<P> One of the historically important radiochemical methods of solar neutrino detection is based on inverse electron capture triggered by the absorption of an electron neutrino . Chlorine - 37 transmutes into argon - 37 via the reaction </P> <Dl> <Dd> Cl + ν → Ar + . </Dd> </Dl> <Dd> Cl + ν → Ar + . </Dd> <P> Argon - 37 then de-excites itself via electron capture (half - life = 35 d) into chlorine - 37 via the reaction </P>

How many subatomic particles (p n & e) in a neutral chlorine-36 an atomic no. for cl is 17