From 696b6e20293eccfc31d16fbb04c53e8d329b7772 Mon Sep 17 00:00:00 2001
From: Krishan Mistry <kvjmistry@gmail.com>
Date: Mon, 17 Jun 2024 13:07:11 -0500
Subject: [PATCH] Revert argon definition

---
 source/materials/MaterialsList.cc | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/source/materials/MaterialsList.cc b/source/materials/MaterialsList.cc
index 448e46cb3..371f04678 100644
--- a/source/materials/MaterialsList.cc
+++ b/source/materials/MaterialsList.cc
@@ -187,18 +187,13 @@ namespace materials {
     G4Material* mat = G4Material::GetMaterial(name, false);
 
     if (mat == 0) {
+      G4NistManager* nist = G4NistManager::Instance();
 
       mat = new G4Material(name, ArgonDensity(pressure), 1,
         kStateGas, temperature, pressure);
 
-      G4Element* Ar = new G4Element(name, "Ar", 1);
+      G4Element* Ar = nist->FindOrBuildElement("Ar");
 
-      G4int    massNumber = 40;
-      G4double abundance  = 100*perCent;
-      G4String isotopeName = "Ar" + std::to_string(massNumber);
-      G4Isotope* isotope = new G4Isotope(isotopeName, 18, massNumber, 39.962383123*g/mole);
-      Ar->AddIsotope(isotope, abundance);
-        
       mat->AddElement(Ar,1);
     }