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HK: Hadronen und Kerne
HK 37: Hadronic Probes IV, Interaction of Pions
HK 37.5: Talk
Tuesday, March 17, 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. Renker5 — 1Physikalisches 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)