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. 2013 Dec 13;111(24):242503.
doi: 10.1103/PhysRevLett.111.242503. Epub 2013 Dec 10.

Measurement of the dipole polarizability of the unstable neutron-rich nucleus 68Ni

D M Rossi  1 , P Adrich  2 , F Aksouh  2 , H Alvarez-Pol  3 , T Aumann  4 , J Benlliure  3 , M Böhmer  5 , K Boretzky  2 , E Casarejos  6 , M Chartier  7 , A Chatillon  2 , D Cortina-Gil  3 , U Datta Pramanik  8 , H Emling  2 , O Ershova  9 , B Fernandez-Dominguez  10 , H Geissel  2 , M Gorska  2 , M Heil  2 , H T Johansson  11 , A Junghans  12 , A Kelic-Heil  2 , O Kiselev  1 , A Klimkiewicz  13 , J V Kratz  14 , R Krücken  5 , N Kurz  2 , M Labiche  15 , T Le Bleis  16 , R Lemmon  17 , Yu A Litvinov  2 , K Mahata  18 , P Maierbeck  5 , A Movsesyan  19 , T Nilsson  20 , C Nociforo  2 , R Palit  21 , S Paschalis  22 , R Plag  23 , R Reifarth  23 , D Savran  24 , H Scheit  19 , H Simon  2 , K Sümmerer  2 , A Wagner  12 , W Waluś  25 , H Weick  2 , M Winkler  2
Affiliations

Measurement of the dipole polarizability of the unstable neutron-rich nucleus 68Ni

D M Rossi et al. Phys Rev Lett. .

Abstract

The E1 strength distribution in 68Ni has been investigated using Coulomb excitation in inverse kinematics at the R3B-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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