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Question wrong energy of secondary particles in 6Li(n.alpha)T reaction 

Keywords: enery wrong 6Li(n,alpha)T reaction
Forum: Hadronic Processes
Date: 01 Jun, 2008
From: Ming.Su <suming801@gmail.com>

Hi:
   I am using Geant4 to simulate the reaction 6Li(n,alpha)T,and the Q value is 4.79 MeV. My physicslist is using NeutronHP model. when i am running my program in Geant4.9.1,the energy of the  secondary particles alpha and T is very low(10e-9 MeV  see below),that is obviously wrong. but when running the same program in Geant4.7.1 ,the energy of the secondary particles alpha and T becomes correct(1.91 MeV and 2.54 MeV).

  so ,my questions are :  Is this a bug in Geant4.9.1 or there is some other reason?  If I want to collect the energy infomation in 4.9.1 , what could i do next?

screen output when using Geant4.9.1:

Start Run processing.
 NumberOfParticlesToBeGenerated: 1
Generating isotropic vector: (0.00270525628782296,0.004151107211647975,-0.9999877248733279)
Creating primaries and assigning to vertex
Particle name: neutron
       Energy: 2.53e-08
     Position: (0,0,500)
    Direction: (0.00270525628782296,0.004151107211647975,-0.9999877248733279)
 Primary Vetex generated !
=====================================
  G4EventManager::ProcessOneEvent()  
=====================================

---> Begin of event: 0

--------- Ranecu engine status ---------
 Initial seed (index) = 0
 Current couple of seeds = 1729306860, 316096113
----------------------------------------
1 primaries are passed from G4EventTransformer.
!!!!!!! Now start processing an event !!!!!!!
### pop requested out of 1 stacked tracks.

*********************************************************************************************************
* G4Track Information:   Particle = neutron,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************
Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0        0        0      500  2.53e-08        0        0         0       World initStep
    1     1.31     2.01       15  2.53e-08        0      485       485 CylinderLiG Transportation
    2     1.32     2.02     13.5         0        0     1.48       486 CylinderLiG inelastic
Track (trackID 1, parentID 0) is processed with stopping code 2
### pop requested out of 2 stacked tracks.

*********************************************************************************************************
* G4Track Information:   Particle = alpha,   Track ID = 3,   Parent ID = 1
*********************************************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0     1.32     2.02     13.5  5.32e-09        0        0         0 CylinderLiG initStep
    1     1.32     2.02     13.5         0 5.32e-09 2.21e-08  2.21e-08 CylinderLiG msc
Track (trackID 3, parentID 1) is processed with stopping code 2
### pop requested out of 1 stacked tracks.

*********************************************************************************************************
* G4Track Information:   Particle = triton,   Track ID = 2,   Parent ID = 1
*********************************************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0     1.32     2.02     13.5  4.01e-09        0        0         0 CylinderLiG initStep
    1     1.32     2.02     13.5         0 4.01e-09 6.66e-08  6.66e-08 CylinderLiG hLowEIoni

screen output when using Geant4.7.1:

*********************************************************************************************************
* G4Track Information:   Particle = neutron,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0        0        0      500  2.53e-08        0        0         0       World initStep
    1    -1.12    -7.97       20  2.53e-08        0      480       480 CylinderLiG Transportation
  the number of secondary reaction of this interaction  is  : 0

  the post reaction  is  : Transportation

  the dynamic particle  is  : neutron
    2    -1.12    -7.98     19.5         0        0    0.462       481 CylinderLiG inelastic
  the number of secondary reaction of this interaction  is  : 2

  the post reaction  is  : inelastic

the dynamic particle is : neutron Track (trackID 1, parentID 0) is processed with stopping code 2 ### pop requested out of 2 stacked tracks.

*********************************************************************************************************
* G4Track Information:   Particle = alpha,   Track ID = 3,   Parent ID = 1
*********************************************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0    -1.12    -7.98     19.5      1.91        0        0         0 CylinderLiG initStep
    1    -1.12    -7.98     19.5      1.85   0.0652 0.000197  0.000197 CylinderLiG hLowEIoni

Track (trackID 3, parentID 1) is processed with stopping code 2 ### pop requested out of 1 stacked tracks.

*********************************************************************************************************
* G4Track Information:   Particle = triton,   Track ID = 2,   Parent ID = 1
*********************************************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0    -1.12    -7.98     19.5      2.54        0        0         0 CylinderLiG initStep
    1    -1.12    -7.98     19.5      2.51     0.03 0.000576  0.000576 CylinderLiG hLowEIoni

Best regards

 Ming Su

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1 None: Re: wrong energy of secondary particles in 6Li(n.alpha)T reaction   (Koi, Tatsumi - 03 Jun, 2008)
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