Measurement of the Sign of the Spectroscopic Quadrupole Moment for the 2{sub 1}{sup +} State in {sup 70}Se: No Evidence for Oblate Shape
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
- Department of Physics, University of York, York YO10 5DD (United Kingdom)
- ISOLDE, CERN, CH-1211 Geneva 23 (Switzerland)
- Physik Department E12, Technische Universitaet Muenchen, 85748 Garching (Germany)
Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of {sup 70}Se 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 {gamma} rays in the highly segmented MINIBALL {gamma}-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2{sup +} 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{sup +} state in {sup 70}Se, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.
- OSTI ID:
- 20955466
- Journal Information:
- Physical Review Letters, Vol. 98, Issue 7; Other Information: DOI: 10.1103/PhysRevLett.98.072501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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