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

J. Gibelin 1 D. Beaumel 1 T. Motobayashi Y. Blumenfeld 1 N. Aoi H. Baba Z. Elekes S. Fortier 1 N. Frascaria 1 N. Fukuda T. Gomi K. Ishikawa Y. Kondo T. Kubo V. Lima 1 T. Nakamura A. Saito Y. Satou J. A. Scarpaci 1 E. Takeshita S. Takeuchi T. Teranishi Y. Togano A. M. Vinodkumar Y. Yanagisawa K. Yoshida
1 IPNO - Institut de Physique Nucléaire d'Orsay
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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http://hal.in2p3.fr/in2p3-00577154
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Submitted on : Wednesday, March 16, 2011 - 3:26:04 PM
Last modification on : Thursday, December 31, 2020 - 1:18:02 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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