Neutron emission in ultraperipheral Pb-Pb collisions at $\sqrt {s_{NN}}$ = 5.02 TeV - INSPIRE

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Neutron emission in ultraperipheral Pb-Pb collisions at $\sqrt {s_{NN}}$ = 5.02 TeV

ALICE

Collaboration

Sep 9, 2022

26 pages

Published in:

Phys.Rev.C 107 (2023) 6, 064902

Published: Jun 5, 2023

e-Print:

2209.04250 [nucl-ex]

DOI:

10.1103/PhysRevC.107.064902 (publication)

Report number:

CERN-EP-2022-186

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (APS)

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

{}^{208}{Pb}

nuclei at

\sqrt{s_{NN}} = 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

\sqrt{s_{NN}} = 2.76

TeV. In addition, the cross sections for the exclusive emission of one, two, three, four, and five 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, 203}{Pb}

, 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).

Note:

26 pages, 5 captioned figures, 7 tables, authors from page 21, published version, figures at http://alice-publications.web.cern.ch/node/8400

magnet: superconductivity
excited state: energy
nucleus: fragmentation
calorimeter: forward spectrometer
dissociation: electromagnetic
nucleus: density
cross section: measured
heavy ion: scattering
nucleus: excited state
experimental results

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