Problem 675

Summary:	No boost from CM->Lab for G4NeutronHPInelastic
Product:	Geant4	Reporter:	joa
Component:	processes/hadronic/models	Assignee:	tkoi
Status:	RESOLVED FIXED
Severity:	critical	CC:	asai, dennis.herbert.wright, johan.nyberg
Priority:	P2
Version:	5.2
Hardware:	PC
OS:	Linux

Description joa 2004-10-04 10:53:11 CEST

I believe that there should be a CM->Lab boost for the secondaries before
they are stacked for tracking. I've checked some numbers for
n+74Ge->n'+gammas+74Ge and they make no sense unless one converts from CM->Lab.
This have close to no effect on gammas and very little effect on the neutron
energy (since vcm ~ 1e-3 c) but makes quite a difference on the Ge ion energy...

best regards

Joa

Comment 1 Hans-Peter.Wellisch 2005-02-22 04:43:59 CET

Dear Joa,

  thank you for reporting this. I had a look. You are right, but it is not as
simple as ading a boost in the inelastic model. It is deep down in the
aggregation hirarchy - this may take me a while...

Many greetings,

Hans-Peter.

Comment 2 tkoi 2006-07-24 11:41:59 CEST

Sorry for delayed comments.
This is took over me and still under invetigation.

Tatsumi

Comment 3 dennis.herbert.wright 2007-05-08 18:57:25 CEST

This problem has been deferred until the end of 2007.   Beacuse the problem is
rather deep-seated, we are currently developing an alternate set of high precision neutron processes to fix it.

Comment 4 Johan Nyberg 2007-12-27 13:10:49 CET

Hi,

As far as I know, this severe problem is not yet solved. Any ideas when it will 
be solved?

Johan

Comment 5 dennis.herbert.wright 2008-01-04 22:42:32 CET

It now looks like an alternative model will be ready by Summer of 2008.  Due to
limited manpower, we will not fix the existing model because it is a large job.

Comment 6 dennis.herbert.wright 2008-07-01 18:57:01 CEST

Model will be replaced by new LLNL-based model by year's end, so no further work
on HP model will be done.

Comment 7 tkoi 2008-07-01 20:03:37 CEST

This problem is partially identified and an initial effort for fixing will be include coming beta release of v9.2 and further efforts still on going.

Tatsumi

Comment 8 tkoi 2009-01-29 01:58:01 CET

This is fixed at Geant4 v9.2.