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Phys. Rev. C 56, R1–R4 (1997)

Coulomb excitation of the one-neutron halo nucleus 11Be

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M. Fauerbach1,2, M. J. Chromik1,2, T. Glasmacher1,2, P. G. Hansen1,2, R. W. Ibbotson2, D. J. Morrissey2,3, H. Scheit1,2, P. Thirolf4, and M. Thoennessen1,2
1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
2National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
3Department of Chemistry, Michigan State University, East Lansing, Michigan 48824
4Ludwig Maximilians Universität München, D-85748 Garching, Germany

Received 18 April 1997; published in the issue dated July 1997

An exotic beam of 11Be at 57–60 MeV/nucleon has been used for a study of the excitation cross section of the 320 keV first excited state in collisions with targets of Pb, Au, C, and Be. The deexcitation γ rays were observed in an array of position-sensitive NaI(Tl) detectors in coincidence with the scattered fragment. The reduced transition strengths B(E1) extracted for the heavy targets suggest a predominantly electric excitation mechanism. Although the B(E1) value is marginally in agreement with that obtained from the lifetime of the state, the deviation is of the size expected from higher-order Coulomb and nuclear effects. Excitations on the lighter targets have sizable nuclear contributions.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.56.R1
DOI:
10.1103/PhysRevC.56.R1
PACS:
27.20.+n, 25.60.-t, 25.70.De
 
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