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Experimental Opportunities for Measuring Neutrino Nucleon Scattering with H$_2$/D$_2$ Detectors

Speaker(s) / Presenter(s):
Thomas Junk (FNAL)


Many models of neutrino-nucleus scattering are guided by data taken during the 1970's and 1980's by the Argonne, Brookhaven, and Fermilab bubble-chamber experiments, which have limited data sample sizes and large systematic uncertainties.  The long-baseline neutrino facility (LBNF) will provide a neutrino beam, primarily composed of $\nu_\mu$ when it runs with forward horn current, and $\bar\nu_\mu$ when it runs with reverse horn current.  The beam intensity is driven by the power of the proton beam on the target, which is slated to start at 1.2 MW and will be upgraded to 2.4 MW.  The near detectors currently being designed are optimized for DUNE's determination of the neutrino mass ordering and the measurement of $\delta_{\rm{CP}}$.  This powerful beam provides unprecedented opportunities to measure the cross sections of neutrinos on protons and neutrons via hydrogen/deuterium targets with integrated particle detection capability.  Options range from using the hydrogen in the scintillating plastic in the SAND near detector component, to adding hydrogen-rich gas to the high-pressure gas TPC near detector component, to building a H$_2$/D$_2$ bubble chamber in a separate hall upstream of the DUNE near detector hall. Polarized targets are also under consideration, though these will necessarily involve other elements along with the hydrogen and deuterium, but they will allow the first measurements of neutrino scattering on polarized nuclei.

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