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Decay Pattern of Pygmy States Observed in Neutron-Rich 26Ne

Abstract : Coulomb excitation of the exotic neutron-rich nucleus 26Ne on a 208Pb target was measured at 58  MeV/u in order to search for low-lying E1 strength above the neutron emission threshold. This radioactive beam experiment was carried out at the RIKEN Accelerator Research Facility. Using the invariant mass method in the 25Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV excitation energy. By performing a multipole decomposition of the differential cross section, a reduced dipole transition probability of B(E1)=0.49±0.16e2  fm2 is deduced, corresponding to 4.9±1.6% of the Thomas-Reiche-Kuhn sum rule. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is measured. The extracted decay pattern is not consistent with several mean-field theory descriptions of the pygmy states.
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Submitted on : Wednesday, March 16, 2011 - 3:26:04 PM
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J. Gibelin, D. Beaumel, T. Motobayashi, Y. Blumenfeld, N. Aoi, et al.. Decay Pattern of Pygmy States Observed in Neutron-Rich 26Ne. Physical Review Letters, American Physical Society, 2008, 101, pp.212503. ⟨10.1103/PhysRevLett.101.212503⟩. ⟨in2p3-00577154⟩



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