Three beta decay equations are given, the first two were shown in the video titled 'Beta Decay I' without any answers. A more modern symbol for the antineutrino replaces the zeros to the left of the Greek letter nu with a right-subscripted lower-case e. The e symbolizes that this is an electron antineutrino, as opposed to muon or tau antineutrinos. Cobalt-60 was the isotope used in the discovery of the nonconservation of parity: http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/betaex.html
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