B(E1) Strengths from Coulomb Excitation of 11Be

Abstract

The $B$(E1;$1/2^{+}\to 1/2^{-}$) strength for ${}^{11}$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 ${}^{11}$Be+${}^{208}$Pb at 38.6 MeV/nucleon is reported. The $B$(E1) strength of 0.105(12) e${}^2$fm${}^2$ 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) e${}^2$fm${}^2$. This value is in good agreement with the value deduced independently from the lifetime of the $1/2^{-}$ state in ${}^{11}$Be, and has a comparable p recision.

5 pages, 2 figures, accepted for publication in Phys. Lett. B

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Cited by in corpus (10)

• Nuclear effective field theory: status and perspectives
• Electric properties of the Beryllium-11 system in Halo EFT
• Core excitation in the elastic scattering and breakup of ${}^{11}$Be on protons
• Determining $B(E1)$ distributions of weakly bound nuclei from breakup cross sections using Continuum Discretized Coupled Channels calculations. Application to ${}^{11}$Be
• Nuclear vector polarizability correction to hyperfine splitting
• Investigating the 10Li continuum through 9Li(d,p)10Li reactions
• On the measurement of B(E2, 0+ -> 2+) using intermediate-energy Coulomb excitation
• Scaling laws and higher-order effects in Coulomb excitation of neutron halo nuclei
• Computing nuclear response functions with time-dependent coupled-cluster theory
• Extended optical model analyses of ${}^{11}$Be+${}^{197}$Au with dynamic polarization potentials