Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-04-04
Phys.Rev.Lett. 97 (2006) 162504
Physics
Nuclear Physics
Nuclear Theory
4 pages and 3 figures, Revised version to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.97.162504
We analyze recent data from high-momentum-transfer $(p,pp)$ and $(p,ppn)$ reactions on Carbon. For this analysis, the two-nucleon short-range correlation (NN-SRC) model for backward nucleon emission is extended to include the motion of the NN-pair in the mean field. The model is found to describe major characteristics of the data. Our analysis demonstrates that the removal of a proton from the nucleus with initial momentum 275-550 MeV/c is $92^{+8}_{-18}%$ of the time accompanied by the emission of a correlated neutron that carries momentum roughly equal and opposite to the initial proton momentum. Within the NN-SRC dominance assumption the data indicate that the probabilities of $pp$ or $nn$ SRCs in the nucleus are at least a factor of six smaller than that of $pn$ SRCs. Our result is the first estimate of the isospin structure of NN-SRCs in nuclei, and may have important implication for modeling the equation of state of asymmetric nuclear matter.
Frankfurt Leonid L.
Piasetzky Eli
Sargsian Misak M.
Strikman Mark
Watson J. W.
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