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25 April 2024

» pubmed » pmid17359019

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Measurement of the sign of the spectroscopic quadrupole moment for the 2(1)+ state in 70Se: no evidence for oblate shape
A M Hurst ; P A Butler ; D G Jenkins ; P Delahaye ; F Wenander ; F Ames ; C J Barton ; T Behrens ; A Bürger ; J Cederkäll ; E Clément ; T Czosnyka ; T Davinson ; G de Angelis ; J Eberth ; A Ekström ; S Franchoo ; G Georgiev ; A Görgen ; R-D Herzberg ; M Huyse ; O Ivanov ; J Iwanicki ; G D Jones ; P Kent ; U Köster ; T Kröll ; R Krücken ; A C Larsen ; M Nespolo ; M Pantea ; E S Paul ; M Petri ; H Scheit ; T Sieber ; S Siem ; J F Smith ; A Steer ; I Stefanescu ; N U H Syed ; J Van de Walle ; P Van Duppen ; R Wadsworth ; N Warr ; D Weisshaar ; M Zieli?ska ;
Date:	16 Feb 2007
Journal:	Phys Rev Lett, 98 (7), 072501
Abstract:	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 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+ 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.
Source:	PubMed, pmid17359019
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