5,488 research outputs found
Simple function forms and nucleon-nucleus total cross sections
Total cross sections for neutron scattering with energies between 10 and 600
MeV and from nine nuclei spanning the mass range from 6Li to 238U have been
analyzed using a simple function of three parameters. The values of those
parameters with which neutron total cross section data are replicated vary
smoothly with energy and target mass and may themselves be represented by
functions of energy and mass.Comment: 15 pages, 9 figure
Magneto-optical Feshbach resonance: Controlling cold collision with quantum interference
We propose a method of controlling two-atom interaction using both magnetic
and laser fields. We analyse the role of quantum interference between magnetic
and optical Feshbach resonances in controlling cold collision. In particular,
we demonstrate that this method allows us to suppress inelastic and enhance
elastic scattering cross sections. Quantum interference is shown to modify
significantly the threshold behaviour and resonant interaction of ultracold
atoms. Furthermore, we show that it is possible to manipulate not only the
spherically symmetric s-wave interaction but also the anisotropic higher
partial-wave interactions which are particularly important for high temperature
superfluid or superconducting phases of matter.Comment: 7 pages 3 figures, some minor errors are corrected, Accepted in J.
Phys.
A simple functional form for proton-Pb total reaction cross sections
A simple functional form has been found that gives a good representation of
the total reaction cross sections for the scattering from Pb of
protons with energies in the range 30 to 300 MeV.Comment: 7 pages, 2 figure
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