Muons were first discovered in the study of cosmic rays in the middle of the 1930s. Since the mass of a muon is about 207 times that of the electron, scientists thought at first they have found Yukawa’s particle. This is the intermediate mass particle between a proton and an electron and believed to be responsible for the strong (color) interaction among hadrons (i.e. between proton and neutron). In 1947, the true Yukawa’s particles were discovered. These are the three species of pions. Two years later, Hideki Yukawa (1907-81) was awarded the Nobel Prize for Physics for his theory of subnuclear interactions. Now scientists begin to question the physical purpose of muons. One perplexed physicist by the name of Isidor Isaac Rabi (1898-198who developed magnetic resonance (pioneering MRI) and was awarded the 1944 Nobel Prize for Physics asked the question: “Who ordered that?” Muons are truly natural purposeless particles, which has no clear reason for their existence and has no known practical engineering utility. Fortunately, they can decay within 3 microseconds (millionth of a second of time) into an electron, a muon neutrino, and an electron antineutrino.
Although muons can catalyze cold nuclear fusion reaction, its extremely short half-life can never make the reaction totally economical for industrial uses, for example, generating the energy of electrical power plants or for combustion engines in automobiles. The promise of cold fusion by muon-catalyzed reaction has now reached a dead end and no future experiment is anticipated. However, the question can still be asked: what would become the properties of a hydrogen atom whose orbiting electron is replaced by a muon? On the other hand, if the same electron is moving (rotational speed around the nucleus) at 0.9999767 the speed of light then its relativistic mass is also 207 times its rest mass. In this sense the atomic electron became a muon by reason of its orbital speed approaching the speed of light. There is no known technical method to increase the angular speed of an electron inside a hydrogen atom. However, inside a linear accelerator, for example, at Stanford Linear Accelerator Facility (SLAC), in Palo Alto, California, an electron can be accelerated such that its relativistic mass goes beyond the rest mass of muon reaching the rest mass of the tauon; and at exactly lightspeed, the relativistic mass of the electron is infinite.


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