Giant dipole resonances built on isobaric analog states in pion double charge exchange

S. Mordechai*, N. Auerbach, G. R. Burleson, K. S. Dhuga, M. Dwyer, J. A. Faucett, H. T. Fortune, R. Gilman, S. J. Greene, C. Laymon, C. Fred Moore, C. L. Morris, D. S. Oakley, M. A. Plum, S. J. Seestrom-Morris, Peter A. Seidl, M. J. Smithson, Z. F. Wang, J. D. Zumbro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Giant resonances were observed in (+,-) double charge exchange (at T=292 MeV) on Fe56, Se80, and Pb208 at excitation energies of 28.5, 34.6, and 43.6 MeV, respectively. An angular distribution for Fe56 was measured and observed to have a dipole shape. The variation of excitation energy above the double isobaric analog state is consistent with an A-1/3 dependence, as expected for giant dipole resonances built on the isobaric analog states. The Fe56 angular distribution agrees well with a coupled-channels impulse-approximation calculation in which sequential single charge exchange through the isobaric analog to the giant dipole resonance is evaluated.

Original languageEnglish
Pages (from-to)408-411
Number of pages4
JournalPhysical Review Letters
Volume60
Issue number5
DOIs
StatePublished - 1988
Externally publishedYes

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