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In this paper it is tried to provide a new approach to the problem of electron spin by reviewing the classical concept of
spin. It is exhibited that the big flaw in calculation of electron spin by classical concept and formulation is due to
intrinsic errors associated with any experiment to measure the amount of the radius of electron, i.e. the measured amount
of electron radius in any lab experiment will be much smaller than expected value and is varied depending on some
factors, the nature and the conditions that govern each experiment. It is tried to provide a mathematical analysis and
physical model to show that any change in kinetic energy of electron will change the rotational speed of electron slightly.
It is obvious that the rotational speed of electron should be very close to the light speed then any change of above
mentioned speed will result a great change in the radius of electron (Ehrenfest paradox) and measured mass of electron
in any specific experiment. In other words a small change of rotational speed due to the change of kinetic energy of
scattered particles in each experiment will result different values of measured radius of electron depending on the
conditions that govern any specific any experiment but it is showed that spin of electron remains fix in all experiments.
This phenomenon can be called relativistic asymptotic behavior. Most of lab experiments for calculation the radius of
electron are scattering of electron-particle , then any change of kinetic energy of electron will change the rotational speed
considerably .The concept of rest mass, contracted length and Ehrenfest paradox, are used to investigate the spin concept
by a novel method. A very direct consequence that can not be avoided to be mentioned is an interpretation to the concept
of anti-neutron that is mentioned in this paper too. It is also exhibited that the mathematical analysis of Compton effect
can be a strong proof for this model. As the following, the concept of proton spin and neutron spin is analyzed precisely.
Finally, a precise value for Planck constant is obtained according to the above mentioned model that can be a
confirmation to the provided mathematical analysis and modeling.
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