Lifetimes of superdeformed rotational states in <sup>36</sup>Ar
Svensson CE., Macchiavelli AO., Juodagalvis A., Poves A., Ragnarsson I., Åberg S., Appelbe DE., Austin RAE., Ball GC., Carpenter MP., Caurier E., Clark RM., Cromaz M., Deleplanque MA., Diamond RM., Fallon P., Janssens RVF., Lane GJ., Lee IY., Nowacki F., Sarantites DG., Stephens FS., Vetter K., Ward D.
Lifetimes have been measured in a superdeformed rotational band recently identified in the N = Z nucleus 36Ar. A large low-spin quadrupole deformation (β2=0.46±0.03) is confirmed and a decrease in the collectivity is observed as the high-spin band termination at Iπ=16+ is approached. Detailed comparisons of the experimental B(E2) values with the results of cranked Nilsson-Strutinsky and large-scale (s1/2d3/2)-pf spherical shell model calculations indicate the need for a more refined treatment of transition matrix elements close to termination in the former, and the inclusion of the complete sd-pf model space in the latter description of this highly-collective rotational band.