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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Senior U.S. Scientist Humboldt Fellow on leave from SUNY-Stony Brook, NY
We acknowledge discussions with J. Blomqvist. Two of us, D.B.F. and M.L., wish to thank the HMI for its hospitality.
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Alber, D., Alfier, R., Bach, C.E. et al. Quadrupole and octupole collectivity in light Po isotopes. Z. Physik A - Hadrons and Nuclei 339, 225–229 (1991). https://doi.org/10.1007/BF01284056
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DOI: https://doi.org/10.1007/BF01284056