Abstract
Dy nuclei have been measured by use of the Oslo method on data from pick-up and inelastic scattering reactions, respectively. The level densities for these dysprosium isotopes together with previously measured Dy are extracted in the region below the neutron binding energy. Thermodynamic properties are deduced within both micro-canonical and canonical ensemble theories. A phase transition from the pair-correlated state at low energies to a less correlated or uncorrelated state is studied in both ensembles. It is investigated whether the temperature of the nucleus is constant or a varying function of excitation energy. It is found that above an excitation energy of 3 MeV the temperature of all five dysprosium nuclei have a constant value within the experimental uncertainties. The impact of a constant-temperature level density versus a Fermi gas level density is discussed with respect to the canonical heat capacity.
6 More- Received 1 March 2011
DOI:https://doi.org/10.1103/PhysRevC.85.014323
©2012 American Physical Society