Spin and pseudospin symmetries in the antinucleon spectrum of nuclei

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 perturbative nature and it is almost an exact symmetry in the physical region for antinucleons. The opposite situation is found in the pseudospin symmetry case, which is better realized for nucleons than for antinucleons, but is of dynamical nature and cannot be viewed in a perturbative way both for nucleons and antinucleons. This is shown by computing the spin-orbit and pseudospin-orbit couplings for selected spin and pseudospin partners in both spectra.Comment: 8 figures, uses revtex 4.1 macro

Herborização de orgãos vegetais em condições refrigeradas.

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Características físicas e químicas do látex e crescimento da seringueira em função da calagem e da adubação NPK em dois sistemas de explotação.

Objetivou-se com este estudo avaliar o efeito da calagem e da adubação NPK sobre o crescimento e as características físicas e químicas do látex de seringueiras, com 16 anos de campo, cultivadas no Planalto Ocidental Paulista