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The nuclear level densities of $^{194-196}$Pt and $^{197,198}$Au below theneutron separation energy have been measured using transfer and scatteringreactions. All the level density distributions follow the constant-temperaturedescription. Each group of isotopes is characterized by the same temperatureabove the energy threshold corresponding to the breaking of the first Cooperpair. A constant entropy excess $\Delta S=1.9$ and $1.1$ $k_B$ is observed in$^{195}$Pt and $^{198}$Au with respect to $^{196}$Pt and $^{197}$Au,respectively, giving information on the available single-particle level spacefor the last unpaired valence neutron. The breaking of nucleon Cooper pairs isrevealed by sequential peaks in the microcanonical caloric curve.

Level densities and thermodynamical properties of Pt and Au isotopes