Level densities and thermodynamical properties of Pt and Au isotopes

Giacoppo, F. and Bello, Garrote F. L. and Bernstein, L. A. and Bleuel, D. L. and Eriksen, T. K. and Firestone, R. B. and Görgen, A. and Guttormsen, M. and Hagen, T. W. and Kheswa, B. V. and Klintefjord, M. and Koehler, P. E. and Larsen, A. C. and Nyhus, H. T. and Renstrøm, T. and Sahin, E. and Siem, S. and Tornyi, Tamás Gábor (2014) Level densities and thermodynamical properties of Pt and Au isotopes. PHYSICAL REVIEW C, 90 (5). ISSN 2469-9985

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Abstract

The nuclear level densities of Pt194-196 and Au197,198 below the neutron separation energy have been measured using transfer and scattering reactions. All the level density distributions follow the constant-temperature description. Each group of isotopes is characterized by the same temperature above the energy threshold corresponding to the breaking of the first Cooper pair. A constant entropy excess ΔS=1.9kB and 1.1kB is observed in Pt195 and Au198 with respect to Pt196 and Au197, respectively, giving information on the available single-particle level space for the last unpaired valence neutron. The breaking of nucleon Cooper pairs is revealed by sequential peaks in the microcanonical caloric curve.

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