Problem 950

Summary:	Trouble when adding NeutronHPJENDL DataSet to LElastic Model
Product:	Geant4	Reporter:	Roeder <roeder>
Component:	processes/hadronic/models/neutron_hp	Assignee:	tkoi
Status:	RESOLVED INVALID
Severity:	trivial
Priority:	P5
Version:	8.3
Hardware:	All
OS:	All

Description Roeder 2007-06-18 16:13:02 CEST

I have recently upgraded to GEANT 4.8.3 and I am having trouble comparing a previous simulation of neutron detection efficiency between 1 MeV and 100 MeV with a simulation that I did previously in GEANT 4.8.2. The neutrons in the simulation are scattering from a cylindrical detector composed of hydrogean and carbon (mimicing liquid scintillator).

I use in my Physics list for the Neutrons the LElastic model for the Hadron Elastic Scattering and the PreCompound Model for the Neutron Inelastic Scattering. For the GEANT 4.8.2 simulation, I then added the dataset to the LElastic model called "G4NeutronHPJENDLHEElasticData" to the LElastic model. For GEANT 4.8.2, adding the data set changed the efficiency calculation of the simulation only slightly. However, for GEANT4.8.3, suddennly the detection efficiency dropped some 50% when I included the data set, although it remains unchanged if I use only the LElastic model without the data set. In both cases, I am using the G4NDL3.10 data files. 

Please let me know if this is a "bug" or if it is something to do with my user code. Thanks,

Brian Roeder
Postdoc
LPC Caen
email - roeder@lpccaen.in2p3.fr

Comment 1 tkoi 2007-07-04 00:24:51 CEST

I have checked JENDLHE cross section of H and C with G4HadronElasticProcess.
There is no difference between the result of 8.2.p01 and 8.3. So that the probrem is not related to "G4NeutronHPJENDLHEElasticData".