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Browsing by Author "Pérez Bernal, Francisco"
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Algebraic approach to two-dimensional systems : shape phase transitions, monodromy, and thermodynamic quantities
Pérez Bernal, Francisco
; Iachello, F. (American Physical Society, 2008)
We analyze shape phase transitions in two-dimensional algebraic models. We apply our analysis to linearto- bent transitions in molecules and point out what observables are particularly sensitive to the transition ... -
Algebraic theory of endohedrally confined diatomic molecules: Application to H2@C60
Fortunato, Lorenzo; Pérez Bernal, Francisco (American Physical Society, 2016)
A simple and yet powerful approach for modeling the structure of endohedrally confined diatomic molecules is introduced. The theory, based on a u(4)⊕u(3) dynamical algebra, combines u(4), the vibron model dynamical algebra, ... -
An algebraic alternative for the accurate simulation of CO 2 Raman spectra
Bermúdez Montaña, Marisol; Carvajal Zaera, Miguel; Pérez Bernal, Francisco; Lemus, Renato (John Wiley and Sons, 2020)
We present an accurate simulation of the Raman spectrum of the carbon dioxide molecule in the 1150–1500 cm−1 spectral range, comparing the results obtained using the three polyad schemes found in the literature of this ... -
Analytical transformed harmonic oscillator basis for continuum discretized coupled channels calculations
Moro, A. M.; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín; Pérez Bernal, Francisco (American Physical Society, 2009)
A new method for continuum discretization in continuum-discretized coupled-channels calculations is proposed. The method is based on an analytic local-scale transformation of the harmonic-oscillatorwave functions proposed ... -
Anharmonicity effects in the bosonic U(2)-SO(3) excited-state quantum phase transition
Pérez Bernal, Francisco; Álvarez Bajo, Osiris (American Physical Society, 2010)
We study the effect of the inclusion of the U(2) Lie algebra second-order Casimir operator in a model Hamiltonian of the vibron model two-dimensional limit. We extend previously published results, showing that the inclusion ... -
Anharmonicity-induced excited-state quantum phase transition in the symmetric phase of the two-dimensional limit of the vibron model
In most cases, excited-state quantum phase transitions can be associated with the existence of critical points (local extrema or saddle points) in a system's classical limit energy functional. However, an excited-state ... -
An Approach to Global Rovibrational Analysis Based on Anharmonic Ladder Operators: Application to Hydrogen Selenide (H80 2 Se)
Álvarez Bajo, Osiris; Carvajal Zaera, Miguel; Pérez Bernal, Francisco (Elsevier, 2012-01)
An algebraic approach to perform global rovibrational analysis of molecular spectra is presented. The approach combines the onedimensional limit of the vibron model with rotational degrees of freedom. The model is based ... -
Breakup and neutron-transfer effects on 6He+206Pb elastic scattering below the Coulomb barrier
Standyło, Ł.; Acosta Sánchez, Luis Armando; Angulo, C.; Berjillos Morente, Rafael; Dueñas Díaz, José Antonio; Golovkov, M. S.; Keeley, N.; Keutgen, T.; Martel Bravo, Ismael; Mazzocco, M.; Pérez Bernal, Francisco; Sánchez Benítez, Ángel Miguel; Signorini, C.; Romoli, M.; Rusek, K.; Wolski, R. (American Physical Society, 2013)
The elastic scattering and inclusive α-particle yield for the 6He + 206Pb system at an incident energy of 18 MeV, just below the nominal Coulomb barrier, have been measured. The α-particle yield at forward angles is also ... -
Characterizing the Lipkin-Meshkov-Glick model excited state quantum phase transition using dynamical and statistical properties of the diagonal entropy
Wang, Qian; Pérez Bernal, Francisco (American Physical Society, 2021-03)
Using the diagonal entropy, we analyze the dynamical signatures of the Lipkin-Meshkov-Glick (LMG) model excited-state quantum phase transition (ESQPT). We first show that the time evolution of the diagonal entropy behaves ... -
Configuration localized wave functions : general formalism and applications to vibrational spectroscopy of diatomic molecules
Pérez Bernal, Francisco; Arias Carrasco, José Miguel; Carvajal Zaera, Miguel; Gómez Camacho, Joaquín (American Physical Society, 2000)
A general formalism for constructing configuration localized states for one-dimensional potentials is presented. It allows the evaluation of accurate approximations to the vibrational matrix elements of the momentum operator ... -
Continuum coupling in one-dimensional scattering using a transformed harmonic oscillator basis
Martel Bravo, Ismael; Pérez Bernal, Francisco; Rodríguez Gallardo, Manuela; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín (American Physical Society, 2002)
The coupling to the continuum is studied in a one-dimensional problem that describes the interaction of a weakly bound composite object with a wall in a semiclassical approach. A transformed harmonic oscillator basis is ... -
Continuum discretization using orthogonal polynomials
Pérez Bernal, Francisco; Martel Bravo, Ismael; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín (American Physical Society, 2003)
A method for discretizing the continuum by using a transformed harmonic oscillator basis has recently been presented @Phys. Rev. A 63, 052111 ~2001!#. In the present paper, we propose a generalization of that formalism which ... -
Coulomb breakup in a transformed harmonic oscillator basis
Moro, A. M.; Pérez Bernal, Francisco; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín (American Physical Society, 2006)
The problem of Coulomb breakup in the scattering of a two-body loosely bound projectile by a heavy target is addressed. A basis of transformed harmonic oscillator (THO) wave functions is used to discretize the ... -
Coupling to breakup channels using a transformed harmonic oscillator basis
Moro, A. M.; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín; Martel Bravo, Ismael; Pérez Bernal, Francisco; Crespo, R.; Nunes, F. (American Physical Society, 2001)
The application of a recently proposed procedure for discretizing the continuum to collision processes involving weakly bound nuclei is studied. In particular, the coupling to breakup states in the collision of d 1208 ... -
Dynamical probes of pairing correlations: two-particle transfer and two-particle break-up reactions
Inci, Ilyas; Pérez Bernal, Francisco; Vitturi, Andrea (IOP Publishing, 2011)
We investigate the role played by pairing correlations in two typical classes of nuclear reactions specifically involving pairs of particles: two-particle transfer reactions, where a pair of nucleons is exchanged between ... -
Elastic and break-up of the 1n-halo 11Be nucleus
Di Pietro, A.; Moro, A. M.; Acosta Sánchez, Luis Armando; Amorini, F.; Borge, M. J. G.; Figuera, P.; Fisichella, M.; Fraile, L. M.; Gómez Camacho, Joaquín; Jeppesen, H.; Lattuada, M.; Martel Bravo, Ismael; Milin, M.; Musumarra, A.; Papa, M.; Pellegriti, M. G.; Pérez Bernal, Francisco; Raabe, R.; Randisi, G.; Rizzo, F.; Scuderi, V.; Tengblad, Olof; Torresi, D.; Maira Vidal, A.; Voulot, D.; Wenander, F.; Zadro, M. (EDP Sciences, 2014)
The elastic and break-up angular distributions of the 10,11Be+64Zn reactions measured at Ec.m.≈1.4 VC have been analysed within the CCDC and O.M. frameworks. The suppression of the Coulomb-nuclear interference, observed ... -
Elastic scattering and direct reactions of the 1n halo 11Be nucleus on 64Zn near the barrier
Scuderi, V.; Di Pietro, A.; Acosta Sánchez, Luis Armando; Amorini, F.; Borge, M. J. G.; Figuera, P.; Fisichella, M.; Fraile, L. M.; Gómez Camacho, Joaquín; Jeppesen, H.; Lattuada, M.; Martel Bravo, Ismael; Milin, M.; Musumarra, A.; Papa, M.; Pellegriti, M. G.; Pérez Bernal, Francisco; Raabe, R.; Randisi, G.; Rizzo, F.; Santonocito, D.; Scalia, G.; Tengblad, Olof; Torresi, D.; Vidal, A. M.; Zadro, M. (IOP Publishing, 2012)
Elastic scattering and direct reactions have been studied for the collisions induced by the three Beryllium isotopes 9,10,11Be, on a medium mass 64Zn target at energies near the Coulomb barrier. The elastic-scattering ... -
Elastic scattering and α-particle production in 6He + 208Pb collisions at 22 MeV
Acosta Sánchez, Luis Armando; Sánchez Benítez, Ángel Miguel; Gómez Santamaría, Mario Emilio; Martel Bravo, Ismael; Pérez Bernal, Francisco; Pizarro, F.; Rodríguez Quintero, José; Rusek, K.; Álvarez, M. A. G.; Andrés, M. V.; Espino, José Manuel; Fernández García, J. P.; Gómez Camacho, Joaquín; Moro, A. M.; Angulo, C.; Cabrera Caño, Jesús; Casarejos, E.; Demaret, P.; Borge, M. J. G.; Escrig, D.; Tengblad, Olof; Cherubini, S.; Figuera, P.; Gulino, Marisa; Freer, M.; Metelko, C.; Ziman, V.; Raabe, R.; Mukha, I.; Smirnov, D.; Kakuee, O. R.; Rahighi, J. (American Physical Society, 2011)
Experimental results of the elastic scattering of 6He on 208Pb at ELAB = 22 MeV, measured at the CRC facility (Louvain-la-Neuve, Belgium), are presented, including results on the 4He production channel. These data were taken ... -
Entanglement in shape phase transitions of coupled molecular benders
Calixto, M.; Pérez Bernal, Francisco (American Physical Society, 2014)
We study the entanglement properties of the shape phase transitions between different geometric limits of two coupled equivalent molecular benders modeled with the two-dimensional limit of the vibron model. This system ...
