Study of isovector resonances with pion charge exchange

H. W. Baer, R. Bolton, J. D. Bowman, M. D. Cooper, F. Cverna, N. S.P. King, M. Leitch, H. S. Matis, J. Alster, A. Doron, A. Erell, M. A. Moinester, E. Blackmore, E. R. Siciliano

Research output: Contribution to journalArticlepeer-review


Studies with the pion charge exchange reactions (π±, π0) at 164 MeV using the π0 spectrometer are yielding new results on the existence and systematic features of isovector resonances in nuclei. These experiments possess an unusually high signal/background ratio for isovector resonances of low-multipolarity. Results obtained to date are: (1) Observation and angular distribution measurement of the giant dipole resonances in nuclei 12C, 40Ca, 90Zr and 120Sn; (2) Observation and angular distribution measurements in the (π-, π0) reaction on 90Zr and 120Sn of large signals possessing the expected angular distribution shapes and magnitudes for the isovector monopole resonance. Excitation energies are near the hydrodynamical model values 170 A- 1 3MeV. Differential cross sections are approximately 0.7 J2(qR) mb/sr. An overview of this experimental program, with emphasis on new results, and how they correlate with existing knowledge on the isovector resonances, is given.

Original languageEnglish
Pages (from-to)437-453
Number of pages17
JournalNuclear Physics A
Issue numberC
StatePublished - 21 Mar 1983


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