[en] The general features of pion charge-exchange reactions leading to nuclear-isobaric-analog states (IAS) and double-isobaric-analog states (DIAS), as they have emerged from studies over the past ten years, are reviewed. The energy range investigated is 20 to 550 MeV for IAS transitions and 20 to 300 MeV for DIAS transitions. These data are seen to play an important role in characterizing the pion optical potential, in determining the Δ-N interaction in nuclei, and in the study of nucleon correlations in nuclei. Recent progress achieved in understanding the role of such correlations in double-charge-exchange reactions is reviewed. 55 refs., 43 figs., 3 tabs

[en] A review is given of pion single- and double-charge exchange reactions at incident energies of 25 to 65 MeV leading to isobaric analog states, and in the case of double-charge exchange leading to the ground state of the residual nucleus. The crucial role of the higher nuclear transparency at low pion energies for the analysis of the data in terms of single and double scattering is demonstrated. The large effects on double-charge exchange produced by the spatial correlations in nuclear wave functions are evident. The data on 1f_7/2 nuclei at 35 MeV are used to establish the general validity of a shell-model-based two-amplitude model for these transitions. Recent measurements of the energy dependence between 25 and 65 MeV of double-charge exchange cross sections at forward angles are presented and discussed. 33 refs., 19 figs

[en] A review is given of pion double-charge exchange reactions at incident energies of 25 to 65 MeV and leading to nuclear isobaric- analog states and to ground states. The large effects on the cross-section magnitudes and angular distribution shapes produced by spatial correlations in nuclear wave functions are demonstrated. The data on 1f7/2 nuclei at 35 MeV obtained in the last few years are used to establish the general validity of the two-amplitude shell model description for these transitions. Recent measurements on the energy dependence between 20 and 65 MeV of forward-angle cross sections are presented and discussed. 19 refs., 15 figs., 2 tabs

[en] Data and calculations for the ⁴⁰Ca(π+-,π⁰) reactions at 164 MeV are shown which indicate that pion scattering possesses a unique signature for separately identifying the 1^- and 2^- spin-isospin components of the giant dipole resonance

[en] Recent results on giant resonances obtained with pion-inelastic scattering and with single- and double-charge-exchange scattering are reviewed. The states discussed are isobaric analog states, double-isobaric analog states, and isovector L = 0, 1, and 2 collective states. 36 references

[en] A review is given of pion double-charge reactions at incident energies of 30 to 65 MeV and leading to isobaric-analog states. The large effects on cross section magnitudes and angular-distribution shapes produced by two-nucleon correlations are discussed. New results on 1 f/sub 7/2/ shell nuclei are compared to predictions of a shell-model-based two-amplitude model. 19 refs., 15 figs., 2 tabs

[en] The general features of pion charge-exchange reactions at energies of 20 to 80 MeV leading to nuclear isobaric-analog states (IAS) and double-isobaric-analog states (DIAS) are reviewed. The recent progress achieved in understanding the role of short-range N-N correlations in the double-charge-exchange reactions is presented. 36 refs., 21 figs., 2 tabs

No abstract available

[en] Experimental and theoretical aspects of double-analog, nonanalog, and continuum pion double charge exchange in the 50- to 310-MeV energy range are covered. Separate abstracts were prepared for 22 papers in these proceedings

[en] Studies with the pion charge exchange reactions (π^+-,π⁰) at 164 MeV using the LAMPF 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 disribution measurement of the giant dipole resonance in nuclei ¹²C, ⁴⁰Ca, ⁹⁰Zr, and ¹²⁰Sn; and (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^-13/ MeV. Differential cross sections are approximately 0.7 J₁²(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 presented