Linked Questions

12
votes
2answers
5k views

Why are the dineutron and diproton unbound?

It is known that there is no diproton and dineutron nuclei. Does this mean that two protons or neutrons are not actually attracted to each other? Even if the attraction was weak, wouldn't it cause ...
5
votes
2answers
263 views

How (if at all) can the neutron-proton ratio of stable atoms be explained under the nuclear shell model? [duplicate]

To begin where I did with this question, I was originally wondering about why the neutron-proton ratio is close to 1 for stable nuclei. The answer to my original question (as far as I understand it) ...
5
votes
2answers
1k views

Stable Nuclei - Deviation from equal protons and neutrons

While studying the semi-empirical mass formula for nuclei, I came across an "asymmetry term" whose function, as far as I understand, is to build in the fact that nuclei "prefer" to have equal numbers ...
3
votes
2answers
1k views

Why is a nuclei with too many neutrons unstable? [duplicate]

I understand that a nuclei with too many protons is unstable as the electromagnetic repulsion becomes too strong to be balanced by the strong nuclear force. However in the case of there being too ...
0
votes
2answers
79 views

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 ...
3
votes
1answer
60 views

Why are lighter nuclei dominated by $\beta$-decay and heavier ones by $\alpha$-decay?

While I'm trying to understand the nature of radioactive decay, I found that the lighter nuclei mostly have $\beta$-decay while heavier nuclei have $\alpha$-decay. From what I know is that the $\...
2
votes
1answer
87 views

Stability in Nuclear Shell Model

As far as I understand , a particular sub-shell is filled with either protons or neutrons, $2*(2l+1)$ number of them, and never both together since protons and neutrons fill up levels separately in ...
1
vote
1answer
38 views

Quantised energy levels of the nucleus

We know that the atomic energy levels are quantised since the nucleus has a potential of its own and solving the Schrödinger equation we can see that. But in gamma emission we see that the origin of ...
0
votes
1answer
189 views

Strong nuclear force vs electrostatic repulsion between protons

Does the strong nuclear force balance the electrostatic repulsions between the protons or does it overcome the repulsion? I looked up on wikipedia and it says that the strong nuclear force is ...
0
votes
0answers
23 views

Asymmetry in p-p, n-n and n-p interactions

Why does the asymmetry exist between the proton-proton, neutron-neutron and neutron-proton strong interactions in the nucleus (which results in nuclei preferring equal numbers of neutrons and protons)?...
0
votes
0answers
34 views

Radioactivity of elements [duplicate]

I know that when number of protons is high, the nucleus of atoms become unstable due to repulsive force and is radioactive. But why is that the nucleus also becomes unstable when there are too many ...