= Sudbury Neutrino Observatory
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= SNO
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The SNO Collaboration used $1000$ tonnes of <heavy water> in a $12\,\mathrm m$ acrylic sphere, surrounded by ordinary <water> shielding and $9456$ <photomultipliers>. <Weak charged current> (CC) breakup of a <deuteron> selects <electron neutrinos>; <weak neutral current> (NC) breakup measures all active <neutrino flavors>; <Electron> <elastic scattering> (ES) has reduced non-electron sensitivity.<Measurement of the Rate of νe + d → p + p + e− Interactions Produced by 8B Solar Neutrinos at the Sudbury Neutrino Observatory by Q. R. Ahmad and others>[PDF p. 2: reactions and apparatus]{ref}
$$
\begin{aligned}
\nu_e+d&\longrightarrow p+p+e^-&&\mathrm{CC},\\
\nu_\alpha+d&\longrightarrow p+n+\nu_\alpha&&\mathrm{NC},\\
\nu_\alpha+e^-&\longrightarrow\nu_\alpha+e^-&&\mathrm{ES},\qquad\alpha=e,\mu,\tau.
\end{aligned}
$$
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