A. Krasznahorkay, L. Stuhl, M. Csatlós, A. Algora, J. Gulyás, J. Timár, N. Paar, D. Vretenar, K. Boretzky, M. Heil, Yu. A. Litvinov, D. Rossi, C. Scheidenberger, H. Simon, H. Weick, A. Bracco, S. Brambilla, N. Blasi, F. Camera, A. Giaz, B. Million, L. Pellegri, S. Riboldi, O. Wieland, S. Altstadt, M. Fonseca, J. Glorius, K. Göbel, T. Heftrich, A. Koloczek, S. Kräckmann, C. Langer, R. Plag, M. Pohl, G. Rastrepina, R. Reifarth, S. Schmidt, K. Sonnabend, M. Weigand, M. N. Harakeh, N. Kalantar-Nayestanaki, C. Rigollet, S. Bagchi, M. A. Najafi, T. Aumann, L. Atar, M. Heine, M. Holl, A. Movsesyan, P. Schrock, V. Volkov, F. Wamers, E. Fiori, B. Löher, J. Marganiec, D. Savaran, H. T. Johansson, P. Diaz Fernández, U. Garg, D. L. Balabanski
The gamma-decay of the anti-analog of the giant dipole resonance (AGDR) has been measured to the isobaric analog state excited in the p(124Sn,n) reaction at a beam energy of 600 MeV/nucleon. The energy of the transition was also calculated with state-of-the-art self-consistent random-phase approximation (RPA) and turned out to be very sensitive to the neutron-skin thickness (\DeltaR_(pn)). By comparing the theoretical results with the measured one, the \DeltaR_(pn) value for 124Sn was deduced to be 0.18 \pm 0.02 fm, which agrees well with the previous results. The energy of the AGDR measured previously for ^(208)Pb was also used to determine the \DeltaR_(pn) for ^(208)Pb. In this way a very precise \DeltaR_(pn) = 0.18 \pm 0.02 neutron-skin thickness has been obtained for 208Pb. The present method offers new possibilities for measuring the neutron-skin thicknesses of very exotic isotopes.
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http://arxiv.org/abs/1205.2325
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