Nuclear physics is the study of the composition, behavior and interaction of atomic nuclei and their constituent parts.
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2answers
850 views
Strong force, where is the seperation?
In class I got given a diagram like this: (albeit without the Electrostatic force line)
However the teacher told us the nucleons are typically separated when the force is zero. So as the string ...
8
votes
1answer
344 views
Is ultradense deuterium real?
I've found several articles discussing experimental evidence of a deuterium state of densities over $140 \textrm{ kg}/\textrm{cm}^3$:
F. Winterberg. Ultradense Deuterium. arXiv.
Shahriar Badiei, ...
4
votes
1answer
100 views
Why is the Wick contraction in HFB or BCS equal to a single-particle density?
I'm trying to understand how in Hartree-Fock-Bogoliubov
(HFB) or BCS theory we can write a product of creation/annihilation operators as single-particle densities under the guise of "Wick's theorem".
...
2
votes
1answer
774 views
Does the Breit Wigner formula apply to intermediate virtual particles?
Breit Wigner Formula describes the cross section for interactions that proceed dominantly via a intermediate particle (O*) A+B → O* → C + D:
$$σ = \frac{2\Pi}{k^{2}}\frac{Γ_{i}Γ_{f}}{(E-E_{o})^{2} + ...
1
vote
1answer
53 views
$\require{mhchem}$ $\ce{\beta^{+}}$ decay for $\ce{_9^18F}$, computing $\Delta m$
For the decay:
$$\require{mhchem}\ce{_9^18F\to_8^18O +e+ +{v}}$$
To compute $E$, I need $\Delta m$, the provided answer looks like:
$$m_i = 18.000938~u$$
$$m_f = 17.999159~u + 2~(5.49 \times ...
6
votes
0answers
64 views
Does quark color contribute to “spin degeneracy” for QGP calculations?
Like the title say, does quark color matter in counting contributions in a early universe plasma (QGP), as when adding up the total plasma energy density, or is it just spin? The book I have (Pathria) ...
4
votes
0answers
58 views
Can we excite a nucleus by means of very intense low energy gamma-photon irradiation?
The phenomenon of multiphoton ionisation of atoms has been studied, both theoretically and experimentally, for several decades. Intense LASER beam devices are the apparatuses used for the experimental ...
4
votes
0answers
181 views
Is there a sound theoretical argument against inner-shell induced nuclear chain reactions?
There is a claim often made about cold fusion, that it is excluded theoretically. The main theoretical argument is that electronic energies are too low to overcome the Coulomb barrier, since d-d ...
4
votes
0answers
346 views
Long time deviations from exponential decay in radioactivity
Are there any examples of common substances whose decay is not exponential?
We're used to thinking about radioactivity in terms of half-lives. This is a concept that makes sense only for a decay that ...
3
votes
0answers
30 views
What is the difference between the KDEMO and DEMO projects?
I'm writing a paper on the future of fusion technology and I can't seem to find the difference between Europe's DEMO experiment and Korea's KDEMO except for the fact that they are both planned to ...
3
votes
0answers
46 views
What fraction of nuclear excited states are known?
I was reading a paper today claiming observation of a new $2^+$ state in $^{12}\mbox{C}$, which would correspond to a sort of rotationally excited Hoyle state. Looking at NuDat reveals that this ...
3
votes
0answers
279 views
Why is the binding energy per nucleon not zero for hydrogen atom?
The lone proton has not to be worked on against any electrostatic force. So where does the energy come from? What is mass defect for a hydrogen nucleus?
3
votes
0answers
205 views
Nuclear/quantum physics simulation software
Is there any software which is able to simulate D-T interaction for example and get temperature-crosssection curve without referencing to any experimental data?
Do we have quantum-level simulation ...
3
votes
0answers
1k views
Energy Levels of 3D Isotropic Harmonic Oscillator (Nuclear Shell Model)
One simple way of detailing the very basic structure of the nuclear shell model involves placing the nucleons in a 3D isotropic oscillator. It's easy to show that the energy eigenvalues are $E = ...
2
votes
0answers
764 views
Decay of Cobalt-60 isotope
How does the Gamma decay of Cobalt-60 occur?
Motivation: A research team led by D. Habs made contributions to our understanding of the gamma decay of Ca-40 and Zr-90: ...
2
votes
0answers
108 views
What forms are theoretically predicted for orbitals or quarks in hadrons and of hadrons in tritium?
We all know very illustrative spatial representations of predicted electron orbitals in atoms which are essentially spatial plots of the solutions of wave equations.
In all atoms the electrons occupy ...
2
votes
0answers
79 views
How can I determine the feasibility of Pd(d,f) fission chains?
The conclusion of this paper (p. 6) discusses some hypothetical Pd(d,f) yields as a possible explanation for anomalous results that the author observed. Suspending disbelief in the data reported in ...
1
vote
0answers
49 views
Properties of spilled spent nuclear fuel pellets
Can someone please explain to me the physics of a pile of spilled nuclear fuel pellets on the floor of a spent fuel pool? Specifically, what can we expect in terms of heat and radioactivity releases, ...
1
vote
0answers
82 views
Helium Fusion and the Origin of Elements
In the fifth of his Messenger Lectures Feynman mentions the fact that Carbon-12 has an energy level at 7.82 MeV. He then states that this is what enables the fusion of three Helium-4 ions into Carbon ...
1
vote
0answers
92 views
In what environments can a dipolariton form?
In what environments can a dipolariton form? The article in Science in which it is introduced discusses it in the context of an optical cavity in a semiconductor. Can this quasiparticle occur ...
0
votes
0answers
20 views
What is the magnetic quadrupole moment of a nucleus in cylindrical coordinates?
What is the magnetic quadruple moment of a nuclei in cylindrical coordinates?
The quadrupole moment of a nucleus is zero in spherical coordinates but in the cylindrical coordinates it can't be ...
0
votes
0answers
68 views
Beta decay for Ar-38, K-38, Cl-38
I want to prove that $^{38}Ar$ is stable with respect to $\beta$ decay, that $^{38}Cl$ decays by $\beta^-$ and that $^{38}K$ decays by $\beta^+$.
I know from Googling that this is true, and I also ...
0
votes
0answers
47 views
Photons emitted by radioactive source
Can we calculate the number of photons emitted per second by a radioactive source (gamma) ?
we can take 100g of barium-133 as an example
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votes
0answers
316 views
Is there any reproducible tested evidence for Ni-H cold fusion?
The main replications of cold fusion, the ones that are beyond reproach, used Pd/d as the system. But commercial developers have often claim to use Ni-H to achieve similar effects. The claims include ...
0
votes
0answers
101 views
What is causing the CR39 particle tracks in SPAWAR cell?
At between 28 and 30 minutes into this video presentation the SPAWAR group describes an experiment where a CR39 detector is placed outside a codeposition Pd/d cell.
They saw a large number of ...
