Abstract
Measurements of particle emission from a replica of the T2K 90 cm-long carbon target were performed in the NA61/SHINE experiment at CERN SPS, using data collected during a high-statistics run in 2009. An efficient use of the long-target measurements for neutrino flux predictions in T2K requires dedicated reconstruction and analysis techniques. Fully-corrected differential yields of $\pi^\pm$-mesons from the surface of the T2K replica target for incoming 31 GeV/c protons are presented. A possible strategy to implement these results into the T2K neutrino beam predictions is discussed and the propagation of the uncertainties of these results to the final neutrino flux is performed.
Highlights
T2K neutrino beamsThe T2K neutrino beam is generated at the J-PARC complex by 30 GeV protons impinging on a target which is a 90 cm long graphite rod
Measurements of particle emission from a replica of the T2K 90 cm-long carbon target were performed in the NA61/SHINE experiment at CERN SPS, using data collected during a high-statistics run in 2009
Intrinsic uncertainties on the fluxes predicted with Monte Carlo (MC) simulations arise from the models employed to simulate hadron emission from long nuclear targets used in accelerator-based experiments
Summary
The T2K neutrino beam is generated at the J-PARC complex by 30 GeV protons impinging on a target which is a 90 cm long graphite rod. The primary proton beam is monitored by a set of detectors which allows to precisely measure the characteristics of the beam. By choosing the polarity of the horn currents, it is possible to create either an enhanced neutrino beam or an enhanced antineutrino beam. The neutrino beam predictions are based on a detailed Monte-Carlo simulation. The FLUKA2011 [17,18,19] model is used to simulate the interactions of beam protons with the long graphite target. The propagation of the particles emerging from the surface of the target is modeled by a GEANT3 [20] simulation using GCALOR [21] as hadronic model for reinteractions in the detector.
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