UNR

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 <?xml version="1.0"?>
<Walk>
<Simulation>
  <WalkType Type="Diffusion Monte Carlo">
    <Algorithm Type="Unr" VMC="False" >
       <RandomWalk>
         <Length Steps="1000" Block="1" TimeStep="0.005" SubSteps="5"/>
         <Population WalkersPerProcessor="2000"
           UnderFlow="0.25" OverFlow="2.5" HardOverFlow="5.0"
           Punch="True" PunchType="Single" PunchInterval="50" MaxWeight="7.0"
           Balance="True" BalanceInterval="1" Accumulate="True" >
           <Control Type="SimpleReynolds" />
           </Population>
          </RandomWalk>
          <ReferenceEnergy Adjust="Target" Memory="1"
          TargetInterval="2" TargetPerProcessor="2000" />
          <EnergyCut TargetEnergy="-140.0" CutFactor="4.0" ForceCut="True" ForceCutFactor="1.0"/>
    </Algorithm>
  </WalkType>
</Simulation>
<Parameters>
  <Dimensions Dimensions="3" Particles="26"/>
  <Random Generator="mt19937" Seed="2005"/>
</Parameters>
</Walk>

This is a DMC with branching turned off hence it should behave like a VMC. Not fully tested.

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