Superfluid to normal phase transition and extreme regularity of superdeformed bands

Details Superfluid to normal phase transition and extreme regularity of superdeformed bands Superfluid to normal phase transition and extreme regularity of superdeformed bands

2002-01-19

arxiv.org/abs/nucl-th/0201051v1

Phys.Atom.Nucl. 65 (2002) 1198-1218; Yad.Fiz. 65 (2002) 1230-1250

Physics

Nuclear Physics

Nuclear Theory

30 pages in LaTeX, 6 figures (PostScript). To be published in Yadernaya Fizika (Physics of Atomic Nuclei), special edition ded

Scientific paper

10.1134/1.1495019

We derive the exact semiclassical expression for the second inertial parameter $\cal B$ for the superfluid and normal phases. Interpolation between these limiting values shows that the function ${\cal B}(I)$ changes sign at the spin $I_c$, which is critical for a rotational spectrum. The quantity $\cal B$ turns out to be a sensitive measure of the change in static pairing correlations. The superfluid-to-normal transition reveals itself in the specific variation of the ratio ${\cal B}/{\cal A}$ versus spin $I$ with the plateau characteristic of the normal phase. We find this dependence to be universal for normal deformed and superdeformed bands. The long plateau with a small value ${\cal B}/{\cal A}\sim A^{-8/3}$ explains the extreme regularity of superdeformed bands.

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