Question

Explain Theory of antimatter and antiparticle ?

Answer 1

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this term antimatter was first used byArthur Schuster in two rather whimsical letters to Nature in 1898 in which he coined the term. He hypothesized antiatoms as whole antimatter solar systems and discussed the possibility of matter and antimatter annihilating each other. Schuster's ideas were not a serious theoretical proposal merely speculation, and like the previous ideas, differed from the modern concept of antimatter in that it possessed negative gravity.








it is a material composed of the antiparticle"partners" to the correspondingparticles of ordinary matter. A particle and its antiparticle have the same mass as one another, but opposite electric charge and other quantum numbers. For example= a proton has positive charge while an antiproton has negative charge. Formally, antimatter particles can be defined by their negative baryon number or lepton number, while matter particles have a positive baryon or lepton number.These two classes of particles are the antiparticle partners of one another. ordinary particles bind to form normal matter. example a positron the antiparticle of the electron and an antiproton the antiparticle of the proton can form anantihydrogen atom. Physical principles indicate that complex antimatter atomic nuclei are possible well as anti-atoms corresponding to the known chemical elements.

The process by which this inequality between matter antimatter particles developed is called baryogenesis

Antimatter in the form of anti-atoms is one of the most difficult materials to produce. 
matter and antimatter have exactly the same properties. This means a particle and its corresponding antiparticle must have identical masses and decay lifetime


Notation: One way to denote an antiparticle is by adding a bar over the particle's symbol.


use:: . In hospitals, radioactive molecules that emit antimatter particles are used for imaging in the technique known as positron emission tomography.