Probing the Collective Degrees of Freedom at the Proton Drip Line in the Extremely Neutron Deficient Hg-172
4th International Conference on Proton Emitting Nuclei and Related Topics, Bordeaux, France, 6 - 10 June 2011, vol.1409, (Full Text)
- Publication Type: Conference Paper / Full Text
- Volume: 1409
- Doi Number: 10.1063/1.3664145
- City: Bordeaux
- Country: France
- Istanbul University Affiliated: Yes
Abstract
Excited states in the extremely neutron-deficient isotope Hg-172 have been established for the first time. The Ru-96(Kr-78,2n) reaction was employed to populate excited states in Hg-172 with a cross section sigma approximate to 15 nb. The highly selective Recoil-Decay Tagging (RDT) technique was used to obtain clean in-beam gamma-ray spectra for Hg-172. The yrast ground-state band has tentatively been established up to I = 6 (h) over bar. The data have been interpreted within the framework of total Routhian surface and quasiparticle random phase approximation calculations. In addition to the well-known features of shape coexistence previously observed in light Hg isotopes, the systematic trends in the energy of the yrast 2(+) and 4(+) states in the chain of Hg isotopes indicate a pronounced vibrational collectivity which is reduced in strength, but at the same time shows a higher degree of harmonicity, as the neutron number decreases below the neutron midshell.