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The electric dipole strength distribution in Ca-48 between 5 and 25 MeV hasbeen determined at RCNP, Osaka, from proton inelastic scattering experiments atforward angles. Combined with photoabsorption data at higher excitation energy,this enables for the first time the extraction of the electric dipolepolarizability alpha_D(Ca-48) = 2.07(22) fm^3. Remarkably, the dipole responseof Ca-48 is found to be very similar to that of Ca-40, consistent with a smallneutron skin in Ca-48. The experimental results are in good agreement with abinitio calculations based on chiral effective field theory interactions andwith state-of-the-art density-functional calculations, implying a neutron skinin Ca-48 of 0.14 - 0.20 fm.

Electric dipole polarizability of $^{48}$Ca and implications for the neutron skin