30,678 research outputs found
Prediction of deviations from the Rutherford formula for low-energy Coulomb scattering of wavepackets
We calculate the nonrelativistic scattering of a wavepacket from a Coulomb
potential and find deviations from the Rutherford formula in all cases. These
generally occur only at low scattering angles, where they would be obscured by
the part of the incident beam that emerges essentially unscattered. For a model
experiment, the scattering of helium nuclei from a thin gold foil, we find the
deviation region is magnified for low incident energies (in the keV range), so
that a large shadow zone of low probability around the forward direction is
expected to be measurable.
From a theoretical perspective, the use of wavepackets makes partial wave
analysis applicable to this infinite-range potential. It allows us to calculate
the everywhere finite probability for a wavepacket to wavepacket transition and
to relate this to the differential cross section. Time delays and advancements
in the detection probabilities can be calculated. We investigate the optical
theorem as applied to this special case.Comment: 21 pages, 8 figures. This version contains clarifications and
additional results compared to the previous version. The paper has been
accepted for publication in J.Phys.
Cloudphysical Parameters in Dependence on Height above Cloud Base in Different Clouds.
On flights with the DLR icing research aircraft the dependence of aircraft icing on cloudphysical parameters was determined; both for aircraft-referred icing and for normalized icing, as well as for various clouds and locations in clouds. This is done with an improvement of icing predicitons in mind. The species of the cloud and the distance from cloud base are called here cloud parameters; while under cloudphysical parameters are understood liquid water content, temperature, particle size distribution and particle phase. Results from four icing flights are discussed, selected from a total of forty vertical soundings. —The results are arranged in four classes: Stratus/cumulus mixed, stratus; with and without precipitation at the ground
Introduction to the Tenth Anniversary issue of the \u3cem\u3e Journal of Health Care Law & Policy \u3c/em\u3e
Hello, Goodbye. Bertelsmann Stiftung eupinions brief | January 2020
As the United Kingdom is leaving the European Union all eyes are on the eminent
economic effects and future trade negotiations. How the British people feel about
the state of their country at this defining moment of their political history has
received less attention. In this eupinions brief, we examine how British citizens
evaluate the state of their national democracy and the direction of their home
country. We also ask what they expect for their personal lives
We’ll be fine. How People in the EU27 View Brexit. eupinions brief | February 2019
The political drama called Brexit leaves observers in London fascinated, appalled
or exhausted. Whereas in the UK, the tension seems to intensify with every twist
and turn the British take on their way out of the European Union, Europeans on the
continent seem to be surprisingly detached. They support their country’s
membership in the EU in ever greater numbers, and calmly carry on with their daily
business. Don’t they think that they will be affected by Brexit? We decided to ask
the
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