#Referral code for neutrino plus series

As a result, interaction simulations are a critical tool in the analysis of neutrino oscillation data. The common use of nuclear targets in neutrino scattering experiments further complicates the problem as secondary hadrons produced in the primary neutrino interaction can be absorbed or lose energy before leaving the target nucleus, obfuscating the details of the primary interaction. Interaction simulations are used to predict the probability of neutrinos of a given flavor and energy to interact with a given target, the observable secondary particle spectra produced in the neutrino–nucleus interaction, and event selection efficiencies and purities. As neutrinos are neutral particles, their properties (including their energy) can only be inferred from observable secondary particles produced when they interact with matter in our particle detectors. The primary goal of atmospheric and long-baseline neutrino-scattering experiments is to study neutrino oscillation, which occurs as a function of neutrino energy and flavor. We do not yet have the resources to migrate to an open source model, but, access to the code and usage instructions are available upon request. Because of the in-house nature of NEUT development and analysis usage, it is not yet open source. The transition region between resonance excitation and deep inelastic scattering has proven particularly difficult to model well. For the multi-GeV samples used in SK analyses, shallow and deep inelastic scattering channels are critical for modelling the expected rate of multi-ring events seen in the detector. It has become clear over the last decade that such interactions can only be precisely predicted by incorporating detailed models of relevant nuclear dynamics.

At T2K energies, charged-current quasi-elastic interactions dominate. Recent development has targeted the improvements most-needed for precise and robust analyses of SK and T2K neutrino oscillation data and neutrino cross-section measurements.

#Referral code for neutrino plus series

NEUT continues to be predominantly developed and maintained by members of the Kamiokande series of experiments (Super-Kamiokande, T2K, Hyper-Kamiokande) and many source files contain comments messages from the numerous physicists who have contributed to the simulation over the past 35 years-including those working on the Nobel prize-winning Super-Kamiokande (SK) analysis .

NEUT has a long rich history, originally developed in the 1980s as a tool to study atmospheric neutrinos and nucleon decay in the Kamiokande experiment , and some of the original FORTRAN77 code is still in use. Finally, NEUT can also simulate various nucleon decay channels to support experimental searches for the process. The NEUT hadron re-scattering model has also been used to simulate low-energy pion–nucleus scattering both to tune the model to the experimental data and to simulate pion propagation in neutrino-scattering experimental simulations. This re-scattering can result in hadron absorption, extra hadron production or knock-out, or distortion of the nuclear-leaving particle kinematic spectra. One of the most important nuclear effects is the re-scattering of hadrons, which are produced in the primary neutrino–nucleon interaction, as they propagate out of the nuclear medium.

Additionally, NEUT incorporates initial and final state nuclear effects for interactions with nuclei from boron to lead. NEUT is capable of simulating neutrino–nucleon and coherent neutrino–nucleus interactions in a number of reaction channels over a neutrino energy range from 100 MeV to a few TeV. NEUT is primarily a neutrino–nucleus scattering simulation program library and provides a complete model capable of predicting the observations for a wide range of neutrino scattering experiments.