2019年6月23日 · The extra energy of less stable nuclei with higher than optimal proton/neutron ratio for a given nucleon number is released by conversion of a proton to a neutron, emitting positron and electron neutrino. The other possible beta decay mode of proton rich nuclei is an electron capture. Some interesting details about relative nucleus stability

Of course the reaction is going to be opposite to regular proton decay because of charge but it is going to be similar. It proves that antiprotons are more unstable than protons. However if this was the case even if protons did not decay, any antiprotons would have decayed in the LHC.(probably long before the annihilation with regular old protons.)

I know that the half life of a proton is more than $6.6\\cdot 10^{33}$ years (antimuon decay). I have found this data on Wikipedia proton decay but I do not know the probability distribution that le...

2021年4月8日 · Decay of proton to neutron is--Possible only inside nucleus; 2)Not possible. Always possible as it is associated with Beta+ decay; I thought that mass should be conserved here, but we know that neutron mass is more than proton,so how in any emission can proton decay into a neutron? [The correct answer given here is 2,i.e(possible only inside ...

2024年8月20日 · Proton decay is a theoretical possibility, as it is predicted to happen by some GUTs, so the proton may not be stable and could decay into lighter particles considering enormous time scales. If proton ...

2015年12月6日 · Protons have smaller masses than neutrons. It is energetically favorable for a free neutron to decay into a (proton, electron, anti-neutrino) but not possible for a free proton to decay into a (neutron, positron, neutrino). Inside a nucleus, however, the latter process is possible (positive beta decay).

2021年2月1日 · But does the lack of evidence for proton decay really rules out the basic grand unification theories? The GUT's prediction of proton half-life is based on the assumption that the primary channel of proton decay in GUTs is usually "proton to electron/positron and meson", which is actually predicated on the assumption of $(e, \nu_e, u, d)$ being ...

2016年9月25日 · The most vexing problem is the apparently insurmountable issue of Proton Decay and how this could put a premature halt to our species and in fact any complex baryonic structures. I know that Proton Decay has not been observed in practice, but the timescales involved for the effects to become appreciable have not and will not for a great long ...

The pure decay is $$ p \to n + e^+ + \nu_e \,,$$ and requires a little more energy that you would naively expect from the masses of the proton, neutron and positron (and, of course, can only proceed in a context where there is energy to be had doing it, such as in some heavy nuclei).

2018年5月13日 · $\begingroup$ The question you should be asking is more subtle than that. In most cases a beyond-the-standard-model theory is attractive because it solves several problems at once, and constraints on the theory could make it unappealing not because it prove that the theory can't be so but because it turns some knob until one or more of those explanations is …