In this work we have used the classical neutron model of proton and nuclear electron in combination with the findings of projection theory, according to which the neutron is a cube and its interior lies below the spatial resolution, where the physical laws of our space-time world only apply to a limited extent and consequently the objections raised against this model by established physics do not apply. The electron does not reside in the entire cubic interior, but in a potential sphere (r = 6.355181 10-16 m) around the positron. This potential space is statistically occupied by the electron by random jumps with a jump duration of tmin. From the statistical frequency of the individual potential energies, the mean mass of the neutron was calculated to be 1.674927328 . 10-27 kg. The potential jumps mentioned above lead to a change in the size of the neutron at a constant elementary particle density in the rhythm of the jumps (oscillation model). The β-decay is caused by jumps of the electron to the outer surface of the neutron, where they are ejected from the neutron by membrane oscillation, whereby only 1/6 of the oscillation energy is transferred to the electron as kinetic energy. This is the real secret of the missing energy in the decay spectrum of the neutron. Two curves were constructed to calculate the decay curve. The base curve reflects the energetic and geometric conditions in the potential space of the electron, while the second, the jump curve, takes into account the individual jumps to the respective points on the neutron surface. The superposition of these two curves resulted in a curve that is in excellent agreement with the experimentally determined curves, in which the irregular curve progression at the maximum of the measurement curves is also very well reproduced, which to our knowledge is not the case with the calculations of established physicists. Neutrinos are not required in our obviously accurate model. In the last section, the conversion factor between time and length was calculated as 1 m4/3/s for the interior of the neutron. This contradicts the calculations of the same factor for the world outside the neutron with 61.66801 m4/3/s, which impressively confirms our initial hypothesis of deviating physics inside the neutron.