The γ-decay of the anti-analog of the giant dipole resonance (AGDR) to the isobaric analog state has been measured following 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 relativistic random-phase approximation (RPA) and turned out to be very sensitive to the neutronskin thickness (ΔRpn). By comparing the theoretical results with the measured one, the ΔRpn value for 124Sn was deduced to be 0.21 ± 0.07 fm, which agrees well with the previous results. The present method offers new possibilities for measuring the neutron-skin thicknesses of very exotic isotopes.
Neutron-skin thickness from the study of the anti-analog giant dipole resonance / A. Krasznahorkay, L. Stuhl, M. Csatlós, A. Algora, J. Gulyás, J. Timár, N. Paar, D. Vretenar, M.N. Harakeh, K. Boretzky, M. Heil, Y.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, 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. Savran, H.T. Johansson, P..D. Fernández, U. Garg, D.L. Balabanski - In: AIP Conference Proceedings / [a cura di] T. Niksic; M. Milin; D. Vretenar; S. Szilner. - [s.l] : AIP, 2012. - ISBN 9780735411036. - pp. 190-197 (( Intervento presentato al 2. convegno International Conference on Nuclear Structure and Dynamics 2012 tenutosi a Opatija nel 2012.
Neutron-skin thickness from the study of the anti-analog giant dipole resonance
A. Bracco;F. Camera;A. Giaz;L. Pellegri;S. Riboldi;
2012
Abstract
The γ-decay of the anti-analog of the giant dipole resonance (AGDR) to the isobaric analog state has been measured following 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 relativistic random-phase approximation (RPA) and turned out to be very sensitive to the neutronskin thickness (ΔRpn). By comparing the theoretical results with the measured one, the ΔRpn value for 124Sn was deduced to be 0.21 ± 0.07 fm, which agrees well with the previous results. The present method offers new possibilities for measuring the neutron-skin thicknesses of very exotic isotopes.
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