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Our group appears in the Labtalk: Journal of Physics G.
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Journal of Physics G: Nuclear and Particle Physics

In-medium effects on the muon-neutrino and anti-muon neutrino scattering off finite nuclei
When and how do we include the in-medium effects in neutrino scattering off target nuclei?
Myung-Ki Cheoun et al 2015 J. Phys. G: Nucl. Part. Phys. 42 045102

Neutrino scattering has become one of the most useful tools for understanding neutrino physics as well as neutrino astrophysics. Most of the data are extracted by neutrino scattering off target nuclei, with incident neutrino energy ranges from a few MeV to tens of GeV. As well known in other systems, we need to understand the target nuclear structure being probed by the weak interaction. Therefore it would be very helpful to know from which energy region we have to include in the structure effect and how to include it in the analysis of the neutrino scattering.

Our calculations compared to the NOMAD data

In this work published in Journal of Physics G: Nuclear and Particle Physics, we report on when and how to include in-medium effects in the target nuclei. In the figure, we show our theoretical total cross sections of neutrino and anti-neutrino scattering off hydrogen and a 12C target compared to the MiniBooNE and NOMAD neutrino data, whose energy ranges are up to about 10 and 1000 GeV, respectively. These results were carried out by the elementary process, i.e. neutrino scattering off a free nucleon, by taking into account the in-medium effect for 12C using the density-dependent form factors estimated by the quark meson coupling (QMC) model.

The effects of the in-medium (the difference between red and black curves in the figure) are small compared to the experimental error bars. In particular, neutrino scattering above 1 GeV can be properly described by the elementary process, irrespective of neutrino types and their current types. But, below the 1 GeV region, it is found that one needs to include nuclear structure as well as the Fermi motion of nucleons for the neutrino scattering.

Soongsil University Nuclear Astrophysics Group