Double giant dipole resonance in the (π,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. O’Donnell, and N. Auerbach
Phys. Rev. C 45, 2723 – Published 1 June 1992
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Abstract

The double isovector giant dipole state has been observed in the (π,π+Tx=+2 double-charge-exchange reaction on C13, Al27, Ca40, Fe56, Co59, and Nb93. The resonances observed in the (π,π+) reaction are closely related via Coulomb displacement energy and isospin symmetry to the resonances measured in the inverse (π+,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+,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.

  • Received 5 March 1992

DOI:https://doi.org/10.1103/PhysRevC.45.2723

©1992 American Physical Society

Authors & Affiliations

H. Ward, K. Johnson, G. Kahrimanis, D. Saunders, and C. Fred Moore

  • University of Texas at Austin, Austin, Texas 78712

S. Mordechai

  • Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
  • University of Texas at Austin, Austin, Texas 78712

C. L. Morris

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

H. T. Fortune, M. A. Kagarlis, D. A. Smith, and J. M. O’Donnell

  • University of Pennsylvania, Philadelphia, Pennsylvania 19104

N. Auerbach

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545
  • University of Pennsylvania, Philadelphia, Pennsylvania 19104

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Issue

Vol. 45, Iss. 6 — June 1992

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