( ( Beta decay ) ( ( occurs ( when ( ( the nucleus ) ( ( ( emits ( ( ( an ( ( electron or ) positron ) ) and ) ( a neutrino ) ) ) , ) ( in ( ( a process ) ( that ( ( changes ( a proton ) ) ( to ( ( ( a neutron ) or ) ( the ( other ( way about ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Beta) (NN decay)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN nucleus)) (VP (VBZ emits) (NP (NP (DT an) (NN electron) (CC or) (NN positron)) (CC and) (NP (DT a) (NN neutrino))) (, ,) (PP (IN in) (NP (NP (DT a) (NN process)) (SBAR (WHNP (WDT that)) (S (VP (VBZ changes) (NP (DT a) (NN proton)) (PP (TO to) (NP (NP (DT a) (NN neutron)) (CC or) (NP (DT the) (JJ other) (NN way) (RB about))))))))))))) (. .)))
Beta decay occurs when the nucleus emits an electron or positron and a neutrino, in a process that changes a proton to a neutron or the other way about.
(ROOT (S (NP (NP (DT The) (NN electron)) (VP (VBN released) (PP (IN during) (NP (JJ beta) (NN decay))))) (VP (VBZ is) (RB not) (NP (NP (DT an) (JJ orbital) (NN electron)) (PP (CC but) (NP (NP (DT an) (NN electron)) (SBAR (WHNP (WP$ whose) (NNS origin)) (S (VP (VBD was) (PP (IN in) (NP (DT the) (NN nucleus)))))))))) (. .)))