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  • Rossi, D., et al. (author)
  • Measurement of the dipole polarizability of the unstable neutron-rich nucleus Ni68
  • 2013
  • In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 111:24
  • Journal article (peer-reviewed)abstract
    • The E1 strength distribution in Ni68 has been investigated using Coulomb excitation in inverse kinematics at the RB3-LAND setup and by measuring the invariant mass in the one- and two-neutron decay channels. The giant dipole resonance and a low-lying peak (pygmy dipole resonance) have been observed at 17.1(2) and 9.55(17) MeV, respectively. The measured dipole polarizability is compared to relativistic random phase approximation calculations yielding a neutron-skin thickness of 0.17(2) fm. A method and analysis applicable to neutron-rich nuclei has been developed, allowing for a precise determination of neutron skins in nuclei as a function of neutron excess.
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