i mean in the beta minus decay neutrons turn to protons and that protons stay in the nuclues..but is there any case where that protons,electrons and electron antineutrinos are emitted...i think free neutrons decay in this way...
Proton emission is possible for highly unstable and artificially produced nuclides (as the Wikipedia article indicates), otherwise proton-rich nuclei decay by positron emission or electron capture.
In beta decay, the resulting proton stays within the nucleus, and with positron emission or electron capture, the resulting neutron stays within the nucleus since the proton or neutron does not overcome the binding energy threshold.
One can have neutron emission if gamma photons with energy exceeding a certain threshold value (binding energy of a neutron for the given nucleus) is incident upon the nucleus. That is photoneutron emission, or in the case of a deuteron, photodisintegration.
It is a difference between the proton that is left when a "neutron decays inside the nucleus" and the process leading to a proton beeing emitted. You where looking for the process when the proton is beeing emitted togheter with the electron and (anti)neutrino, in the ordinary beta-minus decay. I dont think that is possible.