New Properties of High Momentum Distribution of Nucleons in Asymmetric Nuclei
arXiv:1210.3280 · doi:10.1103/PhysRevC.89.034305
Abstract
Based on the recent experimental observations of the dominance of tensor interaction in the ~250-600~MeV/c momentum range of nucleons in nuclei, the existence of two new properties for high-momentum distribution of nucleons in asymmetric nuclei is suggested. The first property is the approximate scaling relation between proton and neutron high-momentum distributions weighted by their relative fractions in the nucleus. The second property is the inverse proportionality of the strength of the high-momentum distribution of protons and neutrons to the same relative fractions. Based on these two properties the high-momentum distribution function for asymmetric nuclei has been modeled and demonstrated that it describes reasonably well the high-momentum characteristics of light nuclei. However, the most surprising result is obtained for neutron rich nuclei with large A, for which a substantial relative abundance of high-momentum protons as compared to neutrons is predicted. For example, the model predicts that in Au the relative fraction of protons with momenta above ~MeV/c is 50% more than that of neutrons. Such a situation may have many implications for different observations in nuclear physics related to the properties of a proton in neutron rich nuclei.
Six pages two tables and one figure, to appear in Physical Review C
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