18,911 research outputs found
Two-body and three-body substructures served as building blocks in small spin-3 condensates
It was found that stable few-body spin-structures, pairs and triplexes, may
exist as basic constituents in small spin-3 condensates, and they will play the
role as building blocks when the parameters of interaction are appropriate.
Specific method is designed to find out these constituents.Comment: 9 pages, 4 figure
Suppression of thermally activated escape by heating
The problem of thermally activated escape over a potential barrier is solved
by means of path integrals for one-dimensional reaction dynamics with very
general time dependences. For a suitably chosen but still quite simple static
potential landscape, the net escape rate may be substantially reduced by
temporally increasing the temperature above its unperturbed constant level.Comment: 4 pages, 2 figure
The Third Law of Quantum Thermodynamics in the Presence of Anomalous Couplings
The quantum thermodynamic functions of a harmonic oscillator coupled to a
heat bath through velocity-dependent coupling are obtained analytically. It is
shown that both the free energy and the entropy decay fast with the temperature
in relation to that of the usual coupling from. This implies that the
velocity-dependent coupling helps to ensure the third law of thermodynamics.Comment: 4 pages, 3 figures, 22 conference
Deduction of the quantum numbers of low-lying states of 6-nucleon systems based on symmetry
The inherent nodal structures of the wavefunctions of 6-nucleon systems have
been investigated. The existence of a group of six low-lying states dominated
by L=0 has been deduced. The spatial symmetries of these six states are found
to be mainly {4,2} and {2,2,2}.Comment: 8 pages, no figure
Magnetic effects in heavy-ion collisions at intermediate energies
The time-evolution and space-distribution of internal electromagnetic fields
in heavy-ion reactions at beam energies between 200 and 2000 MeV/nucleon are
studied within an Isospin-dependent Boltzmann-Uhling-Uhlenbeck transport model
IBUU11. While the magnetic field can reach about G which is
significantly higher than the estimated surface magnetic field (
G) of magnetars, it has almost no effect on nucleon observables as the Lorentz
force is normally much weaker than the nuclear force. Very interestingly,
however, the magnetic field generated by the projectile-like (target-like)
spectator has a strong focusing/diverging effect on positive/negative pions at
forward (backward) rapidities. Consequently, the differential
ratio as a function of rapidity is significantly altered by the magnetic field
while the total multiplicities of both positive and negative pions remain about
the same. At beam energies above about 1 GeV/nucleon, while the integrated
ratio of total to multiplicities is not, the differential
ratio is sensitive to the density dependence of nuclear symmetry
energy . Our findings suggest that magnetic effects should
be carefully considered in future studies of using the differential
ratio as a probe of the at supra-saturation
densities.Comment: 12 pages including 8 figures and 1 tabl
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