B(E1) strengths from Coulomb excitation of 11Be

PRECISION MEASUREMENTS OF THE B(E1) STRENGTHS IN 11Be

“…The deduced B(E1) from the current work is consistent with the previous reported values from intermediate energy Coulomb excitation of Refs. [6][7][8] and is ∼12% lower than the reported value from the DSAM measurement.…”

“…4 9 which had a problem with normalization, verified an enhanced transition strength between the bound states with a weighted B(E1) average of 0.105 (7). 8 The analysis of the Coulomb excitation experiments at E( 11 Be) = 60 and 64 MeV/nucleon 6,7 use a semi-classical model which assume that the excitation occurs in a single-step process and does not include corrections due to the continuum and higher order effects, such as nuclear absorption and excitation. A model dependent analysis at 39 and 59 MeV/nucleon 8 using the quantum mechanical reaction code, the extended continuum discretized coupled channels model (XCDCC), 10 indicted that the continuum, nuclear and higher order effects enhance/suppress ∼2-20% of the strength.…”

Scaling laws and higher-order effects in Coulomb excitation of neutron halo nuclei

“…A well developed method to study halo nuclei is Coulomb excitation. An instructive example is the excitation of the 1/2 − bound state in 11 Be from the 1/2 + ground state [1,2,3,4]. Halo nuclei are a low-energy phenomenon and can be described effectively in terms of a few low-energy parameters.…”

“…In a recent paper the B(E1; 1/2 + → 1/2 − ) strength for 11 Be has been determined from intermediate energy Coulomb excitation measurements [1]. In order to analyse such kind of data in terms of electromagnetic matrix elements it is certainly necessary to use rather sophisticated codes which take higher-order electromagnetic and nuclear effects into account.…”

“…It is the purpose of this paper to provide such analytical Send offprint requests to: S.Typel results. In the theoretical analysis of [1], quite a complicated XCDCC method was used, which is required for a quantitative description of the experimental data, but it may tend to obscure the understanding of the simple physical mechanism of Coulomb excitation. 11 Be is an archetype of a halo nucleus with a 10 Be core and a single halo neutron in the 2s 1/2 state.…”