The cross sections of forward emission of one, two and three neutrons by 158A GeV In-115 nuclei in collisions with Al, Cu, Sn and Pb targets are reported. The measurements were performed in the framework of the ALICE-LUMI experiment at the SPS facility at CERN. Various corrections accounting for the absorption of beam nuclei and produced neutrons in target material and surrounding air were introduced. The corrected cross section data are compared with the predictions of the RELDIS model for electromagnetic fragmentation of In-115 in ultraperipheral collisions, as well as with the results of the abrasion ablation model for neutron emission in hadronic interactions. The measured neutron emission cross sections well agree with the RELDIS results, with the exception of In-Al collisions where the measured cross sections are larger compared to RELDIS. This is attributed to a relatively large contribution of hadronic fragmentation of In on Al target with respect to electromagnetic fragmentation, in contrast to similar measurements performed earlier with 30A GeV Pb-208 colliding with Al. (C) 2013 Elsevier B.V. All rights reserved.
Emission of forward neutrons by 158A GeV indium nuclei in collisions with Al, Cu, Sn and Pb
PUDDU, GIOVANNA;Cicalo C.;
2014-01-01
Abstract
The cross sections of forward emission of one, two and three neutrons by 158A GeV In-115 nuclei in collisions with Al, Cu, Sn and Pb targets are reported. The measurements were performed in the framework of the ALICE-LUMI experiment at the SPS facility at CERN. Various corrections accounting for the absorption of beam nuclei and produced neutrons in target material and surrounding air were introduced. The corrected cross section data are compared with the predictions of the RELDIS model for electromagnetic fragmentation of In-115 in ultraperipheral collisions, as well as with the results of the abrasion ablation model for neutron emission in hadronic interactions. The measured neutron emission cross sections well agree with the RELDIS results, with the exception of In-Al collisions where the measured cross sections are larger compared to RELDIS. This is attributed to a relatively large contribution of hadronic fragmentation of In on Al target with respect to electromagnetic fragmentation, in contrast to similar measurements performed earlier with 30A GeV Pb-208 colliding with Al. (C) 2013 Elsevier B.V. All rights reserved.
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