( ( ( The modification ) ( of ( ( free ( particle properties ) ) ( in ( nuclear matter ) ) ) ) ) ( ( ( ( becomes ( increasingly significant ) ) , ) ( if ( ( ( the ( average distance ) ) ( between nucleons ) ) ( ( decreases ( , ( that is ) ) ) ( with ( ( increasing density ) ( of ( the ( nuclear matter ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN modification)) (PP (IN of) (NP (NP (JJ free) (NN particle) (NNS properties)) (PP (IN in) (NP (JJ nuclear) (NN matter)))))) (VP (VBZ becomes) (ADJP (RB increasingly) (JJ significant)) (, ,) (SBAR (IN if) (S (NP (NP (DT the) (JJ average) (NN distance)) (PP (IN between) (NP (NNS nucleons)))) (VP (VBZ decreases) (PRN (, ,) (INTJ (DT that) (VBZ is))) (PP (IN with) (NP (NP (VBG increasing) (NN density)) (PP (IN of) (NP (DT the) (JJ nuclear) (NN matter))))))))) (. .)))
The modification of free particle properties in nuclear matter becomes increasingly significant, if the average distance between nucleons decreases, that is with increasing density of the nuclear matter.
(ROOT (S (NP (NP (NNP Density)) (PP (IN of) (NP (NN matter)))) (VP (VBZ reflects) (SBAR (WHADVP (WRB how) (RB closely)) (S (VP (VBD packed) (SBAR (S (NP (NP (DT the) (NNS particles)) (PP (IN of) (NP (NN matter)))) (VP (VBP are)))))))) (. .)))