3,346 research outputs found
Relativistic symmetry breaking in light kaonic nuclei
As the experimental data from kaonic atoms and scatterings imply
that the -nucleon interaction is strongly attractive at saturation
density, there is a possibility to form -nuclear bound states or kaonic
nuclei. In this work, we investigate the ground-state properties of the light
kaonic nuclei with the relativistic mean field theory. It is found that the
strong attraction between and nucleons reshapes the scalar and vector
meson fields, leading to the remarkable enhancement of the nuclear density in
the interior of light kaonic nuclei and the manifest shift of the
single-nucleon energy spectra and magic numbers therein. As a consequence, the
pseudospin symmetry is shown to be violated together with enlarged spin-orbit
splittings in these kaonic nuclei.Comment: 15 pages, 7 figure
Dynamic Evolution of SS at the Oxygen Evolving Complex with the Spin Marker under the Photoelectric Polarization
Water oxidation in the oxygen evolving complex (OEC) of the photosystem II is
catalyzed by the core cluster CaMnO which was projected to experience
five intermediate states S() in the Kok's cycle since 1970's. However,
the detailed dynamics of state evolutions still remains unclear, albeit with
the general fact that the process is initiated by the transfer of
photoelectrons with the steady electron donors of the water molecules. Based on
density functional simulations, we find that the spin flips of Manganese atoms
between the consecutive states in the electric polarization field can be used
as a marker to uncover the intricate dynamic evolutions and the underlying
dynamics. The dynamic electron and proton transfers and water insertion and
dissociation are traced to reveal the evolution pathways of SS
with commensurate spin flips towards the exact spin configuration of the next
state. In particular, the various water insertions and dissociations at
coordination sites of the S open and closed cubane isomers are predicted
with constraints on the necessary spin flips. Our study lays a solid ground for
getting through the whole Kok's cycle via the pending S state that is
crucial for dioxygen generation.Comment: 8 pages, 5 figure
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