We study both experimentally and theoretically the creation of a new physical entity, a particle in which the proton and electron form a stable pair with a tiny size typical for a nucleon. A new theoretical approach to study atomic, sub atomic and nuclear systems is suggested. In the framework of this new approach, which takes into account a submicroscopic concept of physics, we discuss similar experimental results of other researchers dealing with low energy nuclear reactions in a solid, plasma, sonofusion and the electrostatic field generated by piezocrystals. It is shown that the formation of sub atomic particles, which we name subatoms, involves an inerton cloud of an atom from the environment. The inerton cloud, as a carrier of mass, is absorbed by the electron and proton, which strongly couples these two particles in a new stable entity -the subhydrogen. Besides, we have generated a subhelium and argue the existence of subdeuterium. In addition to these subatoms there exist also nuclear pairs formed by a subatom with proton, deuteron and neutron.