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Phys. Rev. Lett. 81, 2209–2212 (1998)

Measurement of E2 Transitions in the Coulomb Dissociation of 8B

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B. Davids1,2, D. W. Anthony1,3, Sam M. Austin1,2, D. Bazin1, B. Blank1,4, J. A. Caggiano1,2, M. Chartier1, H. Esbensen5, P. Hui1,*, C. F. Powell1,3, H. Scheit1,2, B. M. Sherrill1,2, M. Steiner1, P. Thirolf6, J. Yurkon1, and A. Zeller1
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
3Department of Chemistry, Michigan State University, East Lansing, Michigan 48824
4Centre d'Etudes Nucléaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex, France
5Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
6Ludwig Maximilians Universität München, Am Coulombwall 1, D-85748 Garching, Germany

Received 23 March 1998; published in the issue dated 14 September 1998

In an effort to understand the implications of Coulomb dissociation experiments for the determination of the 7Be(p,γ)8B reaction rate, longitudinal momentum distributions of 7Be fragments produced in the Coulomb dissociation of 44 and 81 MeV/nucleon 8B beams on a Pb target were measured. These distributions are characterized by asymmetries interpreted as the result of interference between E1 and E2 transition amplitudes in the Coulomb breakup. When interpreted in the context of a first order perturbation theory of Coulomb dissociation that assumes a single particle 8B structure model, this measurement yields SE2/SE1 = 6.7-1.9+2.8×10-4 at a fragment relative kinetic energy of 0.6 MeV.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.2209
DOI:
10.1103/PhysRevLett.81.2209
PACS:
25.60.Gc, 26.65.+t, 27.20.+n

*Present address: Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, MA 02173.

 
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