3,506 research outputs found
Halos in medium-heavy and heavy nuclei with covariant density functional theory in continuum
The covariant density functional theory with a few number of parameters has
been widely used to describe the ground-state and excited-state properties for
the nuclei all over the nuclear chart. In order to describe exotic properties
of unstable nuclei, the contribution of the continuum and its coupling with
bound states should be treated properly. In this Topical Review, the
development of the covariant density functional theory in continuum will be
introduced, including the relativistic continuum Hartree-Bogoliubov theory, the
relativistic Hartree-Fock-Bogoliubov theory in continuum, and the deformed
relativistic Hartree-Bogoliubov theory in continuum. Then the descriptions and
predictions of the neutron halo phenomena in both spherical and deformed nuclei
will be reviewed. The diffuseness of the nuclear potentials, nuclear shapes and
density distributions, and the impact of the pairing correlations on nuclear
size will be discussed.Comment: 63 pages; Topical Review, J. Phys. G (in press
Electroosmotic Flow Pump
Electroosmotic flow (EOF) pumping has been widely used to manipulate fluids such as liquid sample reagents in microfluidic systems. In this chapter, we will introduce the research progress on EOF pumps in the fields of microfluidic science and technology and briefly present their microfluidic applications in recent years. The chapter focuses on pump channel materials, electrodes, and their fabrication techniques in microfluidics
Microscopic and self-consistent description for neutron halo in deformed nuclei
A deformed relativistic Hartree-Bogoliubov theory in continuum has been
developed for the study of neutron halos in deformed nuclei and the halo
phenomenon in deformed weakly bound nuclei is investigated. Magnesium and neon
isotopes are studied and some results are presented for the deformed
neutron-rich and weakly bound nuclei 44Mg and 36Ne. The core of the former
nucleus is prolate, but the halo has a slightly oblate shape. This indicates a
decoupling of the halo orbitals from the deformation of the core. The generic
conditions for the existence of halos in deformed nuclei and for the occurrence
of this decoupling effect are discussed.Comment: 7 pages, 2 figures; invited talk at the XXXV Brazilian Workshop on
Nuclear Physics, Sep 2-6, 2012, Maresias, Brazi
Halos in a deformed Relativistic Hartree-Bogoliubov theory in continuum
In this contribution we present some recent results about neutron halos in
deformed nuclei. A deformed relativistic Hartree-Bogoliubov theory in continuum
has been developed and the halo phenomenon in deformed weakly bound nuclei is
investigated. These weakly bound quantum systems present interesting examples
for the study of the interdependence between the deformation of the core and
the particles in the halo. Magnesium and neon isotopes are studied and detailed
results are presented for the deformed neutron-rich and weakly bound nuclei
42Mg. The core of this nucleus is prolate, but the halo has a slightly oblate
shape. This indicates a decoupling of the halo orbitals from the deformation of
the core. The generic conditions for the existence of halos in deformed nuclei
and for the occurrence of this decoupling effect are discussed.Comment: 6 pages, 2 figures; invited talk at the 2nd Int. Conf. on Nuclear
Structure & Dynamics (NSD12), Opatija, Croatia, 9-13 July 201
Deformed relativistic Hartree-Bogoliubov model for exotic nuclei
A deformed relativistic Hartree-Bogoliubov (DRHB) model is developed aiming
at a proper description of exotic nuclei, particularly deformed ones with large
spatial extension. In order to give an adequate description of both the
contribution of the continuum and the large spatial distribution in exotic
nuclei, the DRHB equations are solved in a Woods-Saxon basis in which the
radial wave functions have proper asymptotic behaviors at large distance from
the nuclear center which is crucial for the formation of halo. The formalism
and the numerical procedure of the DRHB model in a Woods-Saxon basis are
briefly presented.Comment: 7 pages, 1 EPS figure; to be published by World Scientific Publisher
in the Proceedings of International Symposium on the Physics of Unstable
Nuclei (ISPUN07), Jul. 3-7, 2007, Hoi An, Vietna
Nuclear superfluidity for antimagnetic rotation in Cd and Cd
The effect of nuclear superfluidity on antimagnetic rotation bands in
Cd and Cd are investigated by the cranked shell model with the
pairing correlations and the blocking effects treated by a particle-number
conserving method. The experimental moments of inertia and the reduced
transition values are excellently reproduced. The nuclear superfluidity is
essential to reproduce the experimental moments of inertia. The two-shears-like
mechanism for the antimagnetic rotation is investigated by examining the shears
angle, i.e., the closing of the two proton hole angular momenta, and its
sensitive dependence on the nuclear superfluidity is revealed.Comment: 14 pages, 4 figure
Pseudospin symmetry and its approximation in real nuclei
The origin of pseudospin symmetry and its broken in real nuclei are discussed
in the relativistic mean field theory. In the exact pseudospin symmetry, even
the usual intruder orbits have degenerate partners. In real nuclei, pseudospin
symmetry is approximate, and the partners of the usual intruder orbits will
disappear. The difference is mainly due to the pseudo spin-orbit potential and
the transition between them is discussed in details. The contribution of
pseudospin-orbit potential for intruder orbits is quite large, compared with
that for pseudospin doublets. The disappearance of the pseudospin partner for
the intruder orbit can be understood from the properties of its wave function.Comment: 10 pages, 3 figure
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