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The statistical model is used to illustrate the consequences of a successive binary decay mechanism as the initial nuclear excitation is pushed towards the limits of stability. The partition of the excitation energy between light and heavy fragments is explicitly calculated, as are the consequences of the decay of the primary light fragments to particle-bound residual nuclei which would be observed experimentally. The test nucleus {sub 44}{sup 100}Ru is considered at initial excitations of 100, 200, 400, and 800 MeV. Exit channels of {ital n}, {ital p}, and {alpha} and 100 clusters of 3{le}{ital Z}{le}20, 6{le}{ital A}{le}48 are considered from all nuclides in the deexcitation cascade. The total primary and final cluster yields are shown versus {ital Z} and initial excitation. The primary versus final yields are also shown individually for {sup 12}C, {sup 26}Mg, and {sup 48}Ca. We show how multifragmentation yields will change with the excitation energy due to a successive binary decay mechanism. Measurements that may be prone to misinterpretation are discussed, as are those that should be representative of initial nucleus excitation.

Expectations of fragment decay from highly excited nuclei