Problem 1008

Summary: Several bugs in NeutronHPInelastic physics (reaction product kinematics)
Product: Geant4 Reporter: Pirard <pirard>
Component: processes/hadronic/models/neutron_hpAssignee: tkoi
Status: RESOLVED FIXED    
Severity: critical CC: desorgher, pirard
Priority: P2    
Version: 9.1   
Hardware: All   
OS: All   
URL: http://cosray.unibe.ch/~laurent/g4bug/
Attachments: Problem summary (pdf) + proposed source file corrections
Problem summary (2nd upload attempt)

Description Pirard 2008-03-21 15:57:52 CET 
Some bugs (6 in total) have been observed in the neutron inelastic reactions modeled with the NeutronHP model. They concern the kinematics of the reaction products:

#1: Wrong inelastic gamma-ray lines with Energy-angle data (DataType=6)
#2: Wrong energy for scattered neutron with Energy-angle data (DataType=6)
#3: Wrong angular distribution for scattered neutron with Energy-angle data (DataType=6)
#4: Wrong angular distribution for recoil target with Energy-angle data (DataType=6)
#5: Wrong energy and angular distributions for scattered neutron with Angular data (DataType=4)
#6: Wrong angular distribution for recoil target with Angular data (DataType=4)

The attached slides (pdf) present a detailed description of the problems. They have been illustrated in the cases of Aluminum (for MF=6) and Carbon (for MF=4) but concern a lot of (all) elements. Corrections are proposed for all identified bugs and corresponding modified source files are given. 

Note that:
1) Some of the identified problems are probably related to previous bug # 675.
2) Two of the corrections have been done using non-relativistic kinematics (but a relativistic formulation can be provided). 

Benoit Pirard and Laurent Desorgher
Comment 1 Pirard 2008-03-21 18:24:33 CET 
Problem summary (pdf) and proposed source file corrections can be downloaded at: 

http://cosray.unibe.ch/~laurent/g4bug/
Comment 2 tkoi 2008-06-27 00:45:04 CEST 
Dear Pirard,

Thank you for reoprting problem and contributing solutions.
Your contributions are included in coming beta release(9.2beta).

Tatsumi