32,090 research outputs found
Doublet bands in Cs in the triaxial rotor model coupled with two quasiparticles
The positive parity doublet bands based on the configuration in Cs have been investigated in the two
quasi-particles coupled with a triaxial rotor model. The energy spectra ,
energy staggering parameter , and
values, intraband ratios,
ratios, and orientation of the
angular momentum for the rotor as well as the valence proton and neutron are
calculated. After including the pairing correlation, good agreement has been
obtained between the calculated results and the data available, which supports
the interpretation of this positive parity doublet bands as chiral bands.Comment: Phys.Rev.C (accepted
Condensates induced by interband coupling in a double-well lattice
We predict novel inter-band physics for bosons in a double-well lattice. An
intrinsic coupling between the s and px band due to interaction gives rise to
larger Mott regions on the phase diagram at even fillings than the ones at odd
fillings. On the other hand, the ground state can form various types of
condensates, including a mixture of single-particle condensates of both bands,
a mixture of a single-particle condensate of one band and a pair-condensate of
the other band, and a pair-condensate composed of one particle from one band
and one hole from the other band. The predicted phenomena should be observable
in current experiments on double-well optical lattices.Comment: Published versio
Interaction-induced excited-band condensate in a double-well optical lattice
We show theoretically that interaction effects in a double-well optical
lattice can induce condensates in an excited band. For a symmetric double-well
lattice, bosons condense into the bottom of the excited band at the edge of the
Brillouin Zone if the chemical potential is above a critical value. For an
asymmetric lattice, a condensate with zero momentum is automatically induced in
the excited band by the condensate in the lowest band. This is due to a
combined effect of interaction and lattice potential, which reduces the band
gap and breaks the inversion symmetry. Our work can be generalized to a
superlattice composed of multiple-well potentials at each lattice site, where
condensates can be induced in even higher bands.Comment: 4pages, 3 figure
Chiral bands for quasi-proton and quasi-neutron coupling with a triaxial rotor
A particle rotor model (PRM) with a quasi-proton and a quasi-neutron coupled
with a triaxial rotor is developed and applied to study chiral doublet bands
with configurations of a proton and a quasi-neutron. With
pairing treated by the BCS approximation, the present quasi-particle PRM is
aimed at simulating one proton and many neutron holes coupled with a triaxial
rotor. After a detailed analysis of the angular momentum orientations, energy
separation between the partner bands, and behavior of electromagnetic
transitions, for the first time we find aplanar rotation or equivalently chiral
geometry beyond the usual one proton and one neutron hole coupled with a
triaxial rotor.Comment: 25 pages, 10 figures, accepted for publication in Physical Review
Chiral geometry of higher excited bands in triaxial nuclei with particle-hole configuration
The lowest six rotational bands have been studied in the particle-rotor model
with the particle-hole configuration
and different triaxiality parameter . Both constant and spin-dependent
variable moments of inertial (CMI and VMI) are introduced. The energy spectra,
electromagnetic transition probabilities, angular momentum components and
-distribution have been examined. It is shown that, besides the band 1 and
band 2, the predicted band 3 and band 4 in the calculations of both CMI and VMI
for atomic nuclei with could be interpreted as chiral doublet
bands.Comment: 4 pages, 4 figure
Candidate MKiD nucleus 106Rh in triaxial relativistic mean-field approach with time-odd fields
The configuration-fixed constrained triaxial relativistic mean-field approach
is extended by including time-odd fields and applied to study the candidate
multiple chiral doublets (MKiD) nucleus 106Rh. The energy contribution from
time-odd fields and microscopical evaluation of center-of-mass correction as
well as the modification of triaxial deformation parameters beta, gamma due to
the time-odd fields are investigated. The contributions of the time-odd fields
to the total energy are 0.1-0.3 MeV and they modify slightly the gamma values.
However, the previously predicted multiple chiral doublets still exist.Comment: 9 pages, 3 figures, accepted for publication as a Brief Report in
Physical Review
Monotonicity results and bounds for the inverse hyperbolic sine
In this note, we present monotonicity results of a function involving to the
inverse hyperbolic sine. From these, we derive some inequalities for bounding
the inverse hyperbolic sine.Comment: 3 page
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