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Measurement of the sign of the spectroscopic quadrupole moment for the 21+ state in 70Se: no evidence for oblate shape

Hurst, A.M., Butler, P.A., Jenkins, D.G., Delahaye, P., Wenander, F., Ames, F., Barton, C.J., Behrens, T., Bürger, A., Cederkäll, J., Clément, E., Czosnyka, T., Davinson, T., de Angelis, G., Eberth, J., Ekström, A., Franchoo, S., Georgiev, G., Görgen, A., Herzberg, R-D., Huyse, M., Ivanov, O., Iwanicki, J., Jones, G.D., Kent, P., Köster, U., Kröll, T., Krücken, R., Larsen, A.C., Nespolo, M., Pantea, M., Paul, E.S., Petri, M., Scheit, H., Sieber, T., Siem, S., Smith, J.F., Steer, A., Stefanescu, I., Syed, N.U.H., Van de Walle, J., Van Duppen, P., Wadsworth, R., Warr, N., Weisshaar, D. and Zielińska, M. (2007) Measurement of the sign of the spectroscopic quadrupole moment for the 21+ state in 70Se: no evidence for oblate shape. Physical Review Letters, 98 (7). Art. No. 072501. ISSN 1079-7114

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Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of 70Se 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 rays in the highly segmented MINIBALL -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 70Se, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 31 Jul 2009 12:50
Last Modified: 31 Jul 2009 12:50
Published Version: http://dx.doi.org/10.1103/PhysRevLett.98.072501
Status: Published
Publisher: The American Physical Society.
Identification Number: 10.1103/PhysRevLett.98.072501
URI: http://eprints.whiterose.ac.uk/id/eprint/7285

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