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Question Problem with neutrons interacting with Lithium 6 generating extra gammas 

Forum: Physics List
Date: 25 Aug, 2009
From: Calvin Giles <Calvin Giles>

I am trying to model the interaction of low energy neutrons with lithium 6 
which should create an alpha and a triton with a Q-value of 4.78 MeV. I am 
using the LHEP_PRECO_HP physics list (though I have tried several others too) 
and I get 3 additional alphas being created from the 4.78 MeV in the 
'inelastic' process. How do I correct this? I am generating neutrons with an 
energy of less than 1 eV, in this case 0.001 eV, but the situation is always 
the same once the neutrons are thermalised.

Idle> /run/beamOn 1   
EventAction: Event # 0 started

*********************************************************************************************************
* 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        100      1e-09     0        0        0         LithiumPowder initStep

1     0.085    -0.0311  100      0         0        0.0918   0.0918    LithiumPowder NeutronInelastic


*********************************************************************************************************
* G4Track Information:   Particle = gamma,   Track ID = 6,   Parent ID = 1
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     0.085    -0.0311  100      1.03      0        0        0         LithiumPowder initStep

1     -1.7     7.99     144      0.214     0        44.6     44.6      LithiumPowder compt

2     -0.856   8.5      141      0.139     0        2.71     47.3      LithiumPowder compt

3     -12.1    9.09     141      0.116     0        11.3     58.6      LithiumPowder compt

4     -18      19.4     160      0.116     0        22       80.6      World       Transportation

5     -23.1    28.3     175      0.116     0        18.8     99.4      OutOfWorld  Transportation

*********************************************************************************************************
* G4Track Information:   Particle = e-,   Track ID = 9,   Parent ID = 6
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     -12.1    9.09     141      0.023     0        0        0         LithiumPowder initStep

1     -12.1    9.09     141      0         0.023    0.00492  0.00492   LithiumPowder eIoni


*********************************************************************************************************
* G4Track Information:   Particle = e-,   Track ID = 8,   Parent ID = 6
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     -0.856   8.5      141      0.0745    0        0        0         LithiumPowder initStep

1     -0.842   8.5      141      0         0.0745   0.0387   0.0387    LithiumPowder eIoni


*********************************************************************************************************
* G4Track Information:   Particle = e-,   Track ID = 7,   Parent ID = 6
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     -1.7     7.99     144      0.812     0        0        0         LithiumPowder initStep

1     -1.65    8.79     145      0.231     0.581    1.37     1.37      LithiumPowder eIoni

2     -1.62    8.79     145      0         0.231    0.251    1.62      LithiumPowder eIoni


*********************************************************************************************************
* G4Track Information:   Particle = gamma,   Track ID = 5,   Parent ID = 1
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     0.085    -0.0311  100      1.03      0        0        0         LithiumPowder initStep

1     2.94     -12.9    30       1.03      0        71.2     71.2      Target      Transportation

2     4.97     -21.9    -19.6    0.265     0        50.5     122       Target      compt

3     6.05     -25.8    -16.7    0.265     0        4.96     127       World       Transportation

4     8.74     -35.4    -9.43    0.265     0        12.4     139       OutOfWorld  Transportation


*********************************************************************************************************
* G4Track Information:   Particle = e-,   Track ID = 10,   Parent ID = 5
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     4.97     -21.9    -19.6    0.76      0        0        0         Target      initStep

1     4.36     -21.3    -21.2    0.387     0.373    1.95     1.95      Target      eIoni

2     3.59     -21.8    -21.5    0.0129    0.374    1.18     3.13      Target      eIoni

3     3.59     -21.8    -21.5    0         0.0129   0.00381  3.14      Target      eIoni


*********************************************************************************************************
* G4Track Information:   Particle = gamma,   Track ID = 4,   Parent ID = 1
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     0.085    -0.0311  100      0.00302   0        0        0         LithiumPowder initStep

1     0.0855   0.00261  100      0         0.000697 0.034    0.034     LithiumPowder phot


*********************************************************************************************************
* G4Track Information:   Particle = e-,   Track ID = 11,   Parent ID = 4
*********************************************************************************************************

Step# X(mm)    Y(mm)    Z(mm)    KinE(MeV) dE(MeV)  StepLeng TrackLeng NextVolume  ProcName

0     0.0855   0.00261  100      0.00233   0        0        0         LithiumPowder initStep

1     0.0856   0.00258  100      0         0.00233  9.83e-05 9.83e-05  LithiumPowder eIoni


*********************************************************************************************************
* 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     0.085    -0.0311  100      1.17      0        0        0         LithiumPowder initStep

1     0.0845   -0.03    100      0         1.17     0.00294  0.00294   LithiumPowder ionIoni


*********************************************************************************************************
* 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     0.085    -0.0311  100      1.56      0        0        0         LithiumPowder initStep

1     0.0876   -0.0367  100      0         1.56     0.0146   0.0146    LithiumPowder hIoni

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1 Idea: Re: Problem with neutrons interacting with Lithium 6 generating extra gammas   (Vladimir Ivanchenko - 03 Sep, 2009)
2 None: Re: Problem with neutrons interacting with Lithium 6 generating extra gammas   (Yuri Shitov - 20 Sep, 2009)
3 None: Re: Problem with neutrons interacting with Lithium 6 generating extra gammas   (Koi, Tatsumi - 21 Sep, 2009)
1 None: Re: Problem with neutrons interacting with Lithium 6 generating extra gammas   (Calvin Giles - 22 Sep, 2009)
(_ None: Re: Problem with neutrons interacting with Lithium 6 generating extra gammas   (Koi, Tatsumi - 23 Sep, 2009)
(_ None: Re: Problem with neutrons interacting with Lithium 6 generating extra gammas   (Calvin Giles - 24 Sep, 2009)
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