Problem 891

Summary:	Infinite loop in Muon- Capture
Product:	Geant4	Reporter:	liuhm
Component:	processes/hadronic/stopping	Assignee:	dennis.herbert.wright
Status:	RESOLVED FIXED
Severity:	critical
Priority:	P2
Version:	8.1
Hardware:	PC
OS:	Linux

Description liuhm 2006-09-20 19:14:00 CEST

Dear Geant4 experts,

We are using Gean4.8.1.p01 and hadronic package QGSP
for our detectorsimulation. We find that for some muon-
at rest, an infinite loop occurs in G4MuonMinusCaptureAtRest.

We designed a simple program to confirm this program:

The detector is a box filled with our gas (a mixture of He
and propane C3H8), the event generator produce a mu- at rest
in the center of box. After about 50000 event running, the
program goes to infinite loop. We traced the event step and
found the dead-loop in G4MuonMinusCaptureAtRest::DoMuCapture.

Your help will be greatly appreciated.

Huaimin Liu
IHEP, Beijing

Comment 1 dennis.herbert.wright 2006-09-20 19:36:59 CEST

Please send a copy of your main() and any other necessary code to me at
dwright@slac.stanford.edu along with the macro you used to run it.  I will then
try to reproduce the problem.

Comment 2 dennis.herbert.wright 2006-12-28 22:31:59 CET

G4MuonMinusCaptureAtRest re-written by Vladimir Ivanchenko to address infinite
loop problem.  The fixed version is included in Geant4 V8.2.