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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

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
Volume396
Issue numberC
DOIs
StatePublished - 21 Mar 1983

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