Measurement of the Dipole Polarizability of the Unstable Neutron-Rich Nucleus Ni68

D. M. Rossi et al.
Phys. Rev. Lett. 111, 242503 – Published 10 December 2013

Abstract

The E1 strength distribution in Ni68 has been investigated using Coulomb excitation in inverse kinematics at the RB3LAND 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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  • Received 12 September 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.242503

© 2013 American Physical Society

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Vol. 111, Iss. 24 — 13 December 2013

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