Double giant dipole resonance in the (π-+) reaction

H. Ward, K. Johnson, G. Kahrimanis, D. Saunders, C. Fred Moore, S. Mordechai, C. L. Morris, H. T. Fortune, M. A. Kagarlis, D. A. Smith, J. M. ODonnell, N. Auerbach

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Abstract

The double isovector giant dipole state has been observed in the (π+)ΔTx=+2 double-charge-exchange reaction on 13C, 27Al, 40Ca, 56Fe, 59Co, and 93Nb. The resonances observed in the (π+) reaction are closely related via Coulomb displacement energy and isospin symmetry to the resonances measured in the inverse (π+-) reaction on the same nuclei. The new observations provide a direct determination of the upper isospin component of the double giant dipole state, which is generally very weak in the (π+-) reaction. The comparison between the double dipole in the two double-charge-exchange modes gives valuable information on the isospin splitting and the Pauli-blocking effects for isotensor transitions.

Original languageEnglish
Pages (from-to)2723-2732
Number of pages10
JournalPhysical Review C - Nuclear Physics
Volume45
Issue number6
DOIs
StatePublished - 1 Jan 1992

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