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  • 1.
    Blaschke, D.
    et al.
    University of Wroclaw.
    Klähn, T.
    University of Wroclaw.
    Łastowiecki, R.
    University of Wroclaw.
    Sandin, Fredrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    How strange are compact star interiors?2010In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 37, no 9Article in journal (Refereed)
    Abstract [en]

    We discuss a Nambu-Jona-Lasinio (NJL)-type quantum field theoretical approach to the quark matter equation of state with color superconductivity and construct hybrid star models on this basis. It has recently been demonstrated that with increasing baryon density, the different quark flavors may occur sequentially, starting with down-quarks only, before the second light quark flavor and at highest densities the strange quark flavor also appears. We find that color superconducting phases are favorable over non-superconducting ones, which entails consequences for thermodynamic and transport properties of hybrid star matter. In particular, for NJL-type models no strange quark matter phases can occur in compact star interiors due to mechanical instability against gravitational collapse, unless a sufficiently strong flavor mixing as provided by the Kobayashi-Maskawa-'t Hooft determinant interaction is present in the model. We discuss observational data on mass-radius relationships of compact stars which can put constraints on the properties of the dense matter equation of state.

  • 2.
    Blaschke, David
    et al.
    University of Wroclaw.
    Klahn, Thomas
    Argonne National Laboratory, Argonne, IL.
    Sandin, Fredrik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Equation of state at high densities and modern compact star observations2008In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 35, no 1, p. 014051-6Article in journal (Refereed)
    Abstract [en]

    Recently, observations of compact stars have provided new data of high accuracy which put strong constraints on the high-density behaviour of the equation of state of strongly interacting matter otherwise not accessible in terrestrial laboratories. The evidence for neutron stars with high mass (M = 2.1 +/- 0.2 M-circle dot for PSR J0751 + 1807) and large radii (R > 12 km for RX J1856-3754) rules out soft equations of state and has provoked a debate whether the occurrence of quark matter in compact stars can be excluded as well. In this contribution, it is shown that modern quantum field theoretical approaches to quark matter including colour superconductivity, and a vector meanfield allow a microscopic description of hybrid stars which fulfil the new, strong constraints. The deconfinement transition in the resulting stiff hybrid equation of state is weakly first order so that its signals have to be expected due to specific changes in transport properties governing the rotational and cooling evolution caused by the colour superconductivity of quark matter. A similar conclusion holds for the investigation of quark deconfinement in future generations of nucleus-nucleus collision experiments at low temperatures and high baryon densities such as CBM @ FAIR.

  • 3.
    Blaschke, David
    et al.
    University of Wroclaw.
    Sandin, Fredrik
    Klähn, Thomas
    Argonne National Laboratory, Argonne, IL.
    1-2-3-flavor color superconductivity in compact stars2008In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 35, no 10Article in journal (Refereed)
    Abstract [en]

    We suggest a scenario where the three light quark flavors are sequentially deconfined under increasing pressure in cold asymmetric nuclear matter as, e.g., in neutron stars. The basis for our analysis is a chiral quark matter model of Nambu–Jona-Lasinio (NJL) type with diquark pairing in the single flavor color-spin-locking (CSL), 2-flavor (2SC) and 3-flavor color-flavor locking (CFL) channels, and a Dirac–Brueckner–Hartree–Fock (DBHF) approach in the nuclear matter sector. We find that nucleon dissociation sets in at about the saturation density, n0, when the down-quark Fermi sea is populated (d-quark dripline) due to the flavor asymmetry imposed by β-equilibrium and charge neutrality. At about 3n0 u-quarks appear forming a 2-flavor color superconducting (2SC) phase, while the s-quark Fermi sea is populated only at still higher baryon density. The hybrid star sequence has a maximum mass of 2.1 M. Two- and 3-flavor quark matter phases are found only in gravitationally unstable hybrid star solutions.

  • 4.
    Trautvetter, H. P.
    et al.
    Institut Für Experimentalphysik III.
    Bemmerer, D.
    Forschungszentrum Dresden-Rossendorf.
    Bonetti, R.
    Istituto di Fisica Generale Applicata.
    Broggini, C.
    Istituto Nazionale di Fisica Nucleare (INFN).
    Caciolli, A.
    Istituto Nazionale di Fisica Nucleare (INFN).
    Confortola, F.
    Università di Genova.
    Corvisiero, P.
    Università di Genova.
    Costantini, H.
    Università di Genova.
    Elekes, Z.
    Institute of Nuclear Research (ATOMKI), Debrecen.
    Formicola, A.
    INFN.
    Fülöp, Zs
    Institute of Nuclear Research (ATOMKI), Debrecen.
    Gervino, G.
    Dipartimento di Fisica Sperimentale, Università di Torino.
    Guglielmetti, A.
    Istituto di Fisica Generale Applicata.
    Gyürky, Gy
    Institute of Nuclear Research (ATOMKI), Debrecen.
    Gustavino, C.
    INFN.
    Imbriani, G.
    Dipartimento di Scienze Fisiche, Universitá Federico II.
    Junker, M.
    INFN.
    Lemut, A.
    Università di Genova.
    Limata, B.
    Dipartimento di Scienze Fisiche, Universitá Federico II.
    Marta, M.
    Forschungszentrum Dresden-Rossendorf.
    Mazzocchi, C.
    Istituto di Fisica Generale Applicata.
    Menegazzo, R.
    Istituto Nazionale di Fisica Nucleare (INFN).
    Prati, P.
    Università di Genova.
    Roca, V.
    Dipartimento di Scienze Fisiche, Universitá Federico II.
    Rolfs, C.
    Institut Für Experimentalphysik III.
    Vomiero, Alberto
    INFM-CNR Sensor Lab.
    Ground state capture in 14N(p,γ)15O studied above the 259 keV resonance at LUNA2008In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 35, no 1, article id 14019Article in journal (Refereed)
    Abstract [en]

    We report on a new measurement of 14N(p,γ)15O for the ground state capture transition at Ep = 360, 380 and 400 keV, using the 400 kV LUNA accelerator. The true coincidence summing effect - the major source of error in the ground state capture determination - has been significantly reduced by using a Clover-type gamma detector. © 2008 IOP Publishing Ltd.

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