Electric Dipole Polarizability of Ca-48 and Implications for the Neutron Skin

Birkhan, J.; Miorelli, M.; Bacca, S.; Bassauer, S.; Bertulani, C. A.; Hagen, G.; Matsubara, H.; von Neumann-Cosel, P.; Papenbrock, T.; Pietralla, N.; Ponomarev, V. Yu.; Richter, A.; Schwenk, Achim; Tamii, A.

doi:10.1103/PhysRevLett.118.252501

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Electric Dipole Polarizability of Ca-48 and Implications for the Neutron Skin

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Schwenk, Achim
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Birkhan, J., Miorelli, M., Bacca, S., Bassauer, S., Bertulani, C. A., Hagen, G., et al. (2017). Electric Dipole Polarizability of Ca-48 and Implications for the Neutron Skin. Physical Review Letters, 118(25): 252501. doi:10.1103/PhysRevLett.118.252501.

Cite as: https://hdl.handle.net/21.11116/0000-0001-2DCB-9

Abstract

The electric dipole strength distribution in Ca-48 between 5 and 25 MeV has been determined at RCNP, Osaka from proton inelastic scattering experiments at forward angles. Combined with photoabsorption data at higher excitation energy, this enables the first extraction of the electric dipole polarizability alpha(D) (Ca-48) = 2.07(22) fm(3). Remarkably, the dipole response of Ca-48 is found to be very similar to that of Ca-40, consistent with a small neutron skin in Ca-48. The experimental results are in good agreement with ab initio calculations based on chiral effective field theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in Ca-48 of 0.14-0.20 fm.