Description
In neutrino oscillation experiments such as T2K experiment and supernova relic neutrino searches, the uncertainty of neutrino interactions is a dominant source of systematic errors.
This uncertainty is mainly due to the complex many-body nuclear effect. To reduce the uncertainty, it is necessary to measure not only charged leptons but also hadrons, especially nucleons, which are difficult to measure with many detectors currently in use. While protons can be measured by a tracker with good vertex resolution, neutrons are still challenging to measure because they do not leave a clear track.
In this study, we focus on neutron measurement. Using a large liquid scintillator KamLAND with high neutron detection efficiency, we aim to reduce the model uncertainty by measuring atmospheric neutrinos and J-PARC neutrino beams and the associated neutrons. The KamLAND Collaboration is currently working on the calibration of detector and MC for the high energy region and the prediction of nuclear de-excitation. In this poster, we will mainly focus on nuclear de-excitation.
Residual nuclei from neutrino interactions often have excitation energies of about 20 MeV and undergo de-excitation. This process emits not only gamma rays but also a variety of particles, including neutrons. Therefore, the prediction of neutron emission due to this de-excitation is important in this study. We used two software packages, TALYS and Geant4, to predict the complex de-excitation process. By combining these results with the output of the neutrino event generators, we make a comprehensive prediction of neutrino interactions.
| Collaboration | KamLAND Collaboration |
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