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Phys. Rev. Lett. 84, 35–38 (2000)

One-Neutron Knockout from Individual Single-Particle States of 11Be

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T. Aumann1,2, A. Navin1,3, D. P. Balamuth4, D. Bazin1, B. Blank5, B. A. Brown1,6, J. E. Bush4, J. A. Caggiano1,6, B. Davids1,6, T. Glasmacher1,6, V. Guimarães7, P. G. Hansen1,6, R. W. Ibbotson1, D. Karnes1, J. J. Kolata7, V. Maddalena1,6, B. Pritychenko1,6, H. Scheit1,6, B. M. Sherrill1,6, and J. A. Tostevin8
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
2Gesellschaft für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
3Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
4Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104
5Centre d'Etudes Nucléaires de Bordeaux-Gradignan, 33175 Gradignan Cedex, France
6Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
7Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
8Department of Physics, School of Physical Sciences, University of Surrey, Guildford, Surrey, GU2 5XH, United Kingdom

Received 1 June 1999; published in the issue dated 3 January 2000

The structure of the halo nucleus 11Be has been studied using the reaction 9Be(11Be,10Be+γ)X at 60 MeV/nucleon. The ground state structure of 11Be is determined by comparing the experimental cross sections to a calculation combining spectroscopic factors from the shell model with l-dependent single-particle cross sections obtained in an eikonal model. This experiment shows the dominant 1s single-particle character of the 11Be ground state and indicates a small contribution of 0d admixture in the wave function. After correction for the approximately 22% intensity to excited levels, a clean and precise distribution of parallel momentum for knockout from the 1s halo wave function is obtained for the first time.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.35
DOI:
10.1103/PhysRevLett.84.35
PACS:
21.10.Jx, 25.60.Gc, 25.60.Je, 27.20.+n
 
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