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A generator of forward neutrons for ultra-peripheral collisions: nOOn
Computer Physics Communications ( IF 3.309 ) Pub Date : 2020-01-24 , DOI: 10.1016/j.cpc.2020.107181
M. Broz; J.G. Contreras; J.D. Tapia Takaki

The study of photon-induced reactions in collisions of heavy nuclei at RHIC and the LHC has become an important direction of the research program of these facilities in recent years. In particular, the production of vector mesons in ultra-peripheral collisions (UPC) has been intensively studied. Owing to the intense photon fluxes, the two nuclei participating in such processes undergo electromagnetic dissociation producing neutrons at beam rapidities. Here, we introduce the nOOn (pronounced noon) Monte Carlo program, which generates events containing such neutrons. nOOn is a ROOT based program that can be interfaced with existing generators of vector meson production in UPC or with theoretical calculations of such photonuclear processes. nOOn can also be easily integrated with the simulation programs of the experiments at RHIC and the LHC. Program summary Program Title: nOOn Program Files doi: http://dx.doi.org/10.17632/jynt6cvhjk.1 Licencing provisions: GNU GPLv3 Programming language: C++ External routines: The generator is based on ROOT. Nature of problem: The electromagnetic fields of nuclei at RHIC and the LHC can be described as a flux of quasi-real photons. These photons may interact with one of the nucleus in the opposite beam. There are events of interest where two independent interactions occur, one involving a hard scattering and one from the exchange of soft photons. As a result of the latter, the nucleus get excited and upon de-excitation it may emit neutrons, which are boosted to beam rapidities. The program computes the probability of neutron emission based on existing measurements and some mild modelling; it then generates neutrons in a per-event basis. Solution method: The break-up probabilities are computed using existing data and stored in ROOT objects (graphs and histograms). Photon energies from the accompanying hard process, e.g. vector meson production, are loaded into the program and a catalogue of specific break-up probabilities is constructed. The number of neutrons emitted in the event is generated and the neutrons are produced and boosted into the laboratory frame. The output is a TTree with a TClonesArray of TParticles per event, which can be easily interfaced to the simulation programs of the RHIC and LHC collaborations. Restrictions: At the moment only emission from Pb is available. References: https://github.com/mbroz84/noon
更新日期:2020-01-24

 

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