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T. Aumann; A. Navin; D. P. Balamuth; D. Bazin; B. Blank; B. A. Brown; J. E. Bush; J. A. Caggiano; B. Davids; T. Glasmacher; V. Guimarães; P. G. Hansen; R. W. Ibbotson; D. Karnes; J. J. Kolata; V. Maddalena; B. Pritychenko; H. Scheit; B. M. Sherrill; J. A. Tostevin

doi:10.1103/PhysRevLett.84.35

One-Neutron Knockout from Individual Single-Particle States of ${}^{11}B e$

T. Aumann, A. Navin, D. P. Balamuth, D. Bazin, B. Blank, B. A. Brown, J. E. Bush, J. A. Caggiano, B. Davids, T. Glasmacher, V. Guimarães, P. G. Hansen, R. W. Ibbotson, D. Karnes, J. J. Kolata, V. Maddalena, B. Pritychenko, H. Scheit, B. M. Sherrill, and J. A. Tostevin

Phys. Rev. Lett. 84, 35 – Published 3 January 2000

Abstract

The structure of the halo nucleus $^{11} Be$ has been studied using the reaction $^{9} Be (^{11} Be,^{10} Be + γ) X$ at 60 MeV/nucleon. The ground state structure of $^{11} Be$ 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 $1 s$ single-particle character of the $^{11} Be$ ground state and indicates a small contribution of $0 d$ 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 $1 s$ halo wave function is obtained for the first time.

Received 1 June 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.35

Authors & Affiliations

T. Aumann^1,2, A. Navin^1,3, D. P. Balamuth⁴, D. Bazin¹, B. Blank⁵, B. A. Brown^1,6, J. E. Bush⁴, J. A. Caggiano^1,6, B. Davids^1,6, T. Glasmacher^1,6, V. Guimarães⁷, P. G. Hansen^1,6, R. W. Ibbotson¹, D. Karnes¹, J. J. Kolata⁷, V. Maddalena^1,6, B. Pritychenko^1,6, H. Scheit^1,6, B. M. Sherrill^1,6, 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