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Neutron density distributions from antiprotonic 208Pb and 209Bi atoms
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The X-ray cascade from antiprotonic atoms was studied for 208Pb and 209Bi. Widths and shifts of the levels due to the strong interaction were determined. Using modern antiproton-nucleus optical potentials the neutron densities in the nuclear periphery were deduced. Assuming two parameter Fermi distributions (2pF) describing the proton and neutron densities the neutron rms radii were deduced for both nuclei. The difference of neutron and proton rms radii /\r_np equal to 0.16 +-(0.02)_{stat} +- (0.04)_{syst} fm for 208Pb and 0.14 +- (0.04)_{stat} +- (0.04)_{syst} fm for 209Bi were determined and the assigned systematic errors are discussed. The /\r_np values and the deduced shapes of the neutron distributions are compared with mean field model calculations.
Forward citations
Cited by 2 Pith papers
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Resolution-matched nuclear geometry and the nucleon-size ambiguity in relativistic heavy-ion collisions
The strong nucleon-width dependence of the Pb+Pb hadronic cross section is a geometric-inflation artifact; with the folded density fixed, σ_AA is width-insensitive and can constrain the 208Pb neutron skin to Δr_np ∈ [...
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Investigating the possibility of extracting neutron-skin thickness in nuclei by their collisions at intermediate energies
In simulated intermediate-energy tin collisions, the free neutron-to-proton yield ratio is more sensitive to the symmetry potential than to the initial neutron-skin thickness in most kinematics.
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