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Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 37: Hadronic Probes IV, Interaction of Pions

HK 37.5: Vortrag

Dienstag, 17. März 1998, 18:45–19:00, C

Systematics of the Low-Energy Pionic Double Charge Exchange and its Bumpy Structure — •J. Pätzold1, R. Bilger1, H. Clement1, A. Denig2, K. Föhl3, J. Gräter1, W. Kluge2, J. Kress1, R. Meier1, M. Schepkin4, U. Siodlaczek1, G.J. Wagner1, R. Abela5, F. Foroughi5, and D. Renker51Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen — 2Univ. Karlsruhe — 3Univ. Edinburgh — 4ITEP Moscow — 5PSI Villigen

The pionic double charge exchange (DCX) reaction on nuclei exhibits at energies below the Δ resonance a systematic resonance-like structure, which has been interpreted as evidence for a resonance in the πNN subsystem [1,2]. By new measurements on 12C and 7Li we have extended our systematic DCX studies to the lightest nuclei, where the observation of the DCX process to discrete final states is still possible. However, the residual nuclei like 12O and 7B are already particle instable and hence a large background from breakup processes has to be considered.
[1] R. Bilger et al., Phys. Rev. Lett. 71 (1993) 42; 72 (1994) 2972
[2] K. Föhl et al., Phys. Rev. Lett. 79 (1997) 3849
supported by BMBF (06 TU 886) and DFG (Mu 705/3, Graduiertenkolleg)

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