All Questions
Tagged with nuclear-isomers nuclear-physics
10 questions
1
vote
1
answer
69
views
Nontrivial color current moments in the nucleus
Is not clear that all color-related moments of nuclei would vanish. A previous answer on the subject suggests some of them are not forbidden by symmetries.
Additionally, some nuclear experiments ...
- 361
0
votes
1
answer
56
views
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 ...
- 35
2
votes
2
answers
58
views
How do nuclear physicists know if a particularly long-lived nuclear isomer actually exists? If it never seems to emit a gamma ray?
Some nuclear isomers (like tantalum-180m) have never even been observed to decay....
How do we know it is in an excited state then? That it actually absorbed some form of energy?
Can these includes ...
- 4,709
0
votes
2
answers
124
views
Why can't high-level nuclear waste be disposed of by bombarding troublesome isotopes with neutrons, protons and gamma rays (photodisintegration)?
Why can't isotopes with long half-lives be radiated with free protons, neutron radiation and gamma rays (photodisintegration) in order to transmutate those isotopes into something either stable (or ...
- 4,709
1
vote
1
answer
108
views
Why does the doubly-magic nucleus tin-$132$ have such a short mean lifetime?
Why does the doubly-magic nucleus tin-$132$ have such a short mean lifetime? Only because it is far from valley of stability?
- 13
1
vote
0
answers
101
views
Is it possible for there to exist metastable exotic atoms?
I've been quite fascinated with the invention and discovery of exotic atoms such as: positronium, and muonic hydrogen etc...
Now I know positronium has a longer than usual lifetime because it is in a ...
- 3,019
4
votes
2
answers
152
views
By how much are various dibaryon states unbound?
It has been known for a long time that the deuteron is stable but the dineutron (nn) and diproton (pp) are not. Many textbooks comment on this, but all the ones I found so far do not give quantitative ...
- 61.8k
11
votes
1
answer
501
views
Have we found all stable nuclear isomers?
Nuclear isomers are metastable nuclear states, typically protected from decay by having very different angular momentum from the ground state. Some are very stable; my favorite $^{180m}$Ta has a half-...
- 33.4k
0
votes
0
answers
189
views
Nucleosynthesis of tantalum-isomer $^{180{\rm m1}}{\rm Ta}$
How does nucleosynthesis explain the creation of tantalum-isomer $^{180{\rm m1}}{\rm Ta}$?
Or what is the best theory to explain the existence of this?
It must be noted that the tantalum-isotope $^{...
- 2,499
4
votes
1
answer
217
views
Creation of nuclear isomers
As I understand it, if a nucleus is excited with energy exceeding its ground state, it releases energy via gamma radiation. An example would be technitium 99m, a medical tracer with a 6 hour half life ...
- 5,812