Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2001-11-16
Phys.Rev. C65 (2002) 044318
Physics
Nuclear Physics
Nuclear Experiment
12 figures
Scientific paper
10.1103/PhysRevC.65.044318
The level densities and $\gamma$-strength functions of the weakly deformed $^{148}$Sm and $^{149}$Sm nuclei have been extracted. The temperature versus excitation energy curve, derived within the framework of the micro canonical ensemble, shows structures, which we associate with the break up of Cooper pairs. The nuclear heat capacity is deduced within the framework of both the micro canonical and the canonical ensemble. We observe negative heat capacity in the micro canonical ensemble whereas the canonical heat capacity exhibits an S-shape as function of temperature, both signals of a phase transition. The structures in the $\gamma$-strength functions are discussed in terms of the pygmy resonance and the scissors mode built on exited states. The samarium results are compared with data for the well deformed $^{161,162}$Dy, $^{166,167}$Er and $^{171,172}$Yb isotopes and with data from (n,$\gamma$)-experiments and giant dipole resonance studies.
Guttormsen M.
Ingeberg K.
Melby E.
Rekstad J.
Schiller Avraham
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