Now showing items 1-20 of 36

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      A calculation of low-lying collective states in odd-even nuclei  [Article]

      Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Bijker, R.; Iachello, F. (Elsevier, 1984)
      We present results of a calculation of properties of low-lying collective quadrupole states in odd-even nuclei within the framework of the proton-neutron interacting boson-fermion model.
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      Algebraic determination of scattering matrices  [Article]

      Alonso Alonso, Clara Eugenia; Frank Hoeflich, Alejandro; Gómez Camacho, Joaquín José (1993)
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      Anharmonic double-γ vibrations in nuclei and their description in the interacting boson model  [Article]

      García Ramos, José Enrique; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Van Isacker, Piet (American Physical Society, 2000-04-01)
      Double-γ vibrations in deformed nuclei are studied in the context of the interacting boson model with special reference to their anharmonic character. It is shown that large anharmonicities can be obtained with interactions ...
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      Backbending of Dy isotopes described with the neutron-photon IBA plus two-quasiparticle model  [Article]

      Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Lozano Leyva, Manuel Luis (Elsevier, 1986)
      The formalism of the neutron-photon interacting boson model, extended to include two-quasiparticle excitations, is used in a study of the high spin states of 154,156,158Dy isotropes. Good agreement is obtained between the ...
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      Boson-conserving one-nucleon transfer operator in the interacting boson model  [Article]

      Barea, J.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel (American Physical Society, 2002-03-01)
      The boson-conserving one-nucleon transfer operator in the interacting boson model (IBM) is reanalyzed. Extra terms are added to the usual form used for that operator. These new terms change generalized seniority by ...
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      Coherent state approach to the interacting boson model: Test of its validity in the transitional region  [Article]

      Inci, I.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Fortunato, Lorenzo; Vitturi, Andrea (The American Physical Society, 2009)
      The predictive power of the coherent state (CS) approach to the interacting boson model (IBM) is tested far from the IBM dynamical symmetry limits. The transitional region along the γ-unstable path from U(5) to O(6) is ...
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      Continuum discretised BCS approach for weakly bound nuclei  [Article]

      Alonso Alonso, Clara Eugenia; Fortunato, Lorenzo; Vitturi, Andrea; Lay Valera, José Antonio (IOP Publishing, 2016)
      The Bardeen-Cooper-Schrieffer (BCS) formalism is extended by including the single-particle continuum in order to analyse the evolution of pairing in an isotopic chain from stability up to the drip line. We propose a continuum ...
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      Coupling of Dipole Mode to γ -unstable Quadrupole Oscillations  [Article]

      Alonso Alonso, Clara Eugenia; Andrés Martín, María Victoria; Arias Carrasco, José Miguel; Lanza, Edoardo G.; Vitturi, Andrea (Elsevier, 2000)
      The coupling of the high-lying dipole mode to the low-lying quadrupole modes for the case of deformed γ-unstable nuclei is studied. Results from the geometrical model are compared to those obtained within the dipole boson ...
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      Critical-point symmetries in Boson-Fermion systems: The case of shape transitions in odd nuclei in a multiorbit model  [Article]

      Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Vitturi, Andrea (American Physical Review, 2007-02-05)
      We investigate phase transitions in boson-fermion systems. We propose an analytically solvable model [E(5/12)] to describe odd nuclei at the critical point in the transition from the spherical to γ-unstable behavior. In ...
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      Desarrollos microscópicos y cálculos en el marco del modelo de bosones y fermiones en interacción  [PhD Thesis]

      Barea Muñoz, José (2002-12-10)
      La presente Tesis Doctoral se desarrolla en el marco de los modelos de bosones en interacción (IBM) y de bosones y fermiones en interacción (IBFM), los cuales permiten estudiar las propiedades de los estados colectivos más ...
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      Importance of the single-particle continuum in BCS pairing with a pseudostate basis  [Article]

      Lay Valera, José Antonio; Alonso Alonso, Clara Eugenia; Fortunato, Lorenzo; Vitturi, Andrea (EDP Sciences, 2016)
      In a recent work [arXiv:1510.03185] the use of the Transformed Harmonic Oscillator (THO) basis for the discretization of the singleparticle continuum into a Generalized Bardeen-Cooper-Schrieffer (BCS) formalism was proposed ...
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      Intrinsic structure of two-phonon states in the interacting boson model  [Article]

      García Ramos, José Enrique; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Van Isacker, Piet; Vitturi, Andrea (Elsevier, 1998)
      A general study of excitations up to two-phonon states is carried out using the intrinsicstate formalism of the Interacting Boson Model (IBM). Spectra and transitions for the different dynamical symmetries are analyzed and ...
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      Nuclear structure information obtained from charge radii  [Article]

      Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Iachello, F. (Elsevier, 1985)
      We analyze the nuclear structure information obtained from measurements of charge radii in even-even and even-odd nuclei terms of the interacting boson model. The observed deviations from the smooth behavior, R = R0A1 3, ...
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      Odd-even 147–153Pm isotopes within the neutron-proton interacting boson-fermion model  [Article]

      Barea, J.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel (American Physical Society, 2011)
      Low-lying energy states of the 147 -153Pm isotopic chain are studied within the framework of the neutron-proton interacting boson-fermion model (IBFM-2). The spectra of these isotopes show a transition from a particle ...
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      One nucleon transfer operator and nuclear supersymmetry  [Article]

      Barea, J.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Jolie, J. (American Physical Society, 2005-01-01)
      The appropriate use of the interacting boson-fermion model one nucleon transfer operator in connection with nuclear supersymmetries is discussed. We emphasize that care must be taken in using the same coupling ...
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      One-particle spectroscopic intensities as a signature of shape phase transition: The γ -unstable case  [Article]

      Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Vitturi, Andrea (American Physical Society, 2006-08-09)
      We investigate the evolution of one-particle spectroscopic intensities as a possible signature of shape phase transitions. The study describes the odd systems in terms of the interacting boson–fermion model. We consider ...
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      Phase diagram for a cubic-Q interacting boson model Hamiltonian: Signs of triaxiality  [Article]

      Fortunato, Lorenzo; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; García Ramos, José Enrique; Vitturi, Andrea (American Physical Society, 2011)
      An extension of the Interacting Boson Model that includes the cubic (QI×QI×Q I)(0) term is proposed. The potential energy surface for the cubic quadrupole interaction is explicitly calculated within the coherent state ...
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      Phase transitions in the interacting boson fermion model: The γ -unstable case  [Article]

      Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Fortunato, R.; Vitturi, Andrea (American Physical Society, 2005-01-11)
      The phase transition around the critical point in the evolution from spherical to deformed γ-unstable shapes is investigated in odd nuclei within the interacting boson fermion model. We consider the particular case of an ...
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      Population of mixed-symmetry states via α transfer reactions  [Article]

      Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Fortunato, Lorenzo; Pietralla, N.; Vitturi, Andrea (The American Physical Society, 2008)
      Within the neutron-proton interacting boson model we study the population of mixed-symmetry states via α transfer processes. Closed expressions are deduced in the case of the limiting Uπ+ν(5) and SUπ+ν(3). We find that the ...
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      Prealignment B(E2)-anomaly in 124Xe  [Article]

      Hanewinkel, H.; Gast, Werner; Kaup, U.; Harter, H.; Dewald, Alfred; Gelberg, Adrian; Reinhardt, R.; Von Brentano, Peter; Zemel, A.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel (Elsevier, 1983)
      Lifetimes of 17 levels of 124Xe were measured using the Recoil Distance Doppler Shift method. An anomalous E2-reduction was observed, starting at Iπ = 8+ and Iπ = 5+ in the groundstate and in the quasi-gamma band respectively. ...