In pion double charge exchange （DCX）, the existence of large non-analog cross section for （π+, π-） reaction on T=0 nuclei is a noticeable phenomenon. At 164 MeV, the cross section for 16O （T=0） is nearly as la...In pion double charge exchange （DCX）, the existence of large non-analog cross section for （π+, π-） reaction on T=0 nuclei is a noticeable phenomenon. At 164 MeV, the cross section for 16O （T=0） is nearly as large as that for 18O （T=1）. For instance, the ratio σ(18O)/σ(16O) is 3: 1 at 164 MeV, but at 292 MeV, it rapidly becomes 20:1. That means the ratios are strongly energy-dependent. The anomalous features observed in the展开更多
文摘In pion double charge exchange （DCX）, the existence of large non-analog cross section for （π+, π-） reaction on T=0 nuclei is a noticeable phenomenon. At 164 MeV, the cross section for 16O （T=0） is nearly as large as that for 18O （T=1）. For instance, the ratio σ(18O)/σ(16O) is 3: 1 at 164 MeV, but at 292 MeV, it rapidly becomes 20:1. That means the ratios are strongly energy-dependent. The anomalous features observed in the
