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<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

OAI identifier:
oai:epubs.surrey.ac.uk:345

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Surrey Research Insight

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