add NC and CC configuration of neutrino interaction

corsika/detail/modules/pythia8/NeutrinoInteraction.inl

@@ -38,11 +38,17 @@ namespace corsika::pythia8 {
                      targetId, projectileP4.getTimeLikeComponent() / 1_GeV);
     CORSIKA_LOG_INFO("configure Pythia for primary neutrino interactions. NC={}, CC={}",
                      handle_nc_, handle_cc_);
+    if (!handle_nc_ && !handle_cc_) {
+      CORSIKA_LOG_ERROR(
+          "no neutrino interaction channel configured! Select either NC, CC or both!");
+      throw std::runtime_error("Configuration error!");
+    }
     CORSIKA_LOG_INFO("minimal Q2 in DIS: {} GeV2", minQ2_ / 1_GeV / 1_GeV);
 
-    if (!isValid(projectileId, targetId, projectileP4, targetP4))
+    if (!isValid(projectileId, targetId, projectileP4, targetP4)) {
+      CORSIKA_LOG_ERROR("wrong projectile, target or energy configuration!");
       throw std::runtime_error("Configuration error!");
-
+    }
     // sample nucleon from nucleus A,Z
     double const fProtons = get_nucleus_Z(targetId) / double(get_nucleus_A(targetId));
     double const fNeutrons = 1. - fProtons;
@@ -71,9 +77,9 @@ namespace corsika::pythia8 {
 
     // Set up DIS process within some phase space.
     // Neutral current (with gamma/Z interference).
-    pythiaMain_.readString("WeakBosonExchange:ff2ff(t:gmZ) = on");
+    if (handle_nc_) pythiaMain_.readString("WeakBosonExchange:ff2ff(t:gmZ) = on");
     // Uncomment to allow charged current.
-    pythiaMain_.readString("WeakBosonExchange:ff2ff(t:W) = on");
+    if (handle_cc_) pythiaMain_.readString("WeakBosonExchange:ff2ff(t:W) = on");
     // Phase-space cut: minimal Q2 of process.
     pythiaMain_.settings.parm("PhaseSpace:Q2Min", Q2min);