Problem 2367 - Beta-ray energy spectrum shows stepping shape.
Summary: Beta-ray energy spectrum shows stepping shape.
Status: RESOLVED FIXED
Alias: None
Product: Geant4
Classification: Unclassified
Component: processes/hadronic/models (show other problems)
Version: 10.7
Hardware: All All
: P4 minor
Assignee: dennis.herbert.wright
URL:
Depends on:
Blocks:
 
Reported: 2021-05-13 03:04 CEST by aso
Modified: 2023-03-30 18:23 CEST (History)
0 users

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Attachments
An example of stepped-shape beta-energy spectrum with its macro-file. (564.26 KB, application/pdf)
2021-05-13 03:04 CEST, aso 		Details
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Description aso 2021-05-13 03:04:46 CEST 
Created attachment 691 [details]
An example of stepped-shape beta-energy spectrum with its macro-file.

The Beta-ray spectrum shows a stepped shape when the distribution was scored with fine binning and enough number of events. This is caused by the resolution of calculated energy distribution in G4BetaMinusDecay::SetUpBetaSpectrumSampler(). (e.g. fixed by G4int npti=100 ).

  The attached slide shows the beta energy spectrum using
  examples/extended/raioactivedecay/rdecay01 with the C14.mac.
 
  Because the required resolution will depend on each application, the number (npti) in G4BetaMinusDecay::SetUpBetaSpectrumSampler() need to be modified by users via UI-command or public method.
Comment 1 dennis.herbert.wright 2023-03-30 18:23:18 CEST 
Sampling of binned spectral shape now done assuming sloped lines instead of flat.  Stair-step structure removed.