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

Summers, NC, Pain, SD, Orr, NA, Catford, WN, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, BR, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, RC, Mahboub, D, Ninane, A, Normand, G, Nunes, FM, Soic, N, Stuttge, L, Timis, CN, Thompson, IJ, Winfield, JS and Ziman, V (2007) B(E1) strengths from Coulomb excitation of Be-11 PHYSICS LETTERS B, 650 (2-3). 124 - 128. ISSN 0370-2693


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The B(E1; 1/2(+) --> 1/2(-)) strength for Be-11 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 Be-11 + Pb-208 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, 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) e(2) fm(2). This value is in good agreement with the value deduced independently from the lifetime of the 1/2(-) state in Be-11, and has a comparable precision. (C) 2007 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, COUPLED-CHANNELS, CORE EXCITATION, HEAVY-IONS
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Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:07
Last Modified: 23 Sep 2013 18:27

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