness and the surface energy
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Oct 1979; 23 p
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