Phys. Rev. C 71, 024905 (2005) [10 pages]Neutron emission in electromagnetic dissociation of ultrarelativistic Pb ionsReceived 17 December 2003; revised 23 July 2004; published 24 February 2005 New data on forward neutron emission in fragmentation of 30A-GeV 208Pb ions on Al, Cu, Sn, and Pb nuclei are presented. The measurements were performed at the CERN SPS in the framework of the ALICE-LUMI experiment. The measured cross sections are compared with predictions of the RELDIS model for electromagnetic interactions and with results of the abrasion-ablation model for hadronic interactions. The electromagnetic excitation of a Pb projectile followed by single- and double-neutron emission is found to be the dominant process in full agreement with theoretical estimations. The measured 1nX cross sections are generally well described. The measured 2nX data, which are 4–5 times lower than the 1nX data, are slightly underestimated by theory. Nevertheless, the sum of 1nX and 2nX cross sections is in good agreement with theory. This confirms the predictive power of the RELDIS model, which can be used to calculate the sum of 1nX and 2nX emission rates for the purpose of calibration of luminosity measurements in PbPb collisions at the Large Hadron Collider at CERN. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.024905
DOI:
10.1103/PhysRevC.71.024905
PACS:
25.75.-q, 25.70.De, 29.27.-a
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