43,584 research outputs found
Sea flavor content of octet baryons and intrinsic five-quark Fock states
Sea quark contents of the octet baryons are investigated by employing an
extended chiral constituent quark approach, which embodies higher Fock
five-quark components in the baryons wave-functions. The well-known flavor
asymmetry of the nucleon sea , is used as input to predict the
probabilities of , and in the nucleon, ,
and baryons, due to the intrinsic five-quark components in the
baryons wave functions.Comment: 22 page
Strong decays of in an extended chiral quark model
The strong decays of the resonance are investigated in an
extended chiral quark model by including the low-lying components
in addition to the component. The results show that these five-quark
components in contribute significantly to the and decays. The contributions to the decay
come from both the lowest energy and the next-to-lowest energy five-quarks
components, while the contributions to the decay come from only the
latter one. Taking these contributions into account, the description for the
strong decays of is improved, especially, for the puzzling large
ratio of the decays to and .Comment: 6 pages, 1 figur
Entanglement enhancement and postselection for two atoms interacting with thermal light
The evolution of entanglement for two identical two-level atoms coupled to a
resonant thermal field is studied for two different families of input states.
Entanglement enhancement is predicted for a well defined region of the
parameter space of one of these families. The most intriguing result is the
possibility of probabilistic production of maximally entangled atomic states
even if the input atomic state is factorized and the corresponding output state
is separable.Comment: accepted for publication in J. Phys.
The future design direction of smart clothing development
Literature indicates that Smart Clothing applications, the next generation of clothing and
electronic products, have been struggling to enter the mass market because the consumersâ
latent needs have not been recognised. Moreover, the design direction of Smart Clothes
remains unclear and unfocused. Nevertheless, a clear design direction is necessary for all
product development. Therefore, this research aims to identify the design directions of the
emerging Smart Clothes industry by conducting a questionnaire survey and focus groups
with its major design contributors. The results reveal that the current strategy of embedding
a wide range of electronic functions in a garment is not suitable. This is primarily because it
does not match the usersâ requirements, purchasing criteria and lifestyle. The results
highlight the respondentsâ preference for personal healthcare and sportswear applications
that suit their lifestyle, are aesthetically attractive, and provide a practical function
One Dimensional Magnetized TG Gas Properties in an External Magnetic Field
With Girardeau's Fermi-Bose mapping, we have constructed the eigenstates of a
TG gas in an external magnetic field. When the number of bosons is
commensurate with the number of potential cycles , the probability of this
TG gas in the ground state is bigger than the TG gas raised by Girardeau in
1960. Through the comparison of properties between this TG gas and Fermi gas,
we find that the following issues are always of the same: their average value
of particle's coordinate and potential energy, system's total momentum,
single-particle density and the pair distribution function. But the reduced
single-particle matrices and their momentum distributions between them are
different.Comment: 6 pages, 4 figure
A side-by-side comparison of Daya Bay antineutrino detectors
The Daya Bay Reactor Neutrino Experiment is designed to determine precisely the neutrino mixing angle Ξ_(13) with a sensitivity better than 0.01 in the parameter sin^22Ξ_(13) at the 90% confidence level. To achieve this goal, the collaboration will build eight functionally identical antineutrino detectors. The first two detectors have been constructed, installed and commissioned in Experimental Hall 1, with steady data-taking beginning September 23, 2011. A comparison of the data collected over the subsequent three months indicates that the detectors are functionally identical, and that detector-related systematic uncertainties are smaller than requirements
Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies
Nucleon-nucleon (NN) cross sections are evaluated in neutron-rich matter
using a scaling model according to nucleon effective masses. It is found that
the in-medium NN cross sections are not only reduced but also have a different
isospin dependence compared with the free-space ones. Because of the
neutron-proton effective mass splitting the difference between nn and pp
scattering cross sections increases with the increasing isospin asymmetry of
the medium. Within the transport model IBUU04, the in-medium NN cross sections
are found to influence significantly the isospin transport in heavy-ion
reactions. With the in-medium NN cross sections, a symmetry energy of
was found most acceptable
compared with both the MSU isospin diffusion data and the presently acceptable
neutron-skin thickness in Pb. The isospin dependent part of isobaric nuclear incompressibility was further narrowed down to
MeV. The possibility of determining simultaneously the in-medium
NN cross sections and the symmetry energy was also studied. The proton
transverse flow, or even better the combined transverse flow of neutrons and
protons, can be used as a probe of the in-medium NN cross sections without much
hindrance from the uncertainties of the symmetry energy.Comment: 32 pages including 14 figures. Submitted to Phys. Rev.
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