Shape Coexistence in the Neutron-Deficient Even-Even Hg182-188 Isotopes Studied via Coulomb Excitation.

Summary, in English

Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with 2.85 MeV/nucleon mercury beams from REX-ISOLDE. Magnitudes and relative signs of the reduced E2 matrix elements that couple the ground state and low-lying excited states in Hg182-188 were extracted. Information on the deformation of the ground and the first excited 0+ states was deduced using the quadrupole sum rules approach. Results show that the ground state is slightly deformed and of oblate nature, while a larger deformation for the excited 0+ state was noted in Hg182,184. The results are compared to beyond mean field and interacting-boson based models and interpreted within a two-state mixing model. Partial agreement with the model calculations was obtained. The presence of two different structures in the light even-mass mercury isotopes that coexist at low excitation energy is firmly established.

• Author: N Bree; K Wrzosek-Lipska; A Petts; A Andreyev; B Bastin; M Bender; A Blazhev; B Bruyneel; P A Butler; J Butterworth; M P Carpenter; Joakim Cederkäll; E Clément; T E Cocolios; A Deacon; J Diriken; Andreas Ekström; C Fitzpatrick; L M Fraile; Ch Fransen; S J Freeman; L P Gaffney; J E García-Ramos; K Geibel; R Gernhäuser; T Grahn; M Guttormsen; B Hadinia; K Hadyńska-Kle K; M Hass; P-H Heenen; R-D Herzberg; H Hess; K Heyde; M Huyse; O Ivanov; D G Jenkins; R Julin; N Kesteloot; Th Kröll; R Krücken; A C Larsen; R Lutter; P Marley; P J Napiorkowski; R Orlandi; R D Page; J Pakarinen; N Patronis; P J Peura; E Piselli; P Rahkila; E Rapisarda; P Reiter; A P Robinson; M Scheck; S Siem; K Singh Chakkal; J F Smith; J Srebrny; I Stefanescu; G M Tveten; P Van Duppen; J Van de Walle; D Voulot; N Warr; F Wenander; A Wiens; J L Wood; M Zielińska
• Department/s: Nuclear physics
• Publishing year: 2014
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 112
• Issue: 16
• Links: http://dx.doi.org/10.1103/PhysRevLett.112.162701
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1079-7114