Neutron-skin thickness from the study of the anti-analog giant dipole resonance

A. Krasznahorkay , L. Stuhl , M. Csatl\'os , A. Algora , J. Guly\'as , J. Tim\'ar , N. Paar , D. Vretenar

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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. G\"obel T. Heftrich A. Koloczek S. Kr\"ackmann 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. L\"oher J. Marganiec D. Savran H.T. Johansson P. Diaz Fern\'andez U. Garg D.L. Balabanski

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keywords deltarneutron-skinenergymeasuredthicknessveryagdranti-analog

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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 0.175 \pm 0.048 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) = 0.181 \pm 0.031 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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Neutron-skin thickness from the study of the anti-analog giant dipole resonance

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