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

By 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


<p>Both<sup> </sup>one-proton and one-neutron knockout reactions were performed with fast beams<sup> </sup>of two asymmetric, neutron-deficient rare isotopes produced by projectile fragmentation.<sup> </sup>The reactions are used to probe the nucleon spectroscopic strengths<sup> </sup>at both the weakly and strongly bound nucleon Fermi surfaces.<sup> </sup>The one-proton knockout reactions <sup>9</sup>Be(<sup>28</sup>S,<sup>27</sup>P)X and <sup>9</sup>Be(<sup>24</sup>Si,<sup>23</sup>Al)X probe the weakly<sup> </sup>bound valence proton states and the one-neutron knockout reactions and<sup> </sup><sup>9</sup>Be(<sup>28</sup>S, <sup>27</sup>S)X and <sup>9</sup>Be(<sup>24</sup>Si, <sup>23</sup>Si)X the strongly bound neutron states<sup> </sup>in the two systems. The spectroscopic strengths are extracted from<sup> </sup>the measured cross sections by comparisons with an eikonal reaction<sup> </sup>theory. The reduction of the experimentally deduced spectroscopic strengths, relative<sup> </sup>to the predictions of shell-model calculations, is of order 0.8–0.9<sup> </sup>in the removal of weakly bound protons and 0.3–0.4 in<sup> </sup>the knockout of the strongly bound neutrons. These results support<sup> </sup>previous studies at the extremes of nuclear binding and provide<sup> </sup>further evidence that in asymmetric nuclear systems the nucleons of<sup> </sup>the deficient species, at the more-bound Fermi surface are more<sup> </sup>strongly correlated than those of the more weakly bound excess<sup> </sup>species.</p

Year: 2008
DOI identifier: 10.1103/PhysRevC.77.044306
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