27 documents found, page 1 of 3
Tensor coupling and pseudospin symmetry in nuclei
Alberto, P.; Lisboa, R.; Malheiro, M.; De Castro, A. S. [UNESP]Made available in DSpace on 2022-04-28T19:59:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-01-01; In this work we study the contribution of the isoscalar tensor coupling to the realization of pseudospin symmetry in nuclei. Using realistic values for the tensor coupling strength, we show that this coupling reduces noticeably the pseudospin splittings, especially for single-particle levels near the Fe...
Relating pseudospin and spin symmetries through charge conjugation and chiral t...
Castro, A. S. De [UNESP]; Alberto, P.; Lisboa, R.; Malheiro, M.Made available in DSpace on 2022-04-28T20:07:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-01-01; We solve the generalized relativistic harmonic oscillator in 1+1 dimensions, i.e., including a linear pseudoscalar potential and quadratic scalar and vector potentials which have equal or opposite signs. We consider positive and negative quadratic potentials and discuss in detail their bound-state solut...
Pseudospin and spin symmetries in the Dirac equation for confining potentials w...
De Castro, A. S. [UNESP]; Castro, L. B.; Alberto, P.Made available in DSpace on 2022-04-28T19:00:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-01-01; In this paper, we revise the main features of pseudospin and spin symmetries of the Dirac equation with scalar and vector potentials and mention several of its applications to strong interacting physical systems. We present some recent results in which these symmetries are applied to Coulomb potentials ...
General spin and pseudospin symmetries of the Dirac equation
Alberto, P.; Malheiro, M.; Frederico, T.; De Castro, A. [UNESP]Made available in DSpace on 2022-04-28T19:02:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-12-31; In the 1970s Smith and Tassie [G. B. Smith and L. J. Tassie, Ann. Phys. (NY) 65, 352 (1971)APNYA60003-491610.1016/0003-4916(71)90172-2] and Bell and Ruegg [J. S. Bell and H. Ruegg, Nucl. Phys. B 98, 151 (1975)NUPBBO0550-321310.1016/0550-3213(75)90206-0; J. S. Bell and H. Ruegg, Nucl. Phys. B 104, 546 (1...
Spin and pseudospin symmetries in the antinucleon spectrum of nuclei
Lisboa, R.; Malheiro, M.; Alberto, P.; Fiolhais, M.; De Castro, A. S. [UNESP]Made available in DSpace on 2022-04-28T21:02:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-28; Spin and pseudospin symmetries in the spectra of nucleons and antinucleons are studied in a relativistic mean-field theory with scalar and vector Woods-Saxon potentials, in which the strength of the latter is allowed to change. We observe that, for nucleons and antinucleons, the spin symmetry is of pert...
Pseudospin symmetry and the relativistic harmonic oscillator
Lisboa, R.; Malheiro, M.; de Castro, A. S. [UNESP]; Alberto, P.; Fiolhais, M.Made available in DSpace on 2022-04-29T08:14:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-01-01; A generalized relativistic harmonic oscillator for spin 1/2 particles is studied. The Dirac Hamiltonian contains a scalar [Formula Presented] and a vector [Formula Presented] quadratic potentials in the radial coordinate, as well as a tensor potential [Formula Presented] linear in [Formula Presented]. S...
Spin and pseudospin symmetries in the Dirac equation with central Coulomb poten...
De Castro, A. S. [UNESP]; Alberto, P.Made available in DSpace on 2022-04-29T04:59:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-09-28; We analyze in detail the analytical solutions of the Dirac equation with scalar S and vector V Coulomb radial potentials near the limit of spin and pseudospin symmetries (i.e., when those potentials have the same magnitude and either the same sign or opposite signs, respectively). By performing an expan...
Tooling4G – Minimize the Airflow Generated Noise on Automotive HVAC Systems
Caseiro, J. F.; Alberto, P.The main goal of this work is to assess the gain that can be obtained when considering High-Performance Computing (HPC) for solving complex industrial problems. To that end, a Heat, Ventilation and Air Conditioning (HVAC) system of an automobile is analysed by means of an Aero-Acoustic Computational Fluid Dynamics (CFD) analysis. The performances of the HPC Navigator from the University of Coimbra and a researc...
Spin in a planar relativistic fermion problem
Castro, A. S. de [UNESP]; Alberto, P.Made available in DSpace on 2021-06-25T15:04:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-07-19; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); In this work we seek to clarify the role of spin in a quantum relativistic two-dimensional world. To this end, we solve the Dirac equation for two-dimensional motion with ...
Antinucleon spectra in the Dirac equation with scalar and vector Wood-Saxon pot...
Lisboa, R.; Malheiro, M.; Alberto, P.; Castro, A. S. de [UNESP]; Guimaraes, V; BrandaoDeOliveira, JR; Macario, KCD; Genezini, F. A.Made available in DSpace on 2020-12-10T16:35:02Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-01-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); We analyze here the spin and pseudospin symmetry for the antinucleon spectra solving the Dirac equation with scalar and vector Wood-Saxon potentials. In relativistic nucle...