Energy dependence of the He-4(pi+,pi-) total cross section.

The CHAOS collaboration Grater, J. ; Bilger, R. ; Clement, H. ; et al.
Phys.Rev.C 58 (1998) 1576-1586, 1998.
Inspire Record 480114 DOI 10.17182/hepdata.25690

The total cross section of the 4He(π+,π−) reaction was measured for π+ kinetic energies ranging from 70 to 130 MeV using the CHAOS spectrometer at TRIUMF and a liquid 4He target. Around Tπ=90MeV, total cross sections exceed conventional model predictions by a factor of 3, whereas at Tπ=70MeV and for Tπ>130MeV the data are consistent with these calculations. An attempt is made to understand this behavior by assuming the production of the hypothetical d′ dibaryon.

1 data table

Double charge exchange reaction. section.