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Survival of cluster correlation in dissipative binary breakup of Mg-24,Mg-25*

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The role of alpha clustering in the binary complex fragment decay of fully energy-relaxed composites Mg-24,Mg-25*, formed in C-12,C-13 + C-12 reactions, has been studied. The inclusive isotopic energy distributions of the emitted fragments Li-6,Li-7 and Be-7,Be-8,Be-9 have been measured. The ratio of the measured fully dissipative (fissionlike) yields of each isotopic fragment obtained in the two reactions was compared with the corresponding statistical model prediction of the same. Unlike in the case of Li-6,Li-7 fragments, the measured yield ratios of Be-7,Be-8,Be-9 fragments were found to deviate substantially from the statistical model predictions of the same. The observed deviations were due to the enhancement in the measured yields of Be-7,Be-8,Be-9 fragments (with respect to the respective statistical model predictions) only in specific exit channels containing either O-16 or O-18, both well known alpha-cluster nuclei, as the complementary binary fragment. The present data indicated, for the first time, the survival and sustained influence of cluster correlations on dissipative binary decay of hot composites Mg-24,Mg-25* at excitation energy of similar to 2.25 MeV/nucleon.

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