3,310 research outputs found
On the nuclear dependence of the mu-e conversion branching ratio
The variation of the coherent branching ratio (ratio of the
reaction rate divided by the total muon-capture rate) through
the periodic table is studied by using exact muon wave functions. It was found
that, by using very heavy nuclei (e.g. \nuc{197}Au, the SINDRUM II target) as
conversion stopping-targets, the above ratio is favored by a
factor of about four to five than by using light ones (e.g. \nuc{48}Ti, chosen
as PRIME target).Comment: 7 pages, 1 Figure NIM Phys. Res., submitte
Fake switch points
Based on C.Bidard’s and E.Klimovsky’s “Switches and Fake switches in methods of production”, an attempt will be made to show if fake switch points (as named) are in fact, and opposite of what Bidard and Klimovsky claim, real switch points.Fake switch points, Choice of Techniques, Input-Output Models
B-quark mediated neutrinoless conversion in presence of R-parity violation
We found that in supersymmetric models with R-parity non-conservation the
b-quarks may appreciably contribute to exotic neutrinoless muon-electron
conversion in nuclei via the triangle diagram with two external gluons. This
allowed us to extract previously overlooked constraints on the third generation
trilinear R-parity violating parameters significantly more stringent than those
existing in the literature.Comment: 6 pages, 1 figur
Choosing techniques or typical subsystems instead? A PhD thesis
This paper deals with the problem of choosing techniques. When we refer to the problem of choosing techniques, we actually refer to choose from a set of given production processes-techniques -according to a specific criterion- the optimum one. The criteria which are going to be presented are the w-r criterion, the cost minimization criterion, the Bidard’s algorithm and the -so called- John von Neumann’s criterion. Based on the usual neo-Ricardian assumptions for the linear production techniques, we try to figure out whether a comparison of the above techniques is possible according to any of the above criteria. The main conclusion of this paper is that it is impossible in either a neoclassical, or a neo-Ricardian “world” to choose or to rank a technique between others, according to any of the above criteriaeven in the special case of the non decomposable single production techniques. We are confident that it is possible to rank univocally the techniques in the case of corn and charasoffian economies, and of course in an economy a ℓa von Neumann. We conclude that in fact we do not compare or choose techniques but typical systems instead.Choice of techniques, Input- Output models, criteria of choice
Simulations of Gamma-ray emission from magnetized micro-quasar jets
In this work, we simulate -rays created in the hadronic jets of the
compact object in binary stellar systems known as microquasars. We utilize as
main computational tool the -D relativistic magneto-hydro-dynamical code
PLUTO combined with in house derived codes. Our simulated experiments refer to
the SS433 X-ray binary, a stellar system in which hadronic jets have been
observed. We examine two new model configurations that employ hadron-based
emission mechanisms. The simulations aim to explore the dependence of the
-ray emissions on the dynamical as well as the radiative properties of
the jet (hydrodynamic parameters of the mass-flow density, gas-pressure,
temperature of the ejected matter, high energy proton population inside the jet
plasma, etc.). The results of the two new scenarios of initial conditions for
the micro-quasar stellar system studied, are compared to those of previously
considered scenarios.Comment: 13 pages, 8 figures, 1 tabl
The Bose-Hubbard model with localized particle losses
We consider the Bose-Hubbard model with particle losses at one lattice site.
For the non-interacting case, we find that half of the bosons of an initially
homogeneous particle distribution, are not affected by dissipation that only
acts on one lattice site in the center of the lattice. A physical
interpretation of this result is that the surviving particles interfere
destructively when they tunnel to the location of the dissipative defect and
therefore never reach it. Furthermore we find for a one-dimensional model that
a fraction of the particles can propagate across the dissipative defect even if
the rate of tunneling between adjacent lattice sites is much slower than the
loss rate at the defect. In the interacting case, the phase coherence is
destroyed and all particles eventually decay. We thus analyze the effect of
small interactions and small deviations from the perfectly symmetric setting on
the protection of the particles against the localized losses. A possible
experimental realization of our setup is provided by ultracold bosonic atoms in
an optical lattice, where an electron beam on a single lattice site ionizes
atoms that are then extracted by an electrostatic field.Comment: 10 pages, 5 figures, minor revisions to previous versio
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