نتایج جستجو برای: energy elementary particle interaction
تعداد نتایج: 1363230 فیلتر نتایج به سال:
According to modern physics, the mediators for all the fundamental forces of nature have spin S ≤ 2: photon for electrodynamics (S = 1), gluons for strong interactions (S = 1), bosons for the weak force (S = 1) and gravitons for the gravitational force (S = 2). Why? We show that the demand that the equations of a fundamental field are consistent in the classical limit (when quantum effects are ...
We review the software tools and models used in High Energy Physics to describe elementary particle interactions, with emphasis on those which would be most appropriate for application to the field of Cosmic Ray Physics. We discuss the standard Monte Carlo programs in common use and various specialised modifications, ranging from the modelling of very high energy interactions to softer processe...
چکیده ندارد.
Bose-Einstein correlations and invariant momentum distributions are analyzed for longitudinally expanding finite systems, like jets in elementary particle collisions or systems created in high energy heavy ion reactions.
The occurrence of heterogeneous flow structures in gas-particle flows seriously affects the gas-solid contacting and transport processes in high-velocity gas-fluidized beds. Particles do not disperse uniformly in the flow but pass through the bed in a swarm of clusters. The so-called “core-annulus” structure in the radial direction and “S” shaped axial distribution of solids concentration chara...
We consider the ground state of a bilayer system of dipolar bosons, where dipoles are oriented by an external field in the direction perpendicular to the parallel planes. Quantum Monte Carlo methods are used to calculate the ground-state energy, the one-body and two-body density matrix, and the superfluid response as a function of the separation between layers. We find that by decreasing the in...
چکیده ندارد.
We present the first results using the Reuven Ramaty High-Energy Solar Spectroscopic Imager, RHESSI, to observe solar X-ray emission not associated with active regions, sunspots or flares (the quiet Sun). Using a newly developed chopping technique (fan-beam modulation) during seven periods of offpointing between June 2005 to October 2006, we obtained upper limits over 3-200 keV for the quietest...
This article concerns a phenomenon of elementary quantum mechanics that is quite counter-intuitive, very non-classical, and apparently not widely known: a quantum particle can get reflected at a potential step downwards. In contrast, classical particles get reflected only at upward steps. As a consequence, a quantum particle can be trapped for a long time (though not forever) in a region surrou...
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