Isotopically resolved yields of intermediate-mass fragments from 12 C-and ls O-induced reactions on 58,64 Ni, nat Ag, and 197 Au at El A =84 MeV were measured. The systematic variation of the yield ratios with projectile and target shows that these fragments are produced by a mechanism that involves the whole target nucleus. It is demonstrated that, within a statistical interpretation, the isotope-yield ratios are a measure of the entropy and determine a relation between temperature and density at breakup.
Abstract. Inclusive cross sections of intermediate mass fragments from the reaction 84Kr-~-I97Au at ElA = 35 MeV were measured over the range 8 ~ < Olab < 70 ~ with a low detection threshold. A moving-source parameterization was used to fit the double-differential cross sections. The integrated cross section for fragment production exceeds the total reaction cross section thus indicating a large probability for multi-fragment processes. The deduced large temperature parameters can be explained by assuming emission from a rotating source. From the comparison to reactions with 12C and 4~ projectiles at E/A = 30 MeV a systematics of inclusive fragment production as a function of the projectile mass is obtained. 25.70.Lm; 25.70.Mn; 25.70.Pq to 3.6 GeV, they seem to be associated with the larger IMF multiplicities [ 11 ].
PACS:In this work the systematics of the inclusive IMF production is extended to heavier projectiles. We report cross sections for the reaction at E/A = 35 MeV which were measured with a low detection threshold over a large range of angles. The atomic number of the observed fragments extends from Z = 3 up to Z = 36. Fragments up to Z = 24 were included in the moving-source analysis of the measured double-differential cross sections. By comparing to data for the reactions 12C "q-197Au[12] and 4~ + !97Au [6], both at E/A = 30 MeV, the role of the projectile mass in this energy regime is investigated. This measurement also complements the numerous exclusive studies of the 84Kr + 197Au reaction which were conducted in order to discern the dominant mechanisms of fragment production [13][14][15][16][17].
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