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Question Thermal neutron interactions with Cadmium 

Forum: Hadronic Processes
Date: 02 Jul, 2010
From: Takahiro Nishioka <Takahiro Nishioka>

Hi,

I am attempting to simulate the thermal neutron interactions with Cadmium.
And, I am using Geant4.9.3 with the physics list "NeutronHP" and using "PhotonEvaporation".

According to this simulation, I observed gamma-ray peak of 113.6 keV.
However the peak was not measured in our experiment.

I confirmed the ENSDF (NuDat2.0:http://www.nndc.bnl.gov/nudat2/getdataset.jsp?nucleus=114CD&unc=nds).
Then, the gamma-ray of 113.6 keV seems to be generated from only 114Cd(n,n'g).
This reaction is inelastic scattering.

Some output of the simulation below.

DetNo	ParticleID	ParentID	Particle	Xposition		TotalEN		kineticEN	massEN		ProcName
2		1		0	 neutron	         0		939.565		2.5e-008	939.565		  nCapture
2		8		1	Cd114[0.0]	 0.0681591		106076		1.96539e-005	106076		   ionIoni
2		7		1	   gamma	 0.0681591		0.558441	0.558441	     0		Transportation
2		6		1	   gamma	 0.0681591		0.725311	0.725311	     0		Transportation
2		5		1	   gamma	 0.0681591		1.01515		1.01515	         0		Transportation
2		4		1	   gamma	 0.0681591		0.1136		0.1136	         0		Transportation		<--
2		3		1	   gamma	 0.0681591		2.94165		2.94165	         0		Transportation
2		2		1	   gamma	 0.0681591		3.68884		3.68884	         0		Transportation 

According to this, the gamma-ray of 113.6 keV (ParticleID:4) seems to be generated from not inelastic scattering but rather neutron capture.
I think this result is incorrect.

This cause because of my program? Or data files and program of GEANT4 wrong?

I confirmed the z48.a114 in photonevaporation data files.
I found the following sentence from z48.a114:
2.412500e+03 1.136000e+02 0.000e+00  1 0.00e+00   6.00 1.170e-01 8.632e-01 8.632e-02 8.162e-03 1.179e-02 1.607e-02 1.607e-03 2.342e-03 2.752e-05 3.701e-05 6.692e-03

Probably the cause is this data.
That means photonevaporation data is wrong?

I hope anybody has an idea to solve this problem,

regards, Takahiro.

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