Reduction of spectroscopic strength: Weakly-bound and strongly-bound single-particle states studied using one-nucleon knockout reactions

A. Gade, P. Adrich, D. Bazin, M. D. Bowen, B. A. Brown, C. M. Campbell, J. M. Cook, T. Glasmacher, P. G. Hansen, K. Hosier, S. McDaniel, D. McGlinchery, A. Obertelli, K. Siwek, L. A. Riley, J. A. Tostevin, and D. Weisshaar
Phys. Rev. C 77, 044306 – Published 10 April 2008

Abstract

Both one-proton and one-neutron knockout reactions were performed with fast beams of two asymmetric, neutron-deficient rare isotopes produced by projectile fragmentation. The reactions are used to probe the nucleon spectroscopic strengths at both the weakly and strongly bound nucleon Fermi surfaces. The one-proton knockout reactions Be9(S28,P27)X and Be9(Si24,Al23)X probe the weakly bound valence proton states and the one-neutron knockout reactions and Be9(S28, S27)X and Be9(Si24, Si23)X the strongly bound neutron states in the two systems. The spectroscopic strengths are extracted from the measured cross sections by comparisons with an eikonal reaction theory. The reduction of the experimentally deduced spectroscopic strengths, relative to the predictions of shell-model calculations, is of order 0.8–0.9 in the removal of weakly bound protons and 0.3–0.4 in the knockout of the strongly bound neutrons. These results support previous studies at the extremes of nuclear binding and provide further evidence that in asymmetric nuclear systems the nucleons of the deficient species, at the more-bound Fermi surface are more strongly correlated than those of the more weakly bound excess species.

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  • Received 27 September 2007

DOI:https://doi.org/10.1103/PhysRevC.77.044306

©2008 American Physical Society

Authors & Affiliations

A. Gade1,2, P. Adrich1, D. Bazin1, M. D. Bowen1,2, B. A. Brown1,2, C. M. Campbell1, J. M. Cook1,2, T. Glasmacher1,2, P. G. Hansen1,2, K. Hosier3, S. McDaniel1,2, D. McGlinchery3, A. Obertelli1, K. Siwek1,2, L. A. Riley3, J. A. Tostevin4, and D. Weisshaar1

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics and Astronomy, Ursinus College, Collegeville, Pennsylvania 19426, USA
  • 4Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

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Vol. 77, Iss. 4 — April 2008

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