All Questions
Tagged with electromagnetic-radiation nuclear-physics
42
questions
8
votes
4
answers
2k
views
How can photons interact with nuclei?
How can photons such as X-rays or gamma rays interact with the nuclei of atoms given that, as I understand it, the length scale of a nucleus is around a couple of femtometers? So, shouldn’t the size ...
- 133
2
votes
0
answers
62
views
The $\alpha$ particle's energy inside a nucleus is lesser than the Coulomb barrier height. Justify
The $\alpha$-decay is usually explained via quantum tunnelling. This is because the $\alpha$ particles do not have sufficient energy to climb over the Coulomb barrier. But how do we know this?
We can ...
- 11.7k
0
votes
1
answer
49
views
Thomson Scattering when low intensity light meets an orbital electron
Can you explain to me the reason why Thomson Scattering can not explain what happens when light meets an electron at low intensity, and what does that have to do with light being a wave or particle or ...
- 151
0
votes
0
answers
26
views
How does a photon interact with EM field of a nucleus thus exchange momentum and recoil the nucleus when pair production happens? [duplicate]
The photon must be near a nucleus in order to satisfy conservation of momentum, as an electron–positron pair produced in free space cannot satisfy conservation of both energy and momentum.[4] Because ...
- 151
0
votes
2
answers
156
views
Why take into account deceleration radiation only, but not acceleration radiation when Bremsstrahlung happens?
Why only take into account deceleration radiation rather than the radiation caused by acceleration when going tangent towards the nucleus and acceleration caused by the change in direction when flyby ...
- 151
0
votes
1
answer
133
views
Why isn't there Bremsstrahlung Radiation for Energy less than 20 keV for Tungsten?
https://www.researchgate.net/figure/Bremsstrahlung-and-characteristic-radiation-spectra-are-shown-for-a-tungsten-anode-with_fig4_8365056
Fast electrons produce X-rays in the anode of an X-ray tube ...
- 151
4
votes
1
answer
88
views
How does inner Bremsstrahlung work?
I'm trying to understand inner Bremsstrahlung. I know this applies to beta minus decay, but have a hard time understanding how it works. In the beta decay, electron is emitted from nucleus. I believe ...
- 200
1
vote
0
answers
32
views
Could somebody explain alpha channeling in tokamaks?
Could somebody explain alpha channeling in Tokamaks and mirror machines? Energetic alpha particles (in the center of the torus or mirror device) born in fusion reactions, interact with a wave and ...
- 345
0
votes
0
answers
53
views
How many alpha and gamma rays are given off from nuclear waste uranium 235
From the products of uranium 235 waste how much total energy / beta, alpha, gamma rays would be emitted from the decay of uranium 235 over its time of decay.
- 1
0
votes
2
answers
73
views
What may cause voltage between 2 distant probes of multimeter in apartment room?
In an empty apartment room,my multimeter shows 3.6 mV voltage when I put 2 probes with 2 meters distance.
I am curious,what may cause voltage between 2 distant probes of multimeter in apartment room?
...
- 127
1
vote
1
answer
75
views
Can fusional nuclear compression theoretically be achieved with a unidirectional compressive force?
In other words, is it theoretically possible to get an energy-profittable nuclear fusion reaction by simply slamming compressive force into some nuclei from a single laser compressing from one ...
- 29
1
vote
1
answer
90
views
What is passive gamma ray emission?
I was trying to find the meaning of passive gamma-ray emission through the internet. I haven't found any helpful article except some research paper just denoting the word passive ray emission. They ...
-2
votes
2
answers
161
views
Why don't spinning protons stop?
The Bohr model in which electrons orbit a nucleus can be shot down quickly on the grounds that the electron would have to be accelerating in order to stay in an orbit, an accelerating charge radiates ...
- 217
3
votes
0
answers
31
views
How nucleons get excited? [duplicate]
Gamma rays can be released when nucleons at higher energy states fall down to lower energy states, but how do nucleons get that much high energy to release gamma rays?
- 31
4
votes
0
answers
49
views
What is the lowermost energy a photon can be emitted by hyperfine transitions?
The 21 centimeter Hydrogen line comes from the hyperfine transition from its one electron, which leads to a photon with the energy of $2.24\times10^{-25}$ joules being emitted.
Can lower energy levels ...
- 441
42
votes
7
answers
5k
views
Do nuclei emit photons?
Generally in text books they say that when a electron goes from high energy state to a lower energy state it emits photons.
My question is, it is possible that a proton that goes from high energy ...
- 445
0
votes
1
answer
34
views
Exposure rate equation variables
I recently saw this equation for the exposure rate in the absence of shielding but couldn't quite find what "A" means in this context. Would anyone happen to know what the "A" variable is? Thanks.
- 23
1
vote
3
answers
118
views
Why would gamma spectroscopy be a tool for nuclei?
I am very much familiar with Atomic spectroscopy, not much with nuclear spectroscopy.
In atoms (electronic cloud), we have electromagnetic interaction that plays the leading role, whose exchange ...
- 427
39
votes
4
answers
7k
views
Why exactly do atomic bombs explode?
In atomic bombs, nuclear reactions provide the energy of the explosion. In every reaction, a thermal neutron reaches a plutonium or a uranium nucleus, a fission reaction takes place, and two or three ...
- 810
1
vote
1
answer
79
views
Why $\rm He^{++}$ is more opaque than $\rm He^{+}$ and so absorbs more energy?
In the Cepheids, $\rm He^{++}$ is more opaque than $\rm He^{+}$ so it absorbs more energy.
If it is because a more charged particle have a higher electromagnetic field and the stronger the field, the ...
- 59
0
votes
1
answer
256
views
How do nuclear transitions generate electromagnetic waves?
In my last question, Can stimulated emission happen in nuclear energy states?, anna v mentioned this in his/her answer:
This involves nuclear transitions, but the output is electromagnetic.
I ...
- 3,187
7
votes
2
answers
1k
views
Why is radiometric dating only considered a use of alpha and beta radiation?
I was told that a use of both alpha and beta decay is in radiometric dating.
Why is radiometric dating not also considered to be a use of gamma radiation?
- 1,276
3
votes
1
answer
406
views
How does mass-energy equivalence work differently in nuclear decay where there is nucleus excitation?
I feel that I have a misconception somewhere in my understanding of quantum physics and nuclear decay.
In fission, when the products have less mass in total than the reactant, the excess is ...
- 31
3
votes
2
answers
475
views
Measuring nuclear magnetic resonance
We are in process of designing an NMR experiment for our physics lab. The equipment has been set and we obtained resonance frequency for some samples. The setup is a bit rudimentary with a very small ...
- 349
0
votes
1
answer
213
views
why is cross section of pair production in field of electron smaller than that in the field of nucleus?
Pair production cannot take place in a vaccum since momentum conservation would be violated. However it can take place in the field of a nucleus or an atomic electron. Why, though, is the cross ...
- 119
1
vote
1
answer
171
views
Can We "Tune" The Radiation Output Of a Nuclear Device.?
After reading "Project Orion", the 1950's plan to launch a large mass spaceship using small nuclear devices, (and also from common sense), I realise that a lot of nuclear research is classified.
The ...
user108787
0
votes
2
answers
175
views
Gamma spectroscopy - Nuclide identification
I have a question about what the usual practice is for nuclide identification in gamma spectroscopy.
For example, if I see a line at 477 keV, I would write that the origin of this line is $^7Be$. As ...
- 1,756
1
vote
0
answers
65
views
To which extent is the treatment of nuclear multipole radiation by the means of a classical electromagnetic field valid?
In the treatment of nuclear multipole radiation, for example in the context of nuclear gamma decay, it is standard, at least at the elementary level, to formalize the electromagnetic radiation as a ...
- 3,623
0
votes
0
answers
113
views
How does mass affect the range of a nuclear particle?
Heavy particles such as protons and alpha particles of certain energy will lose all their energies in a definite distance in a medium, and this distance is called the range. The range is the distance ...
- 1,793
0
votes
2
answers
452
views
Gamma spectroscopy - Do annihilation photons produce a backscatter peak?
Below is a diagram of part of a structure which I find in a gamma spectrum taken from a hall in which a neutron source is undergoing spallation.
The structure which I'm interested in can be seen ...
- 1,756