Naslov
B(E1) strengths from Coulomb excitation of 11Be

Autori
Summers, N.C. ; Pain, S.D. ; Orr, N. A. ; Catford, W.N. ; Angelique, J. C. ; Ashwood, N.I. ; Bouchat, V. ; Clarke, N.M. ; Curtis, N. ; Freer, M. ; Fulton, B.R. ; Hanappe, F. ; Labiche, M. ; Lecouey, J.L. ; Lemmon, R.C. ; Mahboub, D. ; Ninane, A. ; Normand, G. ; Nunes, F.N. ; Soić, Neven ; Stuttge, L. ; Timis, C.N. ; Thompson, I.J. ; Winfield, J.S. ; Ziman, V.

Izvornik
Physics Letters B (0370-2693) 650 (2007), 2-3; 124-128

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Coulomb excitation; extended continuum discretized coupled channels method; 11Be

Sažetak
The B(E1 ; 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(E1) 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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