Free energy and criticality in the nucleon pair breaking process

Details Free energy and criticality in the nucleon pair breaking process Free energy and criticality in the nucleon pair breaking process

2002-09-19

arxiv.org/abs/nucl-ex/0209013v2

Phys.Rev. C68 (2003) 034311

Physics

Nuclear Physics

Nuclear Experiment

11 pages, including 6 figures, to be published in Physical Review C

Scientific paper

10.1103/PhysRevC.68.034311

Experimental level densities for 171,172Yb, 166,167Er, 161,162Dy, and 148,149Sm are analyzed within the microcanonical ensemble. In the even isotopes at excitation energies E < 2 MeV, the Helmholtz free energy F signals the transition from zero to two quasiparticles. For E > 2 MeV, the odd and even isotopes reveal a surprisingly constant F at a critical temperature Tc of appr. 0.5 MeV, indicating the continuous melting of nucleon Cooper pairs as function of excitation energy.

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