The cross sections of forward emission of one, two and three neutrons by 158A GeV 115In 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 115In 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 208Pb colliding with Al.
Beam nuclei accelerated at the Large Hadron Collider (LHC) at CERN are lost due to interactions with the counter-rotating beam, residual gas, and accelerator elements. Proper modelling of the beam ...transport and radiation load on accelerator components requires reliable prediction of the yields of nuclear fragments produced in electromagnetic dissociation and hadronic fragmentation of beam nuclei. We investigate electromagnetic and hadronic fragmentation of lead nuclei in collisions with various nuclei and single electrons at the injection and collision energies of the LHC. The consideration is based on the RELDIS and abrasion-ablation models. Since this approach well describes Pb fragmentation data at 30 and 158
A
GeV, its validity for Pb nuclei at the LHC collision energy is also expected.
Development of FARICH-detector for ALICE experiment at CERN Berlev, A.I.; Danilyuk, A.F.; Karavicheva, T.L. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2009, 2009-1-00, Letnik:
598, Številka:
1
Journal Article
Recenzirano
In order to extend the momentum range of the charged particle identification up to 10
GeV
/c for pion–kaon separation and to 14
GeV
/c for kaon–proton separation of the ALICE experiment at LHC ...(CERN), the focusing aerogel ring imaging Cherenkov (FARICH) detector employing a multi-layer silica aerogel as radiator has been proposed. The design project of the FARICH Prototype is presented.
Results of the test of the avalanche photo-diodes with metal-resistance-semiconductor structure produced by the Centre of Perspective Technology and Apparatus (CPTA MRS APDs) are shown. Preliminary data of tests of the light-collecting capability for aluminum and stainless steel Winston cone holes of different types are presented.
The performance of the proposed detector was estimated using the GEANT4 simulation. Results of the optimization of characteristics of the aerogel radiators, CPTA MRS APDs with and without wavelength shifter paint are discussed.
The Spin Studies in Few-Body Systems at Nuclotron Ladygin, V. P; Dobrin, I; Fimushkin, V. V ...
International Journal of Modern Physics: Conference Series,
2016, Letnik:
40
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
Recent results on spin effects in few nucleon systems obtained at Nuclotron-JINR are presented. The data on the deuteron analyzing powers in different reactions in the wide energy range demonstrate ...the sensitivity to the short-range spin structure of the light nuclei. The future plans on the studies with polarized deuterons from new polarized ion source at Nuclotron will be reported.
The cross sections of forward emission of one, two and three neutrons by 158A GeV 115In 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 115In 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, on the contrary to similar measurements performed earlier with 30A GeV 208Pb colliding with Al.
The contributions of the two ALICE forward detectors, V0 and T0, to the luminosity and multiplicity study, and beam diagnostics are discussed. Already the runs during the LHC commissioning period ...should provide sufficient data for luminosity and multiplicity determination and for establishing the position of the interaction point along longitudinal and transverse axis. Precise determination of the relative luminosity and its monitoring is required as it enters to the cross section calculations of all physics processes. The goal is to keep the systematic error of the relative luminosity in ALICE within 5 %.
New measurement of the energy dependence of pion production on a copper target near 350-MeV proton energy has been performed. The E-170 experiment has been carried out at the Ring Cyclotron Facility ...of the Research Center for Nuclear Physics, Osaka University, Japan. A small enhancement of the low-energy pion production cross section was observed near the incident proton energy of 352 MeV.
New measurement of the energy dependence of pion production on a copper target near 350-MeV proton energy has been performed. The E-170 experiment has been carried out at the Ring Cyclotron Facility ...of the Research Center for Nuclear Physics, Osaka University, Japan. A small enhancement of the low-energy pion production cross section was observed near the incident proton energy of 352 MeV.
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