Mostrando recursos 1 - 20 de 35

  1. Single-particle spatial dispersion and clusters in nuclei

    Ebran , J.-P.; Khan , E.; Lasseri , R.-D; Vretenar , D.
    The spatial dispersion of the single-nucleon wave functions is analyzed using the self-consistent mean-field framework based on nuclear energy density functionals, and with the harmonic oscillator approximation for the nuclear potential. It is shown that the dispersion depends on the radial quantum number n, but displays only a very weak dependence on the orbital angular momentum. An analytic expression is derived for the localization parameter that explicitly takes into account the radial quantum number of occupied single-nucleon states. The conditions for single-nucleon localization and formation of cluster structures are fulfilled in relatively light nuclei with $A \leq 30$ and $n=1$...

  2. Nuclear Equation of state for Compact Stars and Supernovae

    Burgio , G.; Fantina , Anthea
    The equation of state (EoS) of hot and dense matter is a fundamental input to describe static and dynamical properties of neutron stars, core-collapse supernovae and binary compact-star mergers. We review the current status of the EoS for compact objects, that have been studied with both ab-initio many-body approaches and phenomenological models. We limit ourselves to the description of EoSs with purely nucleonic degrees of freedom, disregarding the appearance of strange baryonic matter and/or quark matter. We compare the theoretical predictions with different data coming from both nuclear physics experiments and astrophysical observations. Combining the complementary information thus obtained greatly...

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

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

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

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

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

    Boose, D.; Richert, J.

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

    Li, X.; Dudek, J.

  7. 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...

  8. Empirical equation of state for dense nucleonic matter

    Margueron , Jérôme; Casali , Rudiney
    International audience

  9. 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...

  10. 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.

  11. 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.

  12. 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...

  13. 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.

  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. 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

  18. 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

  19. 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

  20. 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...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.