( It ( ( is ( ( the ( diametrically ( opposite process ) ) ) ( of ( ( ( nuclear fission ) , ) ( ( in which ) ( ( ( an atom ) ( of ( the ( heavy ( isotope Uranium-238 ) ) ) ) ) ( is ( ( ( ( split ( in ( a collision ) ) ) ( with ( an ( accelerated neutron ) ) ) ) , ) ( ( releasing ( some ( of ( the energy ) ) ) ) ( from ( inside ( the atom ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (NP (NP (DT the) (JJ diametrically) (JJ opposite) (NN process)) (PP (IN of) (NP (NP (JJ nuclear) (NN fission)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NP (DT an) (NN atom)) (PP (IN of) (NP (DT the) (JJ heavy) (NN isotope) (NN Uranium-238)))) (VP (VBZ is) (VP (VBN split) (PP (IN in) (NP (DT a) (NN collision))) (PP (IN with) (NP (DT an) (JJ accelerated) (NN neutron))) (, ,) (S (VP (VBG releasing) (NP (NP (DT some)) (PP (IN of) (NP (DT the) (NN energy)))) (PP (IN from) (PP (IN inside) (NP (DT the) (NN atom)))))))))))))) (. .)))
It is the diametrically opposite process of nuclear fission, in which an atom of the heavy isotope Uranium-238 is split in a collision with an accelerated neutron, releasing some of the energy from inside the atom.
(ROOT (S (NP (DT A) (NN neutron)) (VP (VBZ collides) (PP (IN with) (NP (NP (DT an) (NN atom)) (PP (IN of) (NP (ADJP (JJ u-235) (PP (IN during) (NP (DT the) (JJ basic) (JJ nuclear) (NN fission)))) (NN process)))))) (. .)))
A neutron collides with an atom of u-235 during the basic nuclear fission process.