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    B(E1) Strengths from Coulomb Excitation of 11Be

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    The BB(E1;1/2+1/21/2^+\to1/2^-) strength for 11^{11}Be has been extracted from intermediate energy Coulomb excitation measurements, over a range of beam energies using a new reaction model, the extended continuum discretized coupled channels (XCDCC) method. In addition, a measurement of the excitation cross section for 11^{11}Be+208^{208}Pb at 38.6 MeV/nucleon is reported. The BB(E1) strength of 0.105(12) e2^2fm2^2 derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, i n contrast to an anomalously low result obtained at 43 MeV/nucleon. By coupling a multi-configuration description of the projectile structure with realistic reaction theory, the XCDCC model provides for the first time a fully quantum mechanical description of Coulomb excitation. The XCDCC calculations reveal that the excitation process involves significant contributions from nuclear, continuum, and higher-order effects. An analysis of the present and two earlier intermediate energy measurements yields a combined B(E1) strength of 0.105(7) e2^2fm2^2. This value is in good agreement with the value deduced independently from the lifetime of the 1/21/2^- state in 11^{11}Be, and has a comparable p recision.Comment: 5 pages, 2 figures, accepted for publication in Phys. Lett.
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