758 research outputs found

    Density profiles and collective excitations of a trapped two component Fermi vapour

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    We discuss the ground state and the small-amplitude excitations of a degenerate vapour of fermionic atoms placed in two hyperfine states inside a spherical harmonic trap. An equations-of-motion approach is set up to discuss the hydrodynamic dissipation processes from the interactions between the two components of the fluid beyond mean-field theory and to emphasize analogies with spin dynamics and spin diffusion in a homogeneous Fermi liquid. The conditions for the establishment of a collisional regime via scattering against cold-atom impurities are analyzed. The equilibrium density profiles are then calculated for a two-component vapour of 40K atoms: they are little modified by the interactions for presently relevant values of the system parameters, but spatial separation of the two components will spontaneously arise as the number of atoms in the trap is increased. The eigenmodes of collective oscillation in both the total particle number density and the concentration density are evaluated analytically in the special case of a symmetric two-component vapour in the collisional regime. The dispersion relation of the surface modes for the total particle density reduces in this case to that of a one-component Fermi vapour, whereas the frequencies of all other modes are shifted by the interactions.Comment: 14 pages, 4 figure

    Fusion and Binary-Decay Mechanisms in the 35^{35}Cl+24^{24}Mg System at E/A \approx 8 MeV/Nucleon

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    Compound-nucleus fusion and binary-reaction mechanisms have been investigated for the 35^{35}Cl+24^{24}Mg system at an incident beam energy of ELab_{Lab}= 282 MeV. Charge distributions, inclusive energy spectra, and angular distributions have been obtained for the evaporation residues and the binary fragments. Angle-integrated cross sections have been determined for evaporation residues from both the complete and incomplete fusion mechanisms. Energy spectra for binary fragment channels near to the entrance-channel mass partition are characterized by an inelastic contribution that is in addition to a fully energy damped component. The fully damped component which is observed in all the binary mass channels can be associated with decay times that are comparable to, or longer than the rotation period. The observed mass-dependent cross sections for the fully damped component are well reproduced by the fission transition-state model, suggesting a fusion followed by fission origin. The present data cannot, however, rule out the possibility that a long-lived orbiting mechanism accounts for part or all of this yield.Comment: 41 pages standard REVTeX file, 14 Figures available upon request -

    Beroia : monuments funéraires : V. Allamani-Souri, Επιτύμβιες στήλες και ανάγλυφα από την Βέροια και την περιοχή της (= Τombstones and Relief Monuments from Beroia and Surrounding Region), Thessalonique, 2014

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    Doukellis Panagiotis N. Beroia : monuments funéraires : V. Allamani-Souri, Επιτύμβιες στήλες και ανάγλυφα από την Βέροια και την περιοχή της (= Τombstones and Relief Monuments from Beroia and Surrounding Region), Thessalonique, 2014. In: Dialogues d'histoire ancienne, vol. 43, n°2, 2017. pp. 277-278

    Préhistoire : sur l’organisation de l’espace bâti : St. Papadopoulos, Οικιστική οργάνωση στην προϊστορική Ελλάδα. Η νεολιθική και η πρώιμη εποχή χαλκού (= L’habitat en Grèce préhistorique. La période néolithique et le premier âge du bronze), Thessalonique, 2014

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    Doukellis Panagiotis N. Préhistoire : sur l’organisation de l’espace bâti : St. Papadopoulos, Οικιστική οργάνωση στην προϊστορική Ελλάδα. Η νεολιθική και η πρώιμη εποχή χαλκού (= L’habitat en Grèce préhistorique. La période néolithique et le premier âge du bronze), Thessalonique, 2014. In: Dialogues d'histoire ancienne, vol. 43, n°2, 2017. p. 282

    Études numismatiques II : Cos V. Stefanaki, Κως Ι (= Cos I), Athènes, Institut archéologique des études égéennes, 2012

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    Doukellis Panagiotis N. Études numismatiques II : Cos V. Stefanaki, Κως Ι (= Cos I), Athènes, Institut archéologique des études égéennes, 2012. In: Dialogues d'histoire ancienne, vol. 39, n°2, 2013. p. 328

    M. Lilibaki-Akamati, Rockcut Chamber Tombs of Pelle

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    Doukellis Panagiotis N. M. Lilibaki-Akamati, Rockcut Chamber Tombs of Pelle. In: Dialogues d'histoire ancienne, vol. 22, n°2, 1996. p. 187

    E.P. Dimitriadis et al. (éds.), Roads and crossroads of the Balkans from Antiquity to the European Union

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    Doukellis Panagiotis N. E.P. Dimitriadis et al. (éds.), Roads and crossroads of the Balkans from Antiquity to the European Union. In: Dialogues d'histoire ancienne, vol. 24, n°2, 1998. p. 163

    Autour du Sénat des cités grecques à l'époque impériale : N. Giannakopoulos, Recherches autour du Sénat des cités grecques durant la période romaine.

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    Doukellis Panagiotis N. Autour du Sénat des cités grecques à l'époque impériale : N. Giannakopoulos, Recherches autour du Sénat des cités grecques durant la période romaine.. In: Dialogues d'histoire ancienne, vol. 30, n°2, 2004. pp. 161-162

    Les Romains à Thessalonique : D.B. Grammenos (éd.), Ρωμαϊκή Θεσσαλονίκη D.B. Grammenos (éd.), Roman Thessaloniki.

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    Doukellis Panagiotis N. Les Romains à Thessalonique : D.B. Grammenos (éd.), Ρωμαϊκή Θεσσαλονίκη D.B. Grammenos (éd.), Roman Thessaloniki.. In: Dialogues d'histoire ancienne, vol. 29, n°2, 2003. pp. 201-202

    Mélanges d’archéologie grecque. S. Pingiatoglou, Th. Stefanidou-Tiveriou (éds), Νάματα. Τιμητικός τόμος για τον καθηγητή Δημήτριο Παντερμαλή (= Namata. Mélanges offerts au Professeur Demetrios Pantermalis) P. Valavanis (éd.), Ταξιδεύοντας στην κλασική Ελλάδα. Τόμος προς τιμήν του καθηγητή Πέτρου Θέμελη (= Voyager en Grèce classique. Hommages au Professeur Petros Thémélis)

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    Doukellis Panagiotis N. Mélanges d’archéologie grecque. S. Pingiatoglou, Th. Stefanidou-Tiveriou (éds), Νάματα. Τιμητικός τόμος για τον καθηγητή Δημήτριο Παντερμαλή (= Namata. Mélanges offerts au Professeur Demetrios Pantermalis) P. Valavanis (éd.), Ταξιδεύοντας στην κλασική Ελλάδα. Τόμος προς τιμήν του καθηγητή Πέτρου Θέμελη (= Voyager en Grèce classique. Hommages au Professeur Petros Thémélis). In: Dialogues d'histoire ancienne, vol. 37, n°2, 2011. p. 252
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