Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-02-19
Physics
Nuclear Physics
Nuclear Theory
Revised version, 4 pages, 2 figures and 1 table
Scientific paper
Based on recent progress in understanding the nature of two-nucleon(2N) short range correlations (SRCs) we performed world data analysis on inclusive electro-nuclear reactions at large momentum transfer to extract the probabilities of 2N SRCs for 3He, 4He, 12C, 27Al, 56Fe and 197Au nuclei. Using recent observations on strong dominance of proton-neutron SRCs as compared to proton-proton and neutron-neutron correlations we parameterized the obtained probabilities as a function of nuclear density and asymmetry. With the obtained functional form of the probabilities we estimated the fractions of the off-Fermi shell protons and neutrons in the superdense nuclear matter relevant to neutron stars. Our results indicate that starting at 3 nuclear saturation densities the protons with fractional densities x_p= 1/9 will populate mostly the high momentum (off-Fermi shell) tail of the momentum distribution while only 5% of the neutrons will be in the high momentum tail. We discuss the implication of our observation on several properties of neutron star cores, such as stiffness, phase transitions, cooling, superfluidity and magnetization.
McGauley Michael
Sargsian Misak M.
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