The difference between an antideuteron and a deuteron is that the former is made up of an antiproton and an antineutron, while the latter is made up of one ordinary proton and one ordinary neutron. Nonetheless, the former is physically classified as antimatter, while the latter are found only among ordinary matter. With the exception of ordinary hydrogen, both proton and neutron can be found inside the nucleus of every atom as classified in the periodic table of chemical elements. The theory of chemical element composition states that the differences in the proton number are used to classify distinct chemical element, while the differences in neutron number are used to classify the isotopes of each of the elements. For example, ordinary hydrogen atom has no neutron, while its isotope called deuterium has one neutron and its isotope called tritium has two neutrons. Although ordinary matter occurs naturally and abundantly throughout the visible universe, antimatter can only be artificially created inside the particle accelerators of high energy physics. In fact, it is the creation and subsequent storage of large number of antiprotons that provided the possibility of high energy experimentations within the LHC facilities found at CERN.
Because of their electric charge neutrality, antineutrons might not be as easy to produce and to store as antiprotons. However, if antiprotons and antineutrons are coerced to interact with themselves then the products are most likely antideuterons. Although the fusion of two ordinary deuterons simply produces excess energy plus one helium nucleus (very fast moving helium nuclei are also called alpha particles in the science of radioactivity) and the fusion of two antideuterons also produces excess energy plus one antihelium nucleus, but ideally, the fusion of one antideuteron and one ordinary deuteron can only produce pure energy without any other byproducts. These two possibilities of elementary particle interactions can be tested in the accelerators of high energy physics. Both interactions produce excess heat and useful energy. But there is a big difference that one produces more energy than the other.


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