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B (E 1) strengths from Coulomb excitation of 11Be

par Summers, N.C. N.C.;Pain, Steven;Nunes, Filomena Maciel;Catford, Wilton;Mahboub, Djelloul;Timis, C.N.;Thompson, Ian J.;Winfield, J.S. J.S.;Orr, Nigel;Angélique, Jean Claude;Lecouey, Jean Luc;Normand, G.;Ashwood, N.I.;Clarke, Nicholas;Curtis, N.;Freer, Martin;Soić, Neven;Ziman, V.A.;Bouchat, Virginie;Hanappe, Francis ;Fulton, Brian;Labiche, Marc;Lemmon, Roy;Ninane, A.;Stuttge, Louise
Référence Physics letters. Section B, 650, 2-3, page (124-128)
Publication Publié, 2007-06

Article révisé par les pairs

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Résumé :

The B (E 1 ; 1 / 2+ → 1 / 2-) strength for 11Be 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 11Be + 208Pb at 38.6 MeV/nucleon is reported. The B (E 1) strength of 0.105(12) e2 fm2 derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, in 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 fm2. This value is in good agreement with the value deduced independently from the lifetime of the 1 / 2- state in 11Be, and has a comparable precision. © 2007 Elsevier B.V. All rights reserved.