All Questions
Tagged with neutrons radioactivity
21
questions
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24
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Neutron diffusion equation cylinder question
Hi there I was wondering if anyone could help me with how to approach this problem that I have. I'm looking to find the neutron flux outside of a cylindrical container which is made of steel, however ...
- 15
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votes
1
answer
38
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Neutron Dose Rate to Activity Calculation
This is a completely hypothetical question but say I have an unknown radioactive source inside a steel box, given the dimensions of the volumetric source and the container, the neutron dose rate 1m ...
- 15
1
vote
1
answer
257
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Difference between $e^-$ capture and $ β^+ $ decay
A nucleus stability is judged by it's n/p ratio, which it prefers to be ~1. If n/p ratio is much less than 1, an atom tries to increase neutrons and decrease protons present in the nucleus. My physics ...
- 11
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1
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44
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What if there are three less neutrons in $_{89}^{238}U$? [closed]
I am wondering what will happen if there are three less neutrons in $_{89}^{238}U$? I found this problem in a book. Will it produce $_{89}^{235}U$ or $_{92}^{235}U$?
The reason for choosing $_{92}^{...
- 1,070
3
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1
answer
749
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Why free neutrons are usually produced in a Nuclear Fission?
The production of neutrons is a feature of fission reaction. Usually 2-3 free neutrons are produced in the fission. Why is that so?
- 1,481
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51
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Can we uniquely determine the particles emitted in a neutron induced binary fission of a radioactive element?
Can we uniquely determine the particles emitted in a neutron induced binary fission of a radioactive element?
For example, if we have $
\newcommand{\U}{\mathrm U}
\newcommand{\Mo}{\mathrm{Mo}}
\...
- 362
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1
answer
364
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Decay of proton to neutron [closed]
Decay of proton to neutron is--
Possible only inside nucleus
2)Not possible
Always possible as it is associated with Beta+ decay
I thought that mass should
be conserved here, but we know that ...
1
vote
1
answer
439
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What is the precise value of the lifetime of a neutron?
Free neutrons are unstable. It decays to proton, electron and an antineutrino via beta decay. Can we not do a quantum field theory calculation to predict the precise the decay width? Its inverse ...
- 11.8k
1
vote
1
answer
18
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Pressure stabilisation of radionuclei
Looking at explanations of neutron stars, the neutrons towards the center of the star are stabilised by the enormous pressure, and so don't undergo nuclear decay. I am wondering if this is possible ...
- 131
5
votes
3
answers
993
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When are W-bosons emitted?
According to this Wikipedia page W-bosons are involved in beta decay. According to Wikipedia, this occurs when a down quark turns into an up quark and also emits a W− boson. When this happens in a ...
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4
votes
1
answer
214
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Polonium 210 degradation
From what I read online - Polonium 210 is the isotope used as the neutron initiator in nuclear weapons. But the half-life of this element 138 days.
This raises questions:
how do substantial ...
- 411
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2
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504
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Limit to number of neutrons in nucleus [duplicate]
As far as I understand the number of protons in a nucleus is limited because Coulomb forces grow faster with the number of protons than the nuclear force. So alpha/cluster decay limits the size in ...
- 4,292
2
votes
2
answers
577
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Unstable vs. stable nuclei plotted on a graph
The enclosed graph shows the number of Protons on the x-axis (Z), and the number of Neutrons on the y-axis for all elements (N). Stable combinations are marked by black squares, whereas unstable ones ...
- 559
2
votes
1
answer
188
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Which elements or isotopes can be analyzed by Neutron activation analysis (NAA)?
Some sources name only a handful, but that might refer to the use of optical film. Others state more than 70. I would like to know which elemets or isotopes can be detectet/imaged by NAA.
- 191
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2
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249
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Creating isotopes by shooting neutrons into an unstable nucleus [closed]
I've been doing a lot of amateur research lately (youtube videos) on particle physics and find it all really interesting. I'm also a crazy alien conspiracy theorist who believes in the whole "Bob ...
- 31