All Questions
16
questions
8
votes
2
answers
2k
views
How does a photon "cheat" its way past a neutron?
I learnt here Is a neutron deflected sideways by a laser beam? that a photon beam has no influence on the motion of a free neutron in the first and second approximation. Now I'm interested in what ...
- 10.6k
1
vote
1
answer
401
views
How Chadwick concluded that the particles are neutrons but not photons?
James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium. How he concluded that the radiation was made up of neutrons ...
3
votes
2
answers
183
views
$n+n \rightarrow n+n$ scattering through photon interaction (QED Process)
If I think about the quark level process then, two u quarks can scatter through photon exchange via QED interaction by following tree-level process
.
This is happening because u quark is electrically ...
0
votes
1
answer
64
views
How does a Poyinting vector act on a neutron?
How does a Poyinting vector act on a neutron? As I understood a photon action on a charged particle this action is purely electromagnetic where the electric component shake the particle perpendicular ...
- 1,815
1
vote
1
answer
175
views
Can a neutron act as a wave? Can the wave of light superpose with the wave of neutrons?
Can neutrons act as a wave? and can that wave superpose with wave of a photon? and what are, if any, the required conditions for that phenomenon to happen? Thirdly, if we pass light through completely ...
- 37
0
votes
1
answer
66
views
Why do gamma-rays and neutrons produce different decay times in scintillation pulses from the same compound?
The basis of pulse shape discrimination is that gamma-rays and neutrons have different decay times of their electronic pulses. What makes gamma-rays and neutrons interact with the same compound ...
- 325
4
votes
1
answer
1k
views
Can neutrons and protons have excited states?
Anything with a substructure has excited states. Molecules, atoms, nuclei all can absorb photons which causes them to make a transition to an excited state. Conversely, when they jump from an excited ...
- 11.8k
13
votes
2
answers
2k
views
Will a free neutron radiate if it is decelerated?
In this answer it is said (and I fully agree):
Yes, a ... photon can accelerate a lone neutron. The kinetic energy imparted to the neutron reduces the photon's wavelength (redshifts it) by the same ...
- 10.6k
0
votes
2
answers
279
views
Can a photon transmit a momentum to a neutron? [duplicate]
Is a photon able to transfer an impulse to a neutron or, and this is the same, can light accelerate a neutron?
- 10.6k
0
votes
1
answer
60
views
Why does a scintillator need to be fast decaying?
I have two scintillators, say, one with a decay time of 1 ns vs. one with 100 ns. All other parameters like light yield, size of crystal, electronics used, source emission rate, are the same for both. ...
- 325
1
vote
1
answer
428
views
Scintillator decay time=1000 nsec,does that mean dead time is really high?
What I'm really confused about is, say my scintillator is really slow, and has a decay time of about 1000 nsec. Does that mean, if one neutron is being read by the electronics, for that particular ...
- 325
2
votes
0
answers
45
views
How do you calibrate a proton-recoil scintillation fast neutron detector?
I have a proton recoil scintillator, but gamma sources like Cs-137, Co-60 don't seem to have linear calibration for the device. Are there other ways of calibrating this device? I'm trying to detect ...
- 325
2
votes
1
answer
72
views
Photomultiplier pulses only at first few channels?
I have an old Hamamatsu PMT, and I have a scintillator that can detect neutrons, gammas, alphas. But no matter what source I use, I'm only seeing counts at the first few channels (up to about the 15th ...
- 325
2
votes
1
answer
400
views
Photomultiplier/ voltage divider troubleshooting
I have a Photonis XP5301 PMT to use for fast neutron detection (detector optically glued to the PMT window). I can't quite figure out why its not producing a spectrum. First of all, I have multiple ...
- 325
2
votes
3
answers
362
views
Can photons be created without an electric charge involved?
It seems that in common ways how to produce light (electromagnetic waves, photons) must be involved particles with electric charge: accelerating electrons, spontaneous or stimulated emission, gamma ...
- 2,163