RealQM offers a model of an atomic nucleus as being composed of protons and electrons just like an atom but with shifted roles. An atom consists of a collection of electrons with negative charge surrounding an atomic nucleus including protons with positive charge. Similarly RealQM suggests to view an atomic nucleus to consist of a collection of protons surrounding a kernel including electrons compressed into a negative charge density. See this article.
In the atom model of RealQM electrons appear as negative non-overlapping charge densities with a spatial extension measured as kinetic energy. Likewise, in the nucleus model of RealQM protons appear as positive non-overlapping charge densities with spatial extension measured by kinetically energy. An atom has a size of about $10^{-10}$ m, while the size of a nucleus may be about $10^{-16}$ m. The change of scale of about $10^6$ translates to a change of scale of total energy with the same factor, thus roughly from eV for atoms to MeV for nuclei.
RealQM thus offers a unified model of an atom including its nucleus, where electrons appear with vastly different spatial extension of size $10^{-10}$ outside a nucleus for an atom, and of size smaller than $10^{-16}$ inside a nucleus.
The basic RealQM model of a nucleus of positive charge $+Z$ consists of $2Z$ protons surrounding a kernel of negative density of total charge $-Z$. A neutral atom can then be built around such a nucleus by adding Z electrons. This atom model thus consists of altogether $2Z$ protons and $2Z$ electrons and there is no need for neutrons.
We then have to ask from where neutrons can come, if they are not hiding inside atomic nuclei. Well, neutrons were experimentally detected by Chadwick in 1932 when bombarding beryllium with 4He (alpha-particle) as a neutral penetrating radiation able to knock out protons, which could not be explained as gamma-rays (electrons). Chadwick declared that he had detected a particle of no charge with a mass about that of a proton, a neutron which gave him the Nobel Prize in Physics in 1935.
Once the neutron was detected it was shown that it could decay into a proton + electron (+neutrino) with release of energy of about $0.78$ MeV which opened to a possible reverse process of forming a neutron from a proton + electron under input of energy. This showed to appear in the chain reaction of nuclear fission where a nucleus is divided into pieces under ejection of neutrons sustaining the reaction.
RealQM computes the total energy of a nucleus and shows that for $Z<26$ fusion of two nuclei into one nucleus is energetically favourable. This is in particular the fusion process in the Sun with two $Z=1$ nuclei combing into one $Z=2$ nucleus, thus with two 2p+e transforming into one 4p+2e or two 2H as deuterium transforming into one 4He, thus without invoking any neutron. The process may take several intermediate steps as displayed in this picture, showing in particular that neutrons (if present at all) have no role to sustain the fusion process:
All this is wildly speculative, but there is a bit of logic which may open to physical realisation.
If RealQM can model not only atoms and molecules but also atomic nuclei, a unified field theory may be possible.
Recall that the Standard Model is very complex and in particular involves force carrying particles so called leptons, which have no role to play in RealQM
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