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Browsing by Author "Alonso Alonso, Clara Eugenia"
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A calculation of lowlying collective states in oddeven 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 lowlying collective quadrupole states in oddeven nuclei within the framework of the protonneutron interacting bosonfermion model.

Algebraic determination of scattering matrices [Article]
Alonso Alonso, Clara Eugenia; Frank Hoeflich, Alejandro; Gómez Camacho, Joaquín José (1993) 
Anharmonic doubleγ 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, 20000401)Doubleγ 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 ...

Backbending of Dy isotopes described with the neutronphoton IBA plus twoquasiparticle model [Article]
Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Lozano Leyva, Manuel Luis (Elsevier, 1986)The formalism of the neutronphoton interacting boson model, extended to include twoquasiparticle excitations, is used in a study of the high spin states of 154,156,158Dy isotropes. Good agreement is obtained between the ...

Bosonconserving onenucleon transfer operator in the interacting boson model [Article]
Barea, J.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel (American Physical Society, 20020301)The bosonconserving onenucleon 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 ...

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 γunstable path from U(5) to O(6) is ...

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 BardeenCooperSchrieffer (BCS) formalism is extended by including the singleparticle continuum in order to analyse the evolution of pairing in an isotopic chain from stability up to the drip line. We propose a continuum ...

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 highlying dipole mode to the lowlying quadrupole modes for the case of deformed γunstable nuclei is studied. Results from the geometrical model are compared to those obtained within the dipole boson ...

Criticalpoint symmetries in BosonFermion 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, 20070205)We investigate phase transitions in bosonfermion 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 γunstable behavior. In ...

Desarrollos microscópicos y cálculos en el marco del modelo de bosones y fermiones en interacción [PhD Thesis]
Barea Muñoz, José (20021210)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 ...

Importance of the singleparticle 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 BardeenCooperSchrieffer (BCS) formalism was proposed ...

Intrinsic structure of twophonon 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 twophonon 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 ...

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 eveneven and evenodd nuclei terms of the interacting boson model. The observed deviations from the smooth behavior, R = R0A1 3, ...

Oddeven 147–153Pm isotopes within the neutronproton interacting bosonfermion model [Article]
Barea, J.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel (American Physical Society, 2011)Lowlying energy states of the 147 153Pm isotopic chain are studied within the framework of the neutronproton interacting bosonfermion model (IBFM2). The spectra of these isotopes show a transition from a particle ...

One nucleon transfer operator and nuclear supersymmetry [Article]
Barea, J.; Alonso Alonso, Clara Eugenia; Arias Carrasco, José Miguel; Jolie, J. (American Physical Society, 20050101)The appropriate use of the interacting bosonfermion model one nucleon transfer operator in connection with nuclear supersymmetries is discussed. We emphasize that care must be taken in using the same coupling ...

Oneparticle 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, 20060809)We investigate the evolution of oneparticle 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 ...

Phase diagram for a cubicQ 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 ...

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, 20050111)The phase transition around the critical point in the evolution from spherical to deformed γunstable shapes is investigated in odd nuclei within the interacting boson fermion model. We consider the particular case of an ...

Population of mixedsymmetry 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 neutronproton interacting boson model we study the population of mixedsymmetry 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 ...

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 E2reduction was observed, starting at Iπ = 8+ and Iπ = 5+ in the groundstate and in the quasigamma band respectively. ...