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Questions related to Particle Physics
P=aD (power law that power is 1) that means larger particle have higher penetration through something. The nanoparticle size is between 20-500 nm.
02 February 2015 8,873 1 View
Neutrino flavor oscillations are often described as involving a mass/energy change. The flavor oscillation is also described as the result of a superposition of mass eigenstates which propagate at...
02 February 2015 5,144 18 View
I mean that they are accelerating protons, neutrons and lead ions at very high speeds and that is very similar to an atomic bomb explosion. Are there cases of cancers in technicians, engineers and...
02 February 2015 9,118 7 View
I can´t find anything other than the standard expression valid BEFORE recombination which does not depend on the ionization fraction, or expressions for AFTER the precipitous fall in the sound...
02 February 2015 1,495 3 View
suppose that we are pushing two fermions strongly together. As we know, Pauli exclusion principle doesn't let those particles occupy the same place. but is that "repulsion" (if it is possible to...
02 February 2015 2,916 15 View
Einstein's time dilation is determined with t’=t(1-v^2/c^2)^1/2. It is thought that the time dilation is confirmed with that the life of the flying mesons is longer than that at rest. However,...
02 February 2015 2,979 38 View
To the best of my knowledge, because the Dirac equation explains very well the gyromagnetic ratio of the Electron, it is typically considered to be an equation for the Electron. There seems to be...
23 January 2015 5,127 14 View
There is no 0-0 gamma decay because the photon must carry at least 1hbar (its spin) of angular momentum. My question is: Why the orbital angular momentum (L) and spin momentum (S) of the photon...
13 January 2015 9,514 2 View
01 January 2015 6,440 15 View
For instance, in his famous paper "Particle Physics and Inflationary Cosmology " (see hep-th/0503203), Andrej Linde asserts ( see ibid § 9.1) that the deskiy of the p=\rho c^2 matters decreases...
01 January 2015 4,234 7 View
01 January 2015 1,298 2 View
Kaluza–Klein theory is theory which uses 5th dimension to unite Gravity with Electromagnetism. does this theory have any short fall or is it perfect? If someone can help me with original article...
01 January 2015 3,119 7 View
Please someone tell me why is there a difference in the path length of alpha particle in Boron-10 using TRIM and SRIM than the Geant4 Simulation? The path length of alpha particle with energy...
01 January 2015 5,351 6 View
Please someone tell me what is the difference in the Target material of world volume and sensitive detector material of chamber volume of B2 Basic example in Geant4 simulation? I am using...
01 January 2015 1,343 2 View
Owing to particle-wave duality particles have wave nature, and waves have particle nature. Does that mean we can derive their underlining equations from each other, i.e. Maxwell from Dirac and...
01 January 2015 5,449 36 View
Or does it follow the expansion of space (i.e. of the universe)? How to measure it if Planck's length is the space unit?
01 January 2015 3,346 25 View
The photon CAN transfer part of its energy to the electron and continue to exist. An example of this is Compton scattering, where a gamma ray transfers enough energy to the electron to ionize and...
12 December 2014 2,468 6 View
Thanks in advance.
12 December 2014 7,062 14 View
In 1987, astronomers counted 19 neutrinos from an explosion of a star in the nearby Large Magellanic Cloud, 19 out of the billion trillion trillion trillion trillion neutrinos that flew from the...
12 December 2014 3,402 10 View
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12 December 2014 6,358 5 View
I have a doubt regarding String-Net theory. Prof. Xiao-Gang Wen stresses upon the point that all fermions must carry gauge charges. The Standard Model contain composite fermions that are neutral...
12 December 2014 1,827 5 View
It is the function used in high energy physics in heavy ion collision. But I am curious whether or not it can be applied for low energy nuclear physics.
12 December 2014 8,425 3 View
11 December 2014 4,062 9 View
09 December 2014 6,299 4 View