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Novel Manifestation of alpha-Clustering Structures: New "alpha+Pb-208" States in Po-212 Revealed by Their Enhanced E1 Decays

Abstract : Excited states in 212Po were populated by α transfer using the 208Pb(18O,14C) reaction, and their deexcitation γ rays were studied with the Euroball array. Several levels were found to decay by a unique E1 transition (Eγ<1  MeV) populating the yrast state with the same spin value. Their lifetimes were measured by the Doppler-shift attenuation method. The values, found in the range 0.1–1.4 ps, lead to very enhanced transitions, B(E1)=2×10-2–1×10-3  W.u. These results are discussed in terms of an α-cluster structure which gives rise to states with non-natural-parity values, provided that the composite system cannot rotate collectively, as expected in the “α+208Pb” case. Such states due to the oscillatory motion of the α-core distance are observed for the first time.
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http://hal.in2p3.fr/in2p3-00457474
Contributor : Sophie Heurteau <>
Submitted on : Wednesday, February 17, 2010 - 2:43:13 PM
Last modification on : Wednesday, September 16, 2020 - 4:17:32 PM

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A. Astier, P. Petkov, M. G. Porquet, D. S. Delion, P. Schuck. Novel Manifestation of alpha-Clustering Structures: New "alpha+Pb-208" States in Po-212 Revealed by Their Enhanced E1 Decays. Physical Review Letters, American Physical Society, 2010, 104, 042701 [4 p.]. ⟨10.1103/PhysRevLett.104.042701⟩. ⟨in2p3-00457474⟩

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