Isotope thermometry in nuclear multifragmentation

A systematic study of the effect of fragment-fragment interaction, quantum statistics, gamma-feeding, and collective flow is made in the extraction of the nuclear temperature from the double ratio of the isotopic yields in the statistical model of one-step (prompt) multifragmentation. Temperature is also extracted from the isotope yield ratios generated in the sequential binary-decay model. Comparison of the thermodynamic temperature with the extracted temperatures for different isotope ratios show some anomaly in both models which is discussed in the context of experimentally measured caloric curves. [S0556-2813(99)06002-1].