diff --git a/include/SimCore/Event/SimParticle.h b/include/SimCore/Event/SimParticle.h
index f014bbd..c23fae9 100644
--- a/include/SimCore/Event/SimParticle.h
+++ b/include/SimCore/Event/SimParticle.h
@@ -27,18 +27,25 @@ class SimParticle {
    */
   enum ProcessType {
     unknown = 0,
-    annihil,
-    compt,
-    conv,
-    electronNuclear,
-    eBrem,
-    eIoni,
-    msc,
-    phot,
-    photonNuclear,
-    GammaToMuPair,
-    eDarkBrem,
-    Decay,
+    annihil = 1,
+    compt = 2,
+    conv = 3,
+    electronNuclear = 4,
+    eBrem = 5,
+    eIoni = 6,
+    msc = 7,
+    phot = 8,
+    photonNuclear = 9,
+    GammaToMuPair = 10,
+    eDarkBrem = 11,
+    Decay = 12,
+    Primary = 13,
+    muonNuclear = 14,
+    neutronInelastic = 15,
+    neutronCapture = 16,
+    kaonInelastic = 17,
+    pionInelastic = 18,
+    protonInelastic = 19,
     // Only add additional processes to the end of this list!
   };
 
diff --git a/src/SimCore/Event/SimParticle.cxx b/src/SimCore/Event/SimParticle.cxx
index 8960659..c0903d4 100644
--- a/src/SimCore/Event/SimParticle.cxx
+++ b/src/SimCore/Event/SimParticle.cxx
@@ -10,6 +10,7 @@ ClassImp(ldmx::SimParticle)
     namespace ldmx {
   SimParticle::ProcessTypeMap SimParticle::createProcessTypeMap() {
     ProcessTypeMap procMap;
+    /// Electromagnetic interactions
     /// e Z --> e Z gamma
     procMap["eBrem"] = ProcessType::eBrem;
     /// gamma --> e+ e-
@@ -26,6 +27,8 @@ ClassImp(ldmx::SimParticle)
     procMap["msc"] = ProcessType::msc;
     /// gamma Z --> Z + X
     procMap["photonNuclear"] = ProcessType::photonNuclear;
+    /// mu Z --> Z + X
+    procMap["muonNuclear"] = ProcessType::muonNuclear;
     /// e Z --> e Z + X
     procMap["electronNuclear"] = ProcessType::electronNuclear;
     /// gamma --> mu+ mu-
@@ -33,6 +36,25 @@ ClassImp(ldmx::SimParticle)
     /// e- Z --> e- Z A'
     procMap["DarkBrem"] = ProcessType::eDarkBrem;
 
+    // Inelastic interactions
+    /// n + Z -> X
+    procMap["neutronInelastic"] = ProcessType::neutronInelastic;
+    /// n + Z -> Z*
+    procMap["neutronCapture"] = ProcessType::neutronCapture;
+    /// K + Z -> X
+    procMap["kaon-Inelastic"] = ProcessType::kaonInelastic;
+    procMap["kaon+Inelastic"] = ProcessType::kaonInelastic;
+    procMap["kaon0LInelastic"] = ProcessType::kaonInelastic;
+    procMap["kaon0SInelastic"] = ProcessType::kaonInelastic;
+    /// pi + Z -> X
+    procMap["pion-Inelastic"] = ProcessType::pionInelastic;
+    procMap["pion+Inelastic"] = ProcessType::pionInelastic;
+    /// p + Z -> X
+    procMap["protonInelastic"] = ProcessType::protonInelastic;
+
+    /// Other
+    /// Primary particle
+    procMap["Primary"] = ProcessType::Primary;
     // Decay
     procMap["Decay"] = ProcessType::Decay;
     return procMap;
diff --git a/src/SimCore/TrackMap.cxx b/src/SimCore/TrackMap.cxx
index 4a834aa..cd25c54 100644
--- a/src/SimCore/TrackMap.cxx
+++ b/src/SimCore/TrackMap.cxx
@@ -70,7 +70,11 @@ void TrackMap::save(const G4Track* track) {
     const G4String& name{process->GetProcessName()};
     particle.setProcessType(ldmx::SimParticle::findProcessType(name));
   } else {
-    particle.setProcessType(ldmx::SimParticle::ProcessType::unknown);
+    if (track->GetParentID() == 0) {
+      particle.setProcessType(ldmx::SimParticle::ProcessType::Primary);
+    } else {
+      particle.setProcessType(ldmx::SimParticle::ProcessType::unknown);
+    }
   }
 
   // track's current kinematics is its end point kinematics