Problem 1008 - Several bugs in NeutronHPInelastic physics (reaction product kinematics)
Summary: Several bugs in NeutronHPInelastic physics (reaction product kinematics)
Status: RESOLVED FIXED
Alias: None
Product: Geant4
Classification: Unclassified
Component: processes/hadronic/models/neutron_hp (show other problems)
Version: 9.1
Hardware: All All
: P2 critical
Assignee: tkoi
URL: http://cosray.unibe.ch/~laurent/g4bug/
Depends on:
Blocks:
 
Reported: 2008-03-21 15:57 CET by Pirard
Modified: 2008-06-27 00:45 CEST (History)
2 users (show)

See Also:

Attachments
Problem summary (pdf) + proposed source file corrections (deleted)
2008-03-21 15:57 CET, Pirard 		Details
Problem summary (2nd upload attempt) (deleted)
2008-03-21 16:09 CET, Pirard 		Details
Add an attachment (proposed patch, testcase, etc.)

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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