Abstract
In this paper, we study deuteron breakup by high energy neutrinos. We present previously unpublished data on neutrino induced backward protons from deuteron targets; we calculate the contributions from both the two-nucleon $(2N)$ and six-quark $(6q)$ deuteron components, which depend upon the overall normalization of the part that is $6q;$ and, we suggest other signatures for distinguishing the $2N$ and $6q$ clusters. We conclude that the $6q$ cluster naturally contributes to the high momentum backward proton spectrum just in the region where the standard $2N$ models lie below the data, and the absolute size of the far backward data is nicely explained if the amount of $6q$ is one or a few percent by normalization of the deuteron.
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