A novel manifestation of alpha clustering in Po-212: Pure alpha-Pb-208 states revealed by their enhanced E1 decays
20115 pages
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- J.Phys.Conf.Ser. 312 (2011) 092014
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Abstract: (IOP)
Excited states in (212)Po have been populated by alpha transfer using the (208)Pb((18)O, (14)C) reaction and studied with the Euroball l multidetector array. The level scheme of (212)Po has been extended up to ~ 3.2 MeV excitation energy. Spin an d parity values have been assigned thanks to the measurements of l angular distributions and l- l angular correlations. Several l lines have been found to be shifted by the Doppler effect, allowing for the measurements of the associated lifetimes by th e DSAM method. The values, found in the [0.1-1.4] ps range, lead to very enhanced E1 transitions. The emitting states, which have non-natural parity values, are the fingerprints of the 'alpha-(208)Pb' structure present in (212)Po. They are in the same exc itation-energy range as the states issued from shell-model configurations.References(6)
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