Measurement of the sign of the spectroscopic quadrupole moment for the 21+ state in Se70: No evidence for oblate shape

A.M. Hurst, P.A. Butler, R.-D. Herzberg, G.D. Jones, E.S. Paul, M. Petri, P. Delahaye, F. Wenander, F. Ames, J. Cederkäll, S. Franchoo, G. Georgiev, U. Köster, T. Sieber, D.G. Jenkins, C.J. Barton, P. Kent, A. Steer, R. Wadsworth, T. BehrensT. Kröll, R. Krücken, A. Bürger, E. Clément, A. Görgen, A. Ekström, T. Czosnyka, J. Iwanicki, M. Zielińska, T. Davinson, G. De Angelis, J. Eberth, N. Warr, D. Weisshaar, M. Huyse, O. Ivanov, I. Stefanescu, J. Van De Walle, P. Van Duppen, A.C. Larsen, S. Siem, N.U.H. Syed, M. Nespolo, M. Pantea, H. Scheit, J.F. Smith

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Abstract

Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of Se70 ions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitation γ rays in the highly segmented MINIBALL γ-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2+ state is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the first 2+ state in Se70, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes. © 2007 The American Physical Society.
Original languageEnglish
Article number072501
Number of pages4
JournalPhysical Review Letters
Volume98
Issue number7
DOIs
Publication statusPublished - 15 Feb 2007

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