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Article
Report number arXiv:2209.04250 ; CERN-EP-2022-186
Title Neutron emission in ultraperipheral Pb-Pb collisions at sNN = 5.02 TeV
Author(s) ALICE Collaboration  Mostra tots els 1051 autors
Corporate author(s) The ALICE collaboration
Publication 2023-06-05
Imprint 07 Sep 2022
Number of pages 26
Note 26 pages, 5 captioned figures, 7 tables, authors from page 21, published version, figures at http://alice-publications.web.cern.ch/node/8400
Published in: Phys. Rev. C 107 (2023) 064902
DOI 10.1103/PhysRevC.107.064902
Subject category Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords electroweak interaction ; forward physics ; relativistic heavy ion physics ; experimental results ; Neutron emission ; Ultraperipheral collisions
Abstract In ultraperipheral collisions (UPCs) of relativistic nuclei without overlap of nuclear densities, the two nuclei are excited by the Lorentz-contracted Coulomb fields of their collision partners. In these UPCs, the typical nuclear excitation energy is below a few tens of MeV, and a small number of nucleons are emitted in electromagnetic dissociation (EMD) of primary nuclei, in contrast to complete nuclear fragmentation in hadronic interactions. The cross sections of emission of given numbers of neutrons in UPCs of 208Pb nuclei at sNN=5.02 TeV were measured with the neutron zero degree calorimeters (ZDCs) of the ALICE detector at the LHC, exploiting a similar technique to that used in previous studies performed at sNN=2.76 TeV. In addition, the cross sections for the exclusive emission of 1, 2, 3, 4 and 5 forward neutrons in the EMD, not accompanied by the emission of forward protons, and thus mostly corresponding to the production of 207,206,205,204,203Pb, respectively, were measured for the first time. The predictions from the available models describe the measured cross sections well. These cross sections can be used for evaluating the impact of secondary nuclei on the LHC components, in particular, on superconducting magnets, and also provide useful input for the design of the Future Circular Collider (FCC-hh).
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Copyright/License Publication: © 2023-2024 CERN (License: CC BY 4.0)
Preprint: © 2022-2024 CERN (License: CC-BY-4.0)
Submitted by javier.castillo.castellanos@cern.ch



 


 Registre creat el 2022-09-07, darrera modificació el 2024-11-27


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