Coexistence of 'alpha+ 208Pb' cluster structures and single-particle excitations in 212Po

Abstract

Excited states in 212Po have been populated by alpha transfer using the 208Pb(18O,14C) reaction at 85MeV beam energy and studied with the EUROBALL IV gamma multidetector array. The level scheme has been extended up to ~ 3.2 MeV excitation energy from the triple gamma coincidence data. Spin and parity values of most of the observed states have been assigned from the gamma angular distributions and gamma -gamma angular correlations. Several gamma lines with E(gamma) < 1 MeV have been found to be shifted by the Doppler effect, allowing for the measurements of the associated lifetimes by the DSAM method. The values, found in the range [0.1-0.6] ps, lead to very enhanced E1 transitions. All the emitting states, which have non-natural parity values, are discussed in terms of alpha-208Pb structure. They are in the same excitation-energy range as the states issued from shell-model configurations.

21 pages, 19 figures, corrected typos, revised arguments in Sect. IIIC

References in corpus (3)

• Universal decay law in charged-particle emission and exotic cluster radioactivity
• A novel manifestation of $\alpha$-clustering: new '$\alpha$ + ${}^{208}$Pb' states in ${}^{212}$Po revealed by their enhanced E1 decays
• Structure of exotic nuclei around double shell closures

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• A revised $B(E2;2_1^{+}\to 0_1^{+})$ value in the semi-magic nucleus ${}^{210}$Po
• $\alpha$-cluster structures above double shell closures via double-folding potentials from chiral effective field theory
• Woods-Saxon-Gaussian Potential and Alpha-Cluster Structures of Alpha+Closed Shell Nuclei
• Alpha-Particle condensation in nuclear systems: present status and perspectives
• Revealing the nature of yrast states in neutron-rich polonium isotopes
• Electromagnetic Decay of Molecular States