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Forum: Hadronic Processes
Re: None Strange reaction in the LHEP_BIC_HP (Hidetoshi Ohshita)
Re: None Re: Strange reaction in the LHEP_BIC_HP (Vladimir IVANTCHENKO )
Re: None Re: Strange reaction in the LHEP_BIC_HP (michel maire)
Date: 25 Apr, 2007
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Wed, 25 Apr 2007, michel maire wrote:

> *** Discussion title: Hadronic Processes
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/hadronprocess/686/1/1"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> >> > Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
> >> >     0     -9 cm      0 fm      0 fm    100 MeV     0 eV      0 fm      0 fm        World    initStep
> >> >     1   -7.5 cm      0 fm      0 fm    100 MeV     0 eV    1.5 cm    1.5 cm        World  Transportation
> >> >     2   -6.5 cm      0 fm      0 fm    100 MeV     0 eV      1 cm    2.5 cm         Lead  Transportation
> >> >     3     -6 cm      0 fm      0 fm    100 MeV     0 eV      5 mm      3 cm         Lead  Transportation
> >> >     4     -5 cm      0 fm      0 fm    100 MeV     0 eV      1 cm      4 cm         Lead  Transportation
> >> >     5   -4.5 cm      0 fm      0 fm    100 MeV     0 eV      5 mm    4.5 cm         Lead  Transportation
> >> >     6   -3.5 cm      0 fm      0 fm    100 MeV     0 eV      1 cm    5.5 cm         Lead  Transportation
> >> >     7     -3 cm      0 fm      0 fm    100 MeV     0 eV      5 mm      6 cm         Lead  Transportation
> >> >     8     -2 cm      0 fm      0 fm    100 MeV     0 eV      1 cm      7 cm         Lead  Transportation
> >> >     9   -1.5 cm      0 fm      0 fm    100 MeV     0 eV      5 mm    7.5 cm         Lead  Transportation
> >> >    10     -5 mm      0 fm      0 fm    100 MeV     0 eV      1 cm    8.5 cm         Lead  Transportation
> >> >    11      0 fm      0 fm      0 fm    100 MeV     0 eV      5 mm      9 cm         Lead  Transportation
> >> >    12      1 cm      0 fm      0 fm    100 MeV     0 eV      1 cm     10 cm         Lead  Transportation
> >> >    13    1.5 cm      0 fm      0 fm    100 MeV     0 eV      5 mm   10.5 cm         Lead  Transportation
> >> >    14    2.5 cm      0 fm      0 fm    100 MeV     0 eV      1 cm   11.5 cm         Lead  Transportation
> >> >    15      3 cm      0 fm      0 fm    100 MeV     0 eV      5 mm     12 cm         Lead  Transportation
> >> >    16      4 cm      0 fm      0 fm    100 MeV     0 eV      1 cm     13 cm         Lead  Transportation
> >> >    17    4.5 cm      0 fm      0 fm    100 MeV     0 eV      5 mm   13.5 cm         Lead  Transportation
> >> >    18    5.5 cm      0 fm      0 fm    100 MeV     0 eV      1 cm   14.5 cm         Lead  Transportation
> >> >    19      6 cm      0 fm      0 fm    100 MeV     0 eV      5 mm     15 cm         Lead  Transportation
> >> >    20   6.04 cm      0 fm      0 fm    100 MeV  4.49 keV   382 um     15 cm         Lead    hElastic
> >> >    21      7 cm    884 um    182 um    100 MeV     0 eV   9.66 mm     16 cm         Lead  Transportation
> >> >    22    7.5 cm   1.34 mm    276 um    100 MeV     0 eV   5.02 mm   16.5 cm         Lead  Transportation
> >> >    23      9 cm   2.72 mm    559 um    100 MeV     0 eV   1.51 cm     18 cm   OutOfWorld  Transportation
> >> > ---> End of event: 0
> >> >    Absorber: total energy: 4.4887263 keV       total track length:       0 fm
> >> >         Gap: total energy:       0 eV        total track length:       0 fm
> 
> >> 
> >> Hello Hidetoshi,
> >> 
> >> The results is correct, because in this ElasticScattering process there is 
> >> a threshold 100 keV - if recoil has lower kinetic energy it is not created 
> >> as a secondary particle and its kinetic energy is added to energy deposit. 
> >> This threshold can be set to another value (including zero) via public 
> >> method.
> >> 
> >> regards,
> >> 
> >> -- 
> >>     Vladimir Ivanchenko  
> >>     ### CERN PH SFT Tel: +41-22-76-78-871  Vladimir.Ivantchenko@cern.ch ###
> >>
> 
>  from where this 4.49 keV comes ? What about energy conservation ? 
> 

It is specific of LElastic model (LHEP package). By the way, LHEP_BIC_HP
Physics Lists is obsolete. In Geant4 8.2 the list of obsolete Physics
Lists were anounced.  They will be removed in G4 release 9.0 (June this
year).  I would suggest to use QGSP_BIC_HP - there energy/momentum balance
is OK.

VI 

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1 None: Re: Strange reaction in the LHEP_BIC_HP   (Hidetoshi Ohshita - 26 Apr, 2007)
(_ None: Re: Strange reaction in the LHEP_BIC_HP   (Vladimir IVANTCHENKO - 29 Apr, 2007)
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