The particles tag has no wiki summary.
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Stability of neutron [duplicate]
Possible Duplicate:
How come neutrons in a nucleus don't decay?
It is known that free neutron decays in 15 minutes on average. Why is it much more stable when "placed" in nuclei?
Edit: ...
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1answer
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why is there no ninth gluon?
A teacher of mine told me once that there were no ninth gluon because such a one should be white and interact infinitely far, and no one has been observed. Is there also a theoretical reason?
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What sources can you recommend to understand the basics of the Coulomb interaction of particles [closed]
Maybe it's not the best place for this issue yet.
I am in graduate school. Field of knowledge of my supervisor - quantum physics - or rather, he examines the interaction of particles. Sources which ...
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0answers
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GUT predictions for charm mass?
Most GUT models have some relationship between down-type quarks and leptons, that more or less agree with the observed values after running the renormalization equations. But, what about up-type ...
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2answers
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Speed Distribution of The Particles
I want to know the distribution of the particles's speed.
The particles what I mean are nucleons and electrons of element.
Consume there is 1kg of iron on room temperature and it's shape is sphere.
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3answers
618 views
What is lepton number?
What exactly is a lepton number of a particle? With the charge (eg proton is just 1, not the exact charge), I can understand because it's a physical property, put a particle with charge + next to ...
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2answers
791 views
Speed of a particle in quantum mechanics: phase velocity vs. group velocity
Given that one usually defines two different velocities for a wave, these being the phase velocity and the group velocity, I was asking their meaning for the associated particle in quantum mechanics.
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2answers
796 views
Why does Davisson-Germer experiment confirm electron's wave-particle duality?
First I apologize if my question is trivial and for my poor English.
I was wondering why my teacher states that "electron's wave-particle duality is verified if we observe diffraction of the electron ...
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1answer
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Does the speed of sand flow in a hourglass depend on a height of a sand column above the hourglass neck?
In a hourglass, does the sand flow through the neck depend on the amount of sand in the upper glass? If we consider a sand flow analogous to fluid flow, then it should depend linearly, but in that ...
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What is the “shape” of atomic/subatomic particles?
I apologize in advance for my ignorance if this is a question with an obvious answer... I am not experienced in this field. But are such particles in the universe points with a charge, or are they ...
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2answers
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What is a proton-rich atom?
http://wiki.chemprime.chemeddl.org/images/e/e4/Plot_of_Neutron_Number_vs._Proton_Number_.jpg
The above graph shows that all elements have more neutrons than protons in this nucleus. So how is there ...
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Transition of Electric Charge In Collision Between Proton And Antiproton
I know that
$$p+\bar{p}\to 4\pi^++4\pi^-+(\gamma)$$
Before the collision, the sum of absolute electric charge value is $2$.
$$\left | +1 \right |+\left | -1 \right |=2$$
After the collision, the ...
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How Did Paul Dirac Predict The Existence of Antiproton?
The existence of the antiproton with -1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture.
Quotation by Wikipedia.
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How to display particles [closed]
Not exactly physics question but physicist must have encountered this problem before.
In my code I generate a table of six tab separated columns (x,y,z,type,charge,id). I want to create a 3d ...
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1answer
663 views
Confusion between the de Broglie wavelength of a particle and wave packets
So I learned that the de Broglie wavelength of a particle, lambda = h/p, where h is Planck's constant and p is the momentum of the particle. I also learned that a quantum mechanics description of a ...
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6answers
551 views
Good book about elementary particles for high school students?
I need a good book about elementary particles. I am a high school student and don't want anything to technical. I read a brief history of time and the universe in a nutshell but i want something that ...
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Standard Deviation in Particle Physics
I'm familiar with sigma, and how its usually calculated and used, but would like to know how it's applied to particle physics. I recall reading that the discovery of the Higgs would only be credible ...
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1answer
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Phase shifts in scattering theory
I have been studying scattering theory in Sakurai's quantum mechanics. The phase shift in scattering theory has been a major conceptual and computational stumbling block for me.
How (if at all) does ...
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3answers
316 views
Is there Bremsstrahlung radiation for a charged massless particle?
This is a follow up question from: Massless charged particles
Since by definition such a particle would interact with photons- resulting in some change in momentum- would the particle emit ...
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Massless charged particles
Are there any massless (zero invariant mass) particles carrying electric charge?
If not, why not? Do we expect to see any or are they a theoretical impossibility?
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5answers
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What needs to happen for one to ingest radioactive particles and how likely is this?
There are many stories about radioactivity and the relative danger of it in the news lately, but very little actual information. The radioactivity levels around Fukushima Daiichi are high, but seem ...
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3answers
257 views
References on the non-compositeness of the known elementary particles
What paper(s) or theory(s) describe or prove that the elementary particles that we have determined today cannot be made up of smaller more fundamental particles?
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1answer
729 views
Why does lambda decay violate parity?
When a lambda particle decays into proton and a pion, I am told it does not conserve parity. Why?
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How do alpha and beta particles ionise surrounding particles?
I've been wondering about this question for a while. If you have alpha and beta particles released from a radioactive core, how do they ionise surrounding particles?
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942 views
Why can't massless particle exceed speed of light?
Why massless particle can't exceed speed of light?
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4answers
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is the Z boson one entity or are there as many entities as decay pairs, but they are equivalent and lumped together
just wondering if it is a distinction without a difference - it seeming a bit weird that one thing can decay into different things.
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Unusual particle effects at CERN
In 2010 there were press reports that CERN had identified unusual properties in particle behavour in collisions. One link here.
Here is a partial quote:
"In some sense, it's like the particles talk ...
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3answers
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are particles “knots” or “kinks” of excitation in a field?
this is my mental picture for how they travel without a medium, how (like water waves) some can't stay still, why they have wave and particle properties, energy/mass equivalence, conservation, etc. ...
