Measurement of the Dipole Polarizability of the Unstable Neutron-Rich Nucleus Ni-68

Publication Type
Journal Article
Year of Publication
2013
Authors
Rossi, D. M.
Adrich, P.
Aksouh, F.
Alvarez-Pol, H.
Aumann, T.
Benlliure, J.
Bohmer, M.
Boretzky, K.
Casarejos, E.
Chartier, M.
Chatillon, A.
Cortina-Gil, D.
Pramanik, U. D.
Emling, H.
Ershova, O.
Fernandez-Dominguez, B.
Geissel, H.
Gorska, M.
Heil, M.
Johansson, H. T.
Junghans, A.
Kelic-Heil, A.
Kiselev, O.
Klimkiewicz, A.
Kratz, J. V.
Krucken, R.
Kurz, N.
Labiche, M.
Le Bleis, T.
Lemmon, R.
Litvinov, Y. A.
Mahata, K.
Maierbeck, P.
Movsesyan, A.
Nilsson, T.
Nociforo, C.
Palit, R.
Paschalis, S.
Plag, R.
Reifarth, R.
Savran, D.
Scheit, H.
Simon, H.
Summerer, K.
Wagner, A.
Walus, W.
Weick, H.
Winkler, M.
Name of Publication
Physical Review Lettersv
Volume
111
Issue
24
Date Published
Dec
Short Title
Measurement of the Dipole Polarizability of the Unstable Neutron-Rich Nucleus Ni-68
Accession Number
WOS:000328699400005
ISBN Number
031-9007
Abstract

The E1 strength distribution in Ni-68 has been investigated using Coulomb excitation in inverse kinematics at the (RB)-B-3-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.