Mostrando recursos 1 - 20 de 28

  1. Equation of state for dense nucleonic matter from metamodeling. I. Foundational aspects

    Margueron , Jérôme; Hoffmann Casali , Rudiney; Gulminelli , Francesca
    International audience

  2. Equation of state for dense nucleonic matter from metamodeling. II. Predictions for neutron star properties

    Margueron , Jérôme; Hoffmann Casali , Rudiney; Gulminelli , Francesca
    International audience

  3. Study of the behaviour of nucleonic degrees of freedom in peripheral heavy-ion collisions

    Boose, D.; Richert, J.

  4. Deformed atomic nuclei with degeneracies of the nucleonic levels higher than 2

    Li, X.; Dudek, J.

  5. Extended investigation of superdeformed bands in $^{151,152}$Tb nuclei

    Robin , J.; Byrski , Th.; Duchêne , G.; Beck , F.A.; Curien , D.; Dubray , N.; Dudek , J.; Góźdź , A.; Odahara , A.; Schunck , N.; Adimi , N.; Appelbe , D.E.; Bednarczyk , P.; Bracco , A.; Cederwall , B.; Courtin , S.; M. Cullen , D.; Dorvaux , O.; Ertück , S.; De France , G.; Gall , B.; Joshi , P.; L. King , S.; Korichi , A.; Lagergren , K.; Lo Bianco , G.; Leoni , S.; Lopez-Martens , A.; Lunardi , S.; Million , B.; Nourredine , A.; Pachoud , E.; S. Paul , E.; Petrache , C.; Piqueras , I.; Redon , N.; Saltarelli , A.; Simpson , J.; Stezowski , O.; Venturelli , R.; Vivien , J.P.; Zuber , K.
    A detailed study of known and new SD bands in Tb isotopes has been performed with the use of the EUROBALL IV -ray array. The high-statistics data set has allowed for the extension of known SD bands at low and high spins by new -ray transitions. These transitions, as it turns out, correspond to the rotational frequencies where the principal superdeformed gaps (Z=66,N=86) close giving rise to up- or down-bending mechanisms. This enables to attribute the underlying theoretical configurations with much higher confidence as compared to the previous identifications. Five new SD bands have been discovered, three of them assigned...

  6. Empirical equation of state for dense nucleonic matter

    Margueron , Jérôme; Casali , Rudiney
    International audience

  7. Chiral Symmetry Restoration in nuclei and Parity Mixing

    Chanfray , G.; Delorme , J.; Ericson , M.
    We derive the expressions of the vector and axial current from a chiral Lagrangian restricted to nucleons and pions. They display mixing terms between the axial and vector currents. We study how the modification of the quark condensate affects the coupling constants of the axial cur- rent, namely the pion decay constant and the nucleonic axial one. In the second case and in a dense medium, we express the renormalization as a meson exchange current. By doing so we show what part of the scalar density of the quarks contributes to the renormalization. We give an estimate for the quenching...

  8. Off-shell effects in the electromagnetic production of strangeness

    Mizutani , T.; Fayard , C.; Lamot , G.-H.; Saghai , B.
    Previous approaches to the photo- and electro-production of strangeness off the proton, based upon effective hadronic Lagrangians, are extended here to incorporate the so called off-shell effects inherent to the fermions with spin = 3/2. A formalism for intermediate-state, spin 3/2, nucleonic and hyperonic resonances is presented and applied to the processes $\gamma + p ---> K^{+} + as well as the branching ratio for the crossed channel reaction $K^- + p ---> significant, of various observables to such effects are discussed.

  9. Microscopic calculation of the nucleonic levels and means qquare radii of atomic nuclei with the new Woods-Saxon potential parameters

    Lojewski, Z.; Nerlo-Pomorska, B.; Dudek, J.

  10. Nucleonic resonance excitations with linearly polarized photon in $\gamma p\to\omega p$

    Zhao, Q.
    In this work, an improved quark model approach to the $\omega$ meson photo-production with an effective Lagrangian is presented. The {\it t}-channel {\it natural}-parity exchange is taken into account through the Pomeron exchange, while the {\it unnatural}-parity exchange is described by the $\pi^0$ exchange. With a very limited number of parameters, the available experimental data in the low energy regime can be consistently accounted for. We find that the beam polarization observables show sensitivities to some {\it s}-channel individual resonances in the $SU(6)\otimes O(3)$ quark model symmetry limit. Especially, the two resonances $P_{13}(1720)$ and $F_{15}(1680)$, which belong to the representation...

  11. Statistical description of the thermal shape fluctuations using realistic microscopic and macroscopic models

    Dubray, N.; Dudek, J.; Maj, A.
    We calculate the probability distribution describing the thermal fluctuations of the nuclear shape, using Lublin--Strasbourg Drop (LSD) model for the macroscopic nuclear energies and deformed Woods-Saxon model for the single-nucleonic level densities. Examples of applications are presented in the form of the GDR spectra of hot 46Ti and 216Rn nuclei.

  12. Non Identical strange particle correlations in Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV from the STAR experiment

    Renault, G.; Collaboration, The STAR
    3 pages, 3 figures, contribution to proceedings of the Second Warsaw Meeting on Particle Correlations and Resonances in Heavy Ion Collisions, Warsaw 15-18 Oct 2003, to be published in Nucleonica

  13. Non Identical strange particle correlations in Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV from the STAR experiment

    Renault, G.; Collaboration, The STAR
    3 pages, 3 figures, contribution to proceedings of the Second Warsaw Meeting on Particle Correlations and Resonances in Heavy Ion Collisions, Warsaw 15-18 Oct 2003, to be published in Nucleonica

  14. Non Identical strange particle correlations in Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV from the STAR experiment

    Renault, G.; Collaboration, The STAR
    3 pages, 3 figures, contribution to proceedings of the Second Warsaw Meeting on Particle Correlations and Resonances in Heavy Ion Collisions, Warsaw 15-18 Oct 2003, to be published in Nucleonica

  15. Non Identical strange particle correlations in Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV from the STAR experiment

    Renault, G.; Collaboration, The STAR
    3 pages, 3 figures, contribution to proceedings of the Second Warsaw Meeting on Particle Correlations and Resonances in Heavy Ion Collisions, Warsaw 15-18 Oct 2003, to be published in Nucleonica

  16. Non Identical strange particle correlations in Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV from the STAR experiment

    Renault, G.; Collaboration, The STAR
    3 pages, 3 figures, contribution to proceedings of the Second Warsaw Meeting on Particle Correlations and Resonances in Heavy Ion Collisions, Warsaw 15-18 Oct 2003, to be published in Nucleonica

  17. The nuclear equation of state

    Suraud, E.
    We present part of our (direct or indirect) knowledge on the equation of state of nuclear matter in a density-temperature domain for which nucleonic effects are dominant (densities smaller than 2-4 times the saturation density and temperatures smaller than 10-20 MeV). The text is divided into three parts corresponding, respectively, to direct studies close to the saturation, to the astrophysical case and to the studies involving heavy-ion collisions. In chapter one, after a brief introduction to the concept of equation of state, we disçuss the saturation property of nuclear matter. The notion of incompressibility modulus is also introduced and its...

  18. Exploring the density dependence of the symmetry energy with isotopic distributions

    Marini, P.
    The properties of nuclear matter in the nucleonic regime are determined by the nuclear interaction, which is, in turn, uniquely linked to the nuclear equation of state (EOS). In spite of its key role in determining important properties of exotic nuclei and astrophysical objects such as neutron stars, the equation of state for asymmetric nuclear matter has relatively few constraints. In particular, the density dependence of the potential part of the symmetry energy term of the EOS represents one of the main challenges for the research activities in nuclear physics. The isotopic distributions of complex fragments produced in multifragmentation reactions...

  19. Exploration of new methods for Lattice QCD

    Rios Tascon, Andres
    We explore two methods aimed at alleviating two difficulties in Lattice QCD: statistical noise and data storage. The first method intends to improve the signal-to-noise (S/N) ratio in three-point correlators, by extending previous work by Detmold and Endres. We test the method in the measurement of two observables: the nucleonic axial charge, and a matrix element computation related to the electromagnetic form factor of the rho meson. Only in the case of the rho we see a very slight improvement. We conclude that, in general, a case-by-case study would be needed to determine the effectiveness of the S/N optimization. The...

  20. An empirical approach combining nuclear physics and dense nucleonic matter

    Margueron , J.
    International audience

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