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27 April 2024

» arxiv » 1205.2325

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Neutron-skin thickness from the study of the antianalog giant dipole resonance
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 ;
Date:	10 May 2012
Abstract:	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.
Source:	arXiv, 1205.2325
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