Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 67: Poster Session
HK 67.7: Poster
Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max
EGoS - an observable for centrifugal stretching — •Jacob Beller1, Norbert Pietralla1, and Thomas Pissulla2 — 1IKP TU Darmstadt — 2IKP Koeln
A systematic investigation of the ground-state bands of deformed nuclei using EGoS-plots (Eγ over Spin = Eγ(J ↦ J−2)/J) has been done. Many nuclei show a maximum in the EGoS-plot, which is neither expected for rigid rotors nor for vibrational nuclei. Therefore, two potentials within the geometric collective model, namely the Confined-β-Soft rotor model (CBS) [1] and the Davidson-potential [2], were used to describe the data. Good agreement between the CBS and experimental data is achieved for all nuclei, while the Davidson-potential and the data differ near the critical point solution X(5) [3]. Here the wavefunctions obtained from the Davidson-potential show stronger centrifugal stretching than the CBS-wavefunctions in disagreement with the data.
We conclude that EGoS-plots show a particular and easy-to-obtain sensitivity to the phenomenon of centrifugal stretching.
[1] N. Pietralla and O.M. Gorbachenko, Phys. Rev. C 70, 011303(R) (2004)
[2] P.M. Davidson, Proc. R. Soc. London, Ser. A 135, 459 (1932)
[3] F. Iachello, Phys. Rev. Lett. 85, 3580 (2001)