Clustering in Alpha Conjugate Nuclei Reactions

Reaction products from alpha conjugate nuclei systems of 35 MeV/u $^{40}$Ca $+ ^{40}$Ca, $^{40}$Ca $+$ $^{12}$C, $^{40}$Ca $ + ^{181}$Ta, $^{28}$Si $+ ^{28}$Si, $^{28}$Si $+$ $^{12}$C and $^{28}$Si $ + ^{181}$Ta are presented. Alpha particles and alpha conjugate fragments emitted in these reactions are observed with large probabilities. Alpha particles appear to be emitted from a neck like source. Reactions are compared to model calculations and interesting similarities and differences are discussed.