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Forum: Hadronic Processes
Re: Question Cl(n,p) Excited States Energy Shifts? (Malachi Schram)
Re: Idea Re: Cl(n,p) Excited States Energy Shifts? (Vladimir Ivanchenko)
Date: 04 Jun, 2012
From: Malachi Schram <Malachi Schram>

Hi Vladimir,

Please find attached a comparison between Geant4.9.4.x and Geant4.9.5.x.
I checked the kinematic broading and leading edge of each peak.
The ground state (highest energy peak) is at the correct place and has the proper kinematic broading, however, all the excited states are shifted.

35S Excited states:
2938.64(11)
2717.10(16)
2347.78(10)
1991.33(5)
1572.372(6)
0 (ground)

Incoming neutron energy (En) was set to 4.7MeV.
Q-value for 35Cl(n,p) reaction is 0.615MeV
Therefore, the upper edge of the ground state should be at ~5.315MeV.
Next, the upper edge of the 1st excited state should be at ~3.74MeV.
This is indeed the case for MCNPX but not for Geant (as shown in attached figure).

Below are the data versions I'm using for Geant4.9.5.x:

G4LEVELGAMMADATA=/.../PhotonEvaporation2.2
G4NEUTRONXSDATA=/.../G4NEUTRONXS1.1
G4LEDATA=/.../G4EMLOW6.23
G4NEUTRONHPDATA=/.../G4NDL4.0
G4RADIOACTIVEDATA=/.../RadioactiveDecay3.4
G4ABLADATA=/.../G4ABLA3.0
G4PIIDATA=/.../G4PII1.3
G4REALSURFACEDATA=/.../RealSurface1.0

I'm open to any comments or suggestions.

Thank you in advance,

Malachi

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/06/04/06.11-92708-or_35Cln,p_Reaction.jpg

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1 Question: Re: Cl(n,p) Excited States Energy Shifts?   (Malachi Schram - 05 Jun, 2012)
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