( Alternatively ( , ( ( the ( neutron addition ) ) ( ( can ( ( ( displace ( ( a proton ) ( in ( the nucleus ) ) ) ) , ) ( creating ( a ( ( ( ( nuclide ( of ( the ( same ( atomic mass ) ) ) ) ) but ) lower ) ( atomic number ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Alternatively)) (, ,) (NP (DT the) (NN neutron) (NN addition)) (VP (MD can) (VP (VB displace) (NP (NP (DT a) (NN proton)) (PP (IN in) (NP (DT the) (NN nucleus)))) (, ,) (S (VP (VBG creating) (NP (DT a) (ADJP (ADJP (JJ nuclide) (PP (IN of) (NP (DT the) (JJ same) (JJ atomic) (NN mass)))) (CC but) (ADJP (JJR lower))) (JJ atomic) (NN number)))))) (. .)))
Alternatively, the neutron addition can displace a proton in the nucleus, creating a nuclide of the same atomic mass but lower atomic number.
(ROOT (S (NP (NP (DT The) (NN mass)) (PP (IN of) (NP (NNS atoms)))) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons) (CC and) (NNS neutrons))))) (PP (IN in) (NP (NN nucleus))))) (. .)))