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In a supernova explosion, neutron capture reactions take place, leading to the formation of heavy elements. There are two processes of neutron capture called rapid process (r-process) and the slow process (s-process) so these reactions lead to formation of different elements like: silicon, sulfur, chlorine, argon, sodium, potassium, calcium, scandium, titanium and iron peak elements (around mass number A=60): vanadium, chromium, manganese, iron, cobalt and nickel; gold, platinum, lead, hydrogen, oxygen are also formed. Radioactive titanium-44 in supernova remnant 1987A have been detected for the first time.

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