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Quadrupole and octupole collectivity in light Po isotopes |
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| Authors: | D. Alber R. Alfier C. E. Bach D. B. Fossan H. Grawe H. Kluge M. Lach K. H. Maier M. Schramm R. Schubart M. P. Waring L. Wood H. Hübel Jing -ye Zhang |
| Affiliation: | 1. Hahn-Meitner-Institut, Glienickerstrasse 100, W-1000, Berlin 39, Germany 4. Institut für Strahlen- und Kernphysik, Universit?t Bonn, Nussallee 14-16, W-5300, Bonn, Germany 5. State University of New York at Stony Brook, 11794, NY, USA |
| Abstract: | The level structure of196Po has been studied using a160Dy(40Ar, 4n) reaction and a recoil-catcher technique to reduce fission. The results showed a sharp drop off in the first (2+) and (4+) energies relative to systematics implying an abrupt increase in the quadrupole collectivity at N=112. In addition, second (2+) and(4+) states were identified at 859 and 1388 keV, respectively, suggesting the discovery of a 4p2h deformed band in Po isotopes which is related to known 2p2h proton bands in several Pb isotopes. A prompt183W(20Ne, 5n@#@) experiment located similar second 2+ and 4+ states at 1039 and 1483 keV in198Po providing corroboration and extended information on the properties of the new Po deformed bands. A measured halflife of 850 (90) ns for the 2491 keV (11?) state in196Po implied collective E3 contributions to the extractedB (@#@ E3; 11?→8+)=27(5) W.u. |
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