diff --git a/Inputs/EventGenerator/10He.reaction b/Inputs/EventGenerator/10He.reaction
index 1987df73649f40bdf632faad34251b0c2a9d64b3..8567e32e3e2aad009e6f1f14e403149c23216e86 100644
--- a/Inputs/EventGenerator/10He.reaction
+++ b/Inputs/EventGenerator/10He.reaction
@@ -19,7 +19,7 @@ TransfertToResonance
 	ResonanceDecayA= 8
 	CrossSectionPath= 11Li(d,3He)10He.txt	
 	ShootLight= 1
-	ShootHeavy= 0
+	ShootHeavy= 1
 	ShootDecayProduct= 0
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
diff --git a/NPSimulation/src/EventGeneratorTransfert.cc b/NPSimulation/src/EventGeneratorTransfert.cc
index 98cf44b25ad8ec2fac8977cebda7751989d56747..d4bb00cc459f78c8b1e4cb2726bc3cc529202095 100644
--- a/NPSimulation/src/EventGeneratorTransfert.cc
+++ b/NPSimulation/src/EventGeneratorTransfert.cc
@@ -450,8 +450,8 @@ void EventGeneratorTransfert::GenerateEvent(G4Event* anEvent , G4ParticleGun* pa
                                          sin(ThetaLight) * sin(phi),
                                          cos(ThetaLight));
    // Momentum in beam frame for heavy particle
-   G4ThreeVector momentum_kineHeavy_beam(sin(ThetaHeavy) * cos(phi),
-                                         sin(ThetaHeavy) * sin(phi),
+   G4ThreeVector momentum_kineHeavy_beam(sin(ThetaHeavy) * cos(phi+pi),
+                                         sin(ThetaHeavy) * sin(phi+pi),
                                          cos(ThetaHeavy));
 
    // write angles/energy to ROOT file
diff --git a/NPSimulation/src/EventGeneratorTransfertToResonance.cc b/NPSimulation/src/EventGeneratorTransfertToResonance.cc
index 270f2eadae742b4d751c5211cbee822406692ce2..dab91dec0c35eed7f27f43f8df34e9893adca48a 100644
--- a/NPSimulation/src/EventGeneratorTransfertToResonance.cc
+++ b/NPSimulation/src/EventGeneratorTransfertToResonance.cc
@@ -510,8 +510,8 @@ void EventGeneratorTransfertToResonance::GenerateEvent(G4Event* anEvent , G4Part
                                          sin(ThetaLight) * sin(phi),
                                          cos(ThetaLight));
    // Momentum in beam frame for heavy particle
-   G4ThreeVector momentum_kineHeavy_beam(sin(ThetaHeavy) * cos(phi),
-                                         sin(ThetaHeavy) * sin(phi),
+   G4ThreeVector momentum_kineHeavy_beam(sin(ThetaHeavy) * cos(phi+pi),
+                                         sin(ThetaHeavy) * sin(phi+pi),
                                          cos(ThetaHeavy));
 
    //////////////////////////////////////////////////