Questions tagged [nuclear]
For questions relating to the dynamics and processes that occur within and interactions between the nuclei of atoms.
68
questions
3
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29 views
What is the power density of graphite user the Wigner effect?
The energy that graphite released upon a cascade of defects by neutron radiation is 2.7 MJ/Kg, however there is no data on how quick this energy is released. I am interested in this as this not ...
4
votes
1answer
38 views
Does the amplitude of the RF pulse affect the NMR signal?
I know that the NMR signal depends on the static magnetic field strength $ B_0 $ (by Boltzmann equation) and its gyromagnetic factor. While NMR occurs when the RF pulse frequency matches the equation:
...
1
vote
1answer
74 views
Can the enrichment of Uranium be done via manipulating the boiling/melting point difference between differing isotopes of the same element?
I have a Physics question for which I could not find the answer on the Internet, so I would like to see if y'all know the answer to it.
I have found that heavy water will have a different boiling ...
-4
votes
1answer
51 views
If there is no destruction of mass in the nuclear fission , then how is tremendous energy is released? [closed]
In the fission of U-235 , calculate the mass of reactants , which are U-235 and 1 low energy neutrons .
hence , the mass in reactant is = 235 + 1 = 236amu (atomic mass unit).
Now , in the products , ...
0
votes
1answer
50 views
electron - nuclei recombination within stars
Nuclear fusion within stars combine atom nuclei, so the atoms are ionized and electrons run for free.
My question is, when or how these electrons recombine with the nuclei to form neutral atoms? ...
1
vote
0answers
46 views
What happens to chemical bonds if the nucleus changes? [duplicate]
Lets say I have some $\ce{PuF6}$ (with the Plutonium being $\ce{^{240}Pu}$). I take this $\ce{PuF6}$ and bombard it with neutrons. The $\ce{^{240}Pu}$ nuclei capture the neutrons, forming $\ce{^{241}...
3
votes
0answers
79 views
Why isn't protium nucleus considered most stable nucleus?
My chemistry teacher told me that $\ce{^{56}Fe}$ is the most stable nucleus because of the highest binding energy per nucleon.
But if we consider a protium nucleus, it has only 1 proton so there is no ...
-2
votes
2answers
152 views
If D₂O (Deuterium Oxide) in large quantities, is exposed to explosive amounts of Neutrons or Protons, can it possibly go Nuclear? [closed]
If you exposed large amounts of Protons or Neutrons to Deuterium Oxide, could it possibly explode or implode.
Im basing this off a Chemical Simulation, in which simulated Protons are exposed to ...
0
votes
3answers
262 views
Why does radioactive matter decay in series of half-lives?
I was studying types of nuclear decay, and I came across the concept of "half-life". And I started wondering why does nuclear matter decay in half-lives? In other words, why does the rate of nuclear ...
-1
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1answer
51 views
Nuclear physics [closed]
When considering Fusion, the matter that gets converted into energy what specific matter is converted exactly like a quark and is most of the energy created from the matter turning into energy?
0
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1answer
114 views
Size of atomic shells
Is the distance of some $n^{th}$ shell ($n$ $\neq$ outermost shell) from the nucleus of an atom different for different elements?
If so, then how much is the difference or how could we calculate it?
0
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1answer
110 views
Can neutrons be ejected from an atom?
In a neutral atom, can neutrons be ejected, and if so, by what (nuclear) process or reaction? I have read Neutron emission and Can a proton be ejected from an atom, but I don't understand how and if ...
1
vote
3answers
747 views
Intuition for why effective nuclear charge increases down a column
My textbook (Chemistry the Central Science, edition 12, Brown et al.) says that effective nuclear charge increases down a column. Indeed, this is consistent with the values provided by Clementi in the ...
1
vote
0answers
49 views
What is the most stable pear-shaped nucleus? [closed]
I have heard on the Internet that there are at least three pear-shaped nuclei: radium-224, radon-220 (a direct product of the previous isotope), and barium-144. CERN has a webpage about this discovery ...
14
votes
0answers
187 views
What happens when para-water ice is suddenly melted?
Background (hydrogen)
In the case of recently liquified hydrogen (which is quite cold of course) it must be re-equilibrated before loading on to a rocket as fuel to avoid a sudden exothermic ...
0
votes
1answer
52 views
If a sample to be carbon-dated is wrapped in a piece of paper, will you still be able to effectively measure the radioactivity of the sample? [closed]
If a sample to be carbon-dated is wrapped in a piece of paper, will you still be able to effectively measure the radioactivity of the sample?
0
votes
2answers
113 views
How much ionising radiation is released during an atomic blast?
I've been looking for how much ionising radiation is produced during an atomic blast (as a percentage).
I have seen a claim of 5% of the energy in an atomic blast is ionising energy (Wikipedia), but ...
1
vote
2answers
101 views
Anti matter elements? [closed]
Quite a self-explanatory question I guess. I wonder whether there is any information or theory on this. I seem to like remember there is such an element with positron in center and electron rotating ...
-2
votes
1answer
28 views
Unstable or radioactive as a property?
What is better term for describing a chemical element; "radioactive" or "unstable"?
I am leaning towards the "unstable", because it seems to me that it better describes nature of the element, as ...
3
votes
1answer
388 views
Uses of ruthenium-106?
I read a news article recently about a cloud of ruthenium-106 being released over Europe. The article mentioned one of the uses for this specific isotope is in fuel cells for satellites. I tried to do ...
5
votes
1answer
637 views
Why do Alpha particles not collide with electrons during alpha decay? [duplicate]
Alpha particles are positively charged, so my question is that during alpha decay, when these are released from the nucleus, why doesn't it ever occur that they collide and grab an electron or two ...
0
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3answers
1k views
Can you decay to half an atom?
In school we are learning about half-life, and I was wondering if it is possible to decay to half an atom?
-2
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2answers
941 views
Why atomic number decreases in alpha emission
My teachers taugh me that alpha particle is a helium nucleus carrying net +2 charge, hence if an radioactive subastance emits alpha particle it looses two of its protons and two neutrons but no ...
7
votes
1answer
397 views
Molecular Hamiltonian of Helium hydride ion
Currently, I am going through Quantum Simulation of Helium Hydride Cation in a Solid-State Spin Register. I am not a chemist but rather a computer scientist hence having trouble following the paper.
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4
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0answers
1k views
Is order of reaction defined for nuclear reactions?
I am asking this question after asking a similar one for spontaneous nuclear decay phy.stack. Link
Order of reaction is defined for chemical reaction. But wikipedia says about spontaneous nuclear ...
4
votes
1answer
225 views
Rutherford's gold foil experiment [duplicate]
Rutherford projected $\alpha$-rays onto the gold foil. $\alpha$-rays are the same as a $\ce{He^2+}$ nucleus and they can ionize atoms. Therefore, why are gold atoms not ionized when the $\alpha$-rays ...
4
votes
1answer
345 views
When do reactions reach steady state?
I was doing a multiple choice problem that asked about when the following nuclear decay sequence reaches steady state (When does the activity of $\ce{^99Mo}$ roughly equal the activity of $\ce{^{99m}...
4
votes
1answer
303 views
How does radiocarbon dating work?
I'd like to better understand radiocarbon dating, however, I do not know what resources I must use in this regard. Could someone walk me through the process of radiocarbon dating with a few examples? (...
5
votes
0answers
358 views
How to estimate the enrichment of U-234 from the enrichment of U-235?
Fresh nuclear fuel made from naturally occurring uranium (i.e. neither MOX nor ERU fuel) is mainly characterised by the enrichment of $\ce{^235U}$. The mass and activity concentrations of $\ce{^235U}$ ...
0
votes
1answer
86 views
On what basis can we say that one nuclide is more stable than another one? [closed]
I read in a textbook that the nuclide $^{40}_{20}\ce{Ca}$ is more stable as compared to $^{30}_{13}\ce{Al}$. I checked it online and saw that most sources describe the observation with respect to odd ...
0
votes
1answer
79 views
Low Energy Nuclear Reactions [closed]
I was interested in knowing if Low Energy Nuclear Reactions are practical or just mythical. What is the current stance of the scientific society about their feasibility?
0
votes
1answer
102 views
C14 Nuclear Diamond to AA Battery Apples-to-Apples Engery output
I was reading an article about nuclear diamonds and they made an apples-to-oranges comparison of a 1 gram C14 nuclear diamond to a single AA battery. Here is the part I'm referencing:
"An alkaline ...
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1answer
1k views
Why are neutrino/anti-neutrino released in Beta decay? [closed]
In positive beta decay neutrino are released whereas in negative beta decay anti neutrino are released. From where did they came? Are they produced during the collision? What s it's purpose? Is it to ...
-2
votes
1answer
486 views
Why during nuclear fusion does the process only release neutrons? [closed]
Say we envision subatomic particles like balloons held together by static electricity (analogous to nuclear force).
Now we smash em' together. They make a new element. My chemistry test answer key ...
-2
votes
1answer
112 views
Cold fusion via chemical reactions?
How could a nuclear reaction possibly happen at room temperature? We know how other blasts work and what chemicals are used to cause their effect, but what chemicals could cause a nuclear reaction at ...
0
votes
2answers
759 views
Rutherford gold foil experiment
This question may sound silly.
What actually I understood from this experiment is that the positively charged nucleus which is in the center is responsible for the bending and reflection of the alpha ...
3
votes
1answer
186 views
Nuclear Fallout [closed]
If there was a nuclear explosion and years later I come out of a fallout shelter like in the popular game series Fallout, what elements would react to the radiation in a way that could harm humans and ...
5
votes
1answer
1k views
Are photons ejected from atomic nuclei?
I have heard that electrons absorb or eject photons when transitioning from one orbital to another. Is this correct? Can atomic nuclei eject photons?
6
votes
2answers
2k views
What chemical elements does a nuclear explosion release into its mushroom cloud?
I'm interested in the mushroom cloud produced by a nuclear explosion: What is it made of?
I know that the uranium fission reaction is the following (from this web page)
$$\ce{{}^{235}U + {}^1_0n -&...
0
votes
1answer
2k views
Can we make Gold in a Lab? [duplicate]
Can we make Gold in a Lab? Is it possible to make changes in metals that will create Gold? and How?
I have tried to search something related to this but didn't get any good results.
Thanks in Advance
2
votes
1answer
564 views
Why doesn't the atomic number change by two in the process of production of Americium?
Looking at the bomardment of uranium-238 this is what I see.
First, I see a uranium-238 atom with 92 protons bombarded with a neutron. The neutron then undergoes beta decay into a proton. So we then ...
5
votes
3answers
2k views
How are nuclei stable?
We all know that the density of the nucleus is very high.
Nuclei are made up of protons and neutrons, and while protons have the same charge, they are closely packed in a nucleus. How does the ...
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votes
3answers
242 views
Beta Decay - Doesn't Add Up [duplicate]
The definition of beta $(\beta^-)$ decay is that an electron is produced.
For example,
$$\ce{^131_53I -> ^131_54Xe + e^-}$$
So iodine forms Xe and releases one electron with a -1 charge only and ...
2
votes
2answers
3k views
Nuclear power: what material is the control rod made from?
What type of material is used in the control rod of a nuclear reactor? (Nuclear power plant)
2
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4answers
7k views
What is the difference between nuclear fission and nuclear fusion?
I always mix up the definition of nuclear fission and nuclear fusion. So, what is nuclear fission and nuclear fusion, and an example for each?
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1answer
487 views
Do elements actually transmute in nuclear reactions?
Whenever a nuclear transmutation happens, do we get a new element or do we have the same element with chemical properties of a different element?
Isn't it very much against the intuition?
0
votes
1answer
91 views
"Orthogonality" of chemical elements
Chemical elements are said to be immutable at normal energies, but not at the energies that are orders of magnitude higher.
Given that nucleus at normal energies gives us the Periodic Table and at ...
5
votes
1answer
670 views
How to derive the nuclear spin of 23Na?
Is it possible to derive the nuclear spin I=3/2 for $\ce{^23Na}$ from a term scheme or from something else from spectroscopy?
I thought the nucleus spin is empirical (and cannot be calculated from J ...
1
vote
3answers
141 views
Radioactivity and Kinetics of disintegration
Well I've just started on kinetics and there are a few things I am absolutely confused about!
First of all, is a neutron actually made up of a proton and electron? If yes, then how is this possible?
...
0
votes
1answer
73 views
How long must a sample be irradiated before all 59-Co atoms are converted to 60-Co? [closed]
For the interaction, n$^0$ + $^{59}$Co $\to$ $^{60}$Co
