Question

neutrino is emitted
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Answer 1

Since the 1950s it has become clear that neutrinos exist as several types. In β− decay an “anti-neutrino” is formed, while a “neutrino” is emitted in β+ decay. Both these neutrinos are now referred to as electron neutrinos, v ¯ e and ve, respectively.

Answer 2

In β− decay an “anti-neutrino” is formed, while a “neutrino” is emitted in β+ decay. Both these neutrinos are now referred to as electron neutrinos, v ¯ e and ve, respectively. ... The three kinds of neutrinos all have their anti particles. They have spin, no charge (“quark charge zero”), but possibly a small mass.