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Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at {\surd}sNN = 2.76 TeV

B. Abelev Laurent Aphecetche 1 A. Baldisseri 2 Guillaume Batigne 1 I. Belikov 3 H. Borel 2 M. Bregant 1 J. Castillo Castellanos 2 J.L. Charvet 2 C. Cheshkov 4 B. Cheynis 5 H. Delagrange 1 O. Driga 1 L. Ducroux 4 Magali Estienne 1 Marie Germain 1 C. Geuna 2 B. Hippolyte 3 C. Kuhn 3 A. Lardeux 1 M. Lenhardt 1 L. Luquin 1 A. Maire 3 Gines Martinez Garcia 1 A. Mas 1 L. Massacrier 1, 5 A. Matyja 1 S. Pal 2 H. Pereira da Costa 2 Philippe Pillot 1 A. Rakotozafindrabe 2 C. Roy 3 S. Senyukov 3 Alexandre Shabetai 1 Diego Stocco 1 R. Tieulent 5 A. Uras 5 R. Vernet 6 H. Yang 2 Y. Zoccarato 5 Sang Un Ahn 7 Y.W. Baek 8 A. Baldit 8 V. Barret 8 N. Bastid 8 P. Crochet 8 A. Devaux 8 P. Dupieux 8 R. Ichou 8 X. Lopez 8 F. Manso 8 M. Marchisone 8 S. Porteboeuf-Houssais 8 P. Rosnet 8 B. Vulpescu 8 X. Zhang 8 N. Arbor 9 G. Conesa Balbastre 9 J. Faivre 9 C. Furget 9 R. Guernane 9 S. Kox 9 J.S. Real 9 C. Silvestre 9 B. Boyer 10 B. Espagnon 10 Y. le Bornec 10
Abstract : 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 {\surd}sNN = 2.76 TeV with neutron emission are {\sigma}_single EMD = 187.2{\pm}0.2 (stat.) +13.8-12.0 (syst.) b and {\sigma}_mutual EMD = 6.2 {\pm} 0.1 (stat.) {\pm}0.4 (syst.) b respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.
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B. Abelev, Laurent Aphecetche, A. Baldisseri, Guillaume Batigne, I. Belikov, et al.. Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at {\surd}sNN = 2.76 TeV. Physical Review Letters, American Physical Society, 2012, 109, pp.252302. ⟨10.1103/PhysRevLett.109.252302⟩. ⟨in2p3-00678456⟩

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