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We show that the conditions which originate the spin and pseudospin symmetries in the Dirac equation are the same that produce equivalent energy spectra of relativistic spin-1/2 and spin-0 particles… (More)

- Pedro Alberto, Fernando Nogueira, Humberto Rocha, Luís N. Vicente
- SIAM Journal on Optimization
- 2004

This paper deals with the application of pattern search methods to the numerical solution of a class of molecular geometry problems with important applications in molecular physics and chemistry. The… (More)

The problem of a relativistic spin 1 /2 particle confined to a one-dimensional box is solved in a way that resembles closely the solution of the well known quantum-mechanical textbook problem of a… (More)

- Pedro Alberto, Manuel Fiolhais, Manuel Malheiro, Antonio Delfino, M. Chiapparini
- Physical review letters
- 2001

Pseudospin symmetry in nuclei is investigated considering the Dirac equation with a Lorentz structured Woods-Saxon potential. The isospin correlation of the energy splittings of pseudospin partners… (More)

- Pedro Alberto, Manuel Fiolhais, B. Golli, Jamile Sabatini Marques
- 2001

The Roper resonance is described in a chiral version of the chromodielectric model as a cluster of three quarks in radial-orbital configuration (1s)2(2s)1, surrounded by π and σ-meson clouds and by a… (More)

We investigate the isospin dependence of pseudospin symmetry in the chain of tin isotopes (from Sn until Sn). Using a Woods-Saxon parametrization of the nuclear potential for these isotopes we study… (More)

Pedro Alberto , Saurya Das , and Elias C. Vagenas 3‡ Departamento de F́ısica and Centro de F́ısica Computacional, Universidade de Coimbra, P-3004-516 Coimbra, Portugal Theoretical Physics Group, Dept… (More)

- L. Amoreira, Pedro Alberto, Manuel Fiolhais
- 2000

The multipole amplitudes for the N – ∆(1232) electromagnetic transition are computed in the framework of the linear σ model and the chiral chromodielectric model for small and moderate photon… (More)

- É., Pedro Alberto, Klaus Goeke, José Urbano
- 1993

We investigate the solitonic sector of the massive Yang-Mills Lagrangian including tr-, ~r-, to-, p-, A-mesons as well as valence quarks and apply it to the calculation of some baryonic properties.… (More)

- Pedro Alberto
- 2002

The P11(1440) (Roper) resonance 1 is the lowest positive-parity N state, most clearly visible in partial-wave decompositions of πN → πN and πN → ππN scattering, as well as in pion photoproduction.… (More)