Results 241 to 250 of about 334,293 (293)

Nucleon-Antinucleon Optical Potential

Physical Review Letters, 1982
A model has been constructed for nucleon-antinucleon annihilation which is of short range but is state (energy, spin, isospin, ...) dependent as dictated by the calculation of annihilation diagrams. This model fulfills general theoretical requirements and, at the same time, provides a good fit of the presently available pp-bar experimental data; better
Cote, J., Lacombe, M., Loiseau, B., Moussallam, B., Vinh Mau, R.   +4 more
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Confining optical potentials

Journal of Mathematical Physics, 1986
The possibility of confining a quantum particle in an optical potential, the imaginary part of which would be related to the existence of inelastic reaction channels coupled to the elastic one, is considered. Pure imaginary potentials of various (constant, linear, and parabolic) radial shapes are studied.
F. J. Gomez, M. F. Rañada, J. Sesma
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Causality with noncausal optical potentials

Physical Review C, 1995
It is shown by way of a simplified model that the calculation of the time nonlocal potential resulting from an energy-dependent optical potential is not unique. Most choices result in a noncausal time-dependent potential, in spite of the inclusion of appropriate scattering boundary conditions in the model.
, Madsen, , Goldman
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Potential mapping of optical tweezers

Optics Letters, 2011
Optical tweezers are very often used for measurement of piconewton range forces. Depending on the displacement of the trapped bead, the trap may become stiffer which causes considerable underestimation of the measured force. We have shown, both by theory and experiment, that such a stiffening occurs for beads larger than 0.5 μm in radius. For the first
Tahmineh, Godazgar, Rouzbeh, Shokri, S Nader S, Reihani   +2 more
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Phenomenological optical potentials

The European Physical Journal Plus, 2018
In this paper a “pedagogical” description of the scattering of two colliding nuclei is given. Some essential concepts are introduced, like the cross-section definition and the basic ingredients of scattering theory, which are preparatory for the discussion on the optical model. Phenomenological optical potentials are described, like the Woods-Saxon and
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Optical measurement of membrane potential

1978
Optical measurement of membrane potential is a new tool for physiologists and has already found many applications. However, the number of possible pitfalls is alarming, particularly in situations where comparison with electrode measurements is impossible.
L B, Cohen, B M, Salzberg
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Optical probes of membrane potential

The Journal of Membrane Biology, 1976
There are two basically different mechanisms for the fluorescence and absorption changes of merocyanine, cyanine and oxonol dyes. The permeant dyes (cyanine and oxonol dyes, with delocalized charges) work by a potential-dependent accumulation mechanism. These dyes show large (up to 80%) fluorescence and absorption changes with suspensions of cells, and
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Pion-deuteron optical potential

Physical Review C, 1981
The three-body approach to the single-scattering optical potential proposed by Tandy, Redish, and Bolle is tested in the context of ..pi..-d scattering where the various approximations are compared with the exact solution of the Faddeev equations. For ..pi..-d scattering we find that the integral equations derived for the Kerman-McManus-Thaler form of ...
I. R. Afnan, A. T. Stelbovics
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Optical MEMS potentials in optical storage

1998 IEEE/LEOS Summer Topical Meeting. Digest. Broadband Optical Networks and Technologies: An Emerging Reality. Optical MEMS. Smart Pixels. Organic Optics and Optoelectronics (Cat. No.98TH8369), 2002
To compete with this steady increase in capacity and performance at relatively fixed cost, new approaches are being pursued to increase the capacity and performance of optical disk storage products. Micromachining technologies will play an important role in these new systems.
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Optical nucleon-deuteron potential

Physical Review C, 1997
Nucleon-deuteron scattering is cast into the form of an optical potential formalism. Two forms of an optical potential are given. The resulting integral equations for the optical potentials are approximated by the first two leading terms. Our numerical results demonstrate that even at intermediate energies these approximations are insufficient to cover
J. Kuroś, H. Witała, W. Glöckle, J. Golak, D. Hüber, H. Kamada   +5 more
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