Enviaments recents

  • Measurement of key resonance states for the 40P(p,g)31S reaction rate, and the production of intermediate-mass elements in nova explosions 

    Kankainen, A; Woods, P.J.; Schatz, H.; Poxon-Pearson, T; Doherty, D.T.; Bader, V.; Baugher, T.; Bazin, D.; Brown, B.A.; Browne, J.; Estrade, A.; Gade, A.; José Pont, Jordi; Kontos, A.; Langer, C.; Lotay, G.; Meisel, Z.; Montes, F.; Noji, S.; Nunes, F.; Perdikakis, G.; Pereira, J.; Recchia, F.; Redpath, T.; Stroberg, R.; Scott, M.; Seweryniak, D.; Stevens, J.; Weisshaar, D.; Wimmer, K.; Zegers, R. (Elsevier, 2017-05-17)
    Article
    Accés obert
    We report the first experimental constraints on spectroscopic factors and strengths of key resonances in the 30P(p, γ)31Sreaction critical for determining the production of intermediate-mass elements up to Ca in nova ejecta. ...
  • A Parameterized multi-step Newton method for solving systems of nonlinear equations 

    Ahmad, Fayyaz; Tohidi, Emran; Carrasco, Juan A. (2016-03-01)
    Article
    Accés obert
    We construct a novel multi-step iterative method for solving systems of nonlinear equations by introducing a parameter. to generalize the multi-step Newton method while keeping its order of convergence and computational ...
  • Multi-step frozen Jacobian iterative scheme for solving IVPs and BVPs based on higher order Fréchet derivatives 

    Ilyas, Iqra; Ali, Zulqar; Ahmad, Fayyaz; Ullah, Malik Zaka; Alshomrani, Ali Saleh (Punjab University, 2017-01-23)
    Article
    Accés restringit per política de l'editorial
    A multi-step frozen Jacobian iterative scheme for solving system of nonlinear equations associated with IVPs (initial value problems) and BVPs (boundary value problems) is constructed. The multi-step iterative ...
  • Orbital periods and component masses of three double white dwarfs 

    Rebassa Mansergas, Alberto; Parsons, S. G.; García-Berro Montilla, Enrique; Gaensicke, B. T.; Schreiber, Mathias R.; Rybicka, M.; Koester, D. (2017-04-01)
    Article
    Accés obert
    The merger of close double white dwarfs (CDWDs) is one of the favourite evolutionary channels for producing Type Ia supernovae (SN Ia). Unfortunately, current theories of the evolution and formation of CDWDs are still ...
  • A preconditioned iterative method for solving systems of nonlinear equations having unknown multiplicity 

    Ahmad, Fayyaz; Bhutta, Toseef Akhter ; Sohaib, Umar; Ullah, Malik Zaka; Alshomrani, Ali Saleh; Ahmad, Shamshad; Ahmad, Shahid (2017-01-18)
    Article
    Accés obert
    A modification to an existing iterative method for computing zeros with unknown multiplicities of nonlinear equations or a system of nonlinear equations is presented. We introduce preconditioners to nonlinear equations or ...
  • Non-extensive statistics to the cosmological lithium problem 

    Hou, S.Q.; He, J.J.; Parikh, Anuj Ramesh (2017-01-11)
    Article
    Accés obert
    Big Bang nucleosynthesis (BBN) theory predicts the abundances of the light elements D, 3He, 4He, and 7Li produced in the early universe. The primordial abundances of D and 4He inferred from observational data are in good ...
  • Magnetic white dwarfs: Observations, theory and future prospects 

    García-Berro Montilla, Enrique; Kilic, Mukremin; Kepler, S.O. (2016-01)
    Article
    Accés obert
    Isolated magnetic white dwarfs have field strengths ranging from 10(3)G to 10(9) G, and constitute an interesting class of objects. The origin of the magnetic field is still the subject of a hot debate. Whether these fields ...
  • A common origin of magnetism from planets to white dwarfs 

    Isern Vilaboy, Jordi; García-Berro Montilla, Enrique; Kulebi, Baybar; Loren Aguilar, Pablo (2017-02-20)
    Article
    Accés obert
    Isolated magnetic white dwarfs have field strengths ranging from kilogauss to gigagauss. However, the origin of the magnetic field has not been hitherto elucidated. Whether these fields are fossil, hence the remnants of ...
  • The SDSS spectroscopic catalogue of white dwarf-main-sequence binaries: new identifications from DR 9–12 

    Rebassa Mansergas, Alberto; Ren, J. J.; Parsons, S. G.; Gänsicke, Boris T.; Schreiber, Mathias R.; García-Berro Montilla, Enrique; Liu, X.; Koester, D. (2016-06-01)
    Article
    Accés obert
    We present an updated version of the spectroscopic catalogue of white dwarf-main-sequence (WDMS) binaries from the Sloan Digital Sky Survey (SDSS). We identify 938 WDMS binaries within the data releases (DR) 9-12 of SDSS ...
  • An asteroseismic constraint on the mass of the axion from the period drift of the pulsating da white dwarf star L19-2 

    Córsico, Alejandro H.; Romero, Alejandra Daniela; Althaus, Leandro G.; García-Berro Montilla, Enrique; Isern Vilaboy, Jordi; Kepler, S.O.; Miller Bartolami, Marcelo M.; Sullivan, Denis J. (2016-07-01)
    Article
    Accés obert
    We employ an asteroseismic model of L19-2, a relatively massive (Msstarf ~ 0.75 M¿) and hot (Teff ~ 12 100 K) pulsating DA (H-rich atmosphere) white dwarf star (DAV or ZZ Ceti variable), and use the observed values of the ...

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