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The CLAS collaboration at Jefferson Laboratory has compared nuclear partondistributions for a range of nuclear targets and found that the EMC effectmeasured in deep inelastic lepton-nucleus scattering has a strongly "isophobic"nature. This surprising observation suggests short-range correlations betweenneighboring $n$ and $p$ nucleons in nuclear wavefunctions that are muchstronger compared to $p-p$ or $n-n$ correlations. In this paper we propose adefinitive experimental test of the nucleon-nucleon explanation of theisophobic nature of the EMC effect: the diffractive dissociation on a nucleartarget $A$ of high energy $\rm ^4He$ nuclei to pairs of nucleons $n$ and $p$with high relative transverse momentum, $\alpha + A \to n + p + A' + X $. Thecomparison of $n-p$ events with $p-p$ and $n-n$ events directly tests thepostulated breaking of isospin symmetry. The experiment also tests alternativeQCD-level explanations for the isophobic EMC effect. In particular it will testa proposal for hidden-color degrees of freedom in nuclear wavefunctions basedon isospin-zero $[ud]$ diquarks.

Diffractive Dissociation of Alpha Particles as a Test of Isophobic Short-Range Correlations inside Nuclei