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Thesis 290A Mev12C nuclear reactions induced by latex particle tracks black , gray track particles , heavy ionizing particles and shower particles multiplicity distribution , launch angle distributions associated with various particle multiplicity has been studied , and with other high-energy heavy energy region ion induced nuclear reactions latex results were compared. The experimental results showed that: ( 1 ) black track particle , gray track and re- ionizing particle average multiplicity and rake nuclear size has a strong association with the shower particles average multiplicity associated with the rake nuclear size is very small ; ( 2 ) black track particle emission basically become isotropic angular distribution , but the forward slightly backward , gray track particle emission angle distribution follows exponential law , the angular distribution of shower particles emitted in the advance direction ; ( 3 ) black track particle , gray track particles , heavy ionizing particle multiplicity there is a strong correlation between the number , but the black track particle average multiplicity lt; nb gt; Sui ng, nh saturation effect of changes in the cluster outgoing particle average multiplicity lt; ns gt; Sui nb, ng, nh changes slowly , and lt; nb gt;, lt; ng gt;, lt; nh gt; increases with ns also showed increased first and then saturated trend, which was mainly due to lower energy projectiles , the collision rate of the shower particles smaller ; ( 4 ) forward and backward hemisphere black track particle emitted by the number of gray tracks with heavy particles are ionized particles increases nh increases, and lt; n bf gt;, lt; n gf gt; with nh magnitude of the increase is greater than lt; n bB gt;, lt; n gB gt; with nh magnitude of the increase , but after the hemisphere within the black track particle average multiplicity increases with nh have saturation.
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