Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at √sNN = 2.76 TeV
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The first measurement of neutron emission in electromagnetic dissociation of 208Pb nuclei at the LHC is presented. The measurement is performed using the neutron Zero Degree Calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √sNN = 2.76 TeV with neutron emission are σ_single EMD = 187.2±0.2 (stat.) +13.8−12.0 (syst.) b and σ_mutual EMD = 6.2 ± 0.1 (stat.) ±0.4 (syst.) b respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.
CitationAlme J, Erdal HA, Helstrup H, Hetland KF, Kileng B, Altinpinar S, Djuvsland Ø, Fehlker D, Haaland ØS, Huang M, Kanaki K, Langøy R, Larsen DT, Lien JA, Liu L, Lønne P, Nystrand J, Røed K, Røhrich D, Skjerdal K, Szostak AK, Ullaland K, Øvrebekk G, Wagner B, Yang S, Dordic O, Eyyubova G, Lindal S, Løvhøiden G, Milosevic J, Nilsson MS, Qvigstad H, Richter M, Skaali TB, Tveter TS, Wikne JC, Abelev B, Adam J, Adamová D, Adare AM, Aggarwal MM, Aglieri Rinella G, Agocs AG, Agostinelli A, Aguilar Salazar S, Ahammed Z, Ahmad N, Ahmad Masoodi A, Ahn SU, Akindinov A. Measurement of the cross section for electromagnetic dissociation with neutron emission in Pb-Pb collisions at root s(NN)=2.76 TeV. Physical Review Letters. 2012;109(25):252302
PublisherAmerican Physical Society
Copyright 2012 CERN, for the ALICE Collaboration