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Browsing Física by Author "Hirsch, JG"

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Browsing Física by Author "Hirsch, JG"

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  • Bounds on the presence of quantum chaos in nuclear masses
    Hirsch, JG; Frank, A; Barea, J; Van Isacker, P; Velázquez, VM (2005)
    Differences between measured nuclear masses and those calculated using the Finite-Range Droplet Model are analyzed. It is shown that they have a well defined, clearly correlated oscillatory component as a function of the ...
  • Garvey-Kelson relations and the new nuclear mass tables
    Barea, J; Frank, A; Hirsch, JG; Van Isacker, P; Pittel, S; Velázquez, VM (2008)
    We discuss the Garvey-Kelson mass relations in an extended formalism and show how they can be used to test and improve the consistency of the most commonly used mass formulas to achieve more accurate predictions.
  • Ground state energy fluctuations in the nuclear shell model
    Hirsch, JG; Frank, A; Barea, J; Zuker, AP; Velázquez, VM (2005)
    Statistical fluctuations of the nuclear ground state energies are estimated using shell model calculations in which particles in the valence shells interact through well-defined forces, and are coupled to an upper shell ...
  • Image reconstruction of nuclear masses
    Morales, IO; Mendoza-Temis, J; Barea, J; Frank, A; Hirsch, JG; Vieyra, JCL; Van Isacker, P; Velázquez Aguilar, VM (2009)
    The differences between measured masses and Liquid Drop Model (LDM) predictions have well known regularities, which can be analyzed as a two-dimensional texture on the N-Z plane. The remaining microscopic effects, obtained ...
  • Masses of atomic nuclei far from stability
    Barea, J; Frank, A; Hirsch, JG; Van Isacker, P; Velázquez, VM (2007)
    It is shown that a new way of applying a set of nuclear-mass relations among neighbouring nuclei, known as the Garvey-Kelson (GK) relations, holds exceptionally well for all currently measured masses. It is then demonstrated ...
  • Nuclear mass prediction as an image reconstruction problem: can observed pattern determine mass values?
    Frank, A; Vieyra, JCL; Agiss, IM; Barea, J; Hirsch, JG; Van Isacker, R; Velázquez, VM (2006)
    Theoretical prediction of nuclear masses is analyzed as a pattern recognition problem on the N-Z plane. A global pattern is observed by plotting the differences between measured masses and Liquid Drop Model (LDM) predictions. ...
  • Nuclear masses and the number of valence nucleons
    Mendoza-Temis, J; Frank, A; Hirsch, JG; Vieyra, JCL; Morales, I; Barea, J; Van Isacker, P; Velázquez Aguilar, VM (2008)
    An improved version of the liquid drop model is presented. The addition of two terms, linear and quadratic in the total number of valence nucleons (particles or holes), improves the description of atomic masses, which can ...
  • Perspectives on nuclear mass formulae
    Barea, J; Frank, A; Hirsch, JG; Van Isacker, P; Mendoza-Temis, J; Morales, I; Pittel, S; López-Vieyra, JC; Velázquez, VM (2008)
    We discuss different nuclear mass tables (experimental and calculated) in the context of the Garvey-Kelson relations and show how these relations can provide a very useful tool to test and improve the consistency of the models.
  • Phase transitions and accidental degeneracy in nonlinear spin systems
    Castanos, O; Hirsch, JG; López-Pena, R; López-Moreno, E (2005)
    A characterization of phase transitions and related accidental degeneracies is presented for a general spin Hamiltonian containing linear and quadratic terms. The existence of first-, second-, and third-order phase transitions ...
  • Predicting nuclear masses by image reconstruction
    Morales, I; Frank, A; Barea, J; Hirsch, JG; Van Isacker, P; López-Vieyra, JC; Velázquez, VM (2006)
    The differences between measured masses and Liquid Drop Model (LDM) predictions have well known regularities, which can be analyzed as a two-dimensional texture on the N-Z plane. The remaining microscopic effects, obtained ...
  • Two-dimensional Fourier analysis of the nuclear mass errors
    Frank, A; Hirsch, JG; Barea, J; López-Vieyra, JC; Velázquez, VM (2004)
    Differences between measured and calculated masses are studied using two-dimensional Fourier analysis. Low frequency components are associated with residual correlations.
  • An upper limit of ground-state energy fluctuations in nuclear masses
    Hirsch, JG; Frank, A; Barea, J; Van Isacker, P; Zuker, AP; Velázquez, VM (2006)
    Shell model calculations are employed to estimate an upper limit of statistical fluctuations in the nuclear ground-state energies. In order to mimic the presence of quantum chaos associated with neutron resonances at ...

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