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In-beam gamma-ray spectroscopy of 190, 197Po |
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| Authors: | D R Wiseman A N Andreyev R D Page M B Smith I G Darby S Eeckhaudt T Grahn P T Greenlees P Jones R Julin S Juutinen H Kettunen M Leino A -P Leppänen M Nyman J Pakarinen P Rahkila M Sandzelius J Sarén C Scholey J Uusitalo |
| Institution: | 1. Department of Physics, Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK 2. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada 3. Department of Physics, University of Jyv?skyl?, FIN-40014, Jyv?skyl?, Finland 4. Department of Physics, Royal Institute of Technology, SE-106 91, Stockholm, Sweden |
| Abstract: | γ -ray transitions in the neutron-deficient nuclei 190, 197Po have been identified using the JUROGAM Ge detector array coupled to the RITU gas-filled separator and the GREAT spectrometer. The yrast band of 190Po has been firmly established through γ -γ coincidences and extended up to a spin and parity of 14+. It displays similar behaviour to its isotones 186Hg and 188Pb above the 4+ level, thus confirming its prolate nature. In 197Po the band built upon the 13/2+ isomer has been extended up to a spin and parity of 33/2+, while the non-yrast band has been observed for the first time. The behaviour of 197Po is found to be similar to that of the nearby even-mass isotopes, which is consistent with the model in which the i 13/2 neutron is weakly coupled to the states in the even-even core. |
| Keywords: | 23 20 Lv γ transitions and level energies 25 70 -z Low and intermediate energy heavy-ion reactions 27 80 +w 190 ⩽ A ⩽ 219 21 60 Ev Collective models |
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