Problem 1922

Summary: Sr85 decay file : ENSDF file not normalised , intensity of 514keV gamma is affected - RadioactiveDecay V4.X
Product: Geant4 Reporter: Gilles Grégoire <gilles.gregoire>
Component: processes/hadronic/models/radioactive_decayAssignee: desorgher
Status: RESOLVED FIXED    
Severity: normal CC: desorgher
Priority: P4    
Version: 10.2   
Hardware: All   
OS: All   
Attachments: updated Sr-85 decay file
updated Sr-85 decay file with NUCLEIDES-DDEP data

Description Gilles Grégoire 2016-11-29 15:20:10 CET 
Created attachment 431 [details]
updated Sr-85 decay file

I know that ENSDF files are processed automatically

In Sr-85 ENSDF file,
EC branching ratio to ground level of Rb-85 is set to 8 %
EC branching ratio to level 514 keV of Rb-85 is set to 96 % (uncertainty 4)

In the decay data scheme,available at the following adresses, theses values are set to 4 and 96 

http://www.nndc.bnl.gov/chart/decaysearchdirect.jsp?nuc=85SR&unc=nds
http://www.nndc.bnl.gov/chart/getdecayscheme.jsp?nucleus=85RB&dsid=85sr%20ec%20decay%20(64.849%20d)&unc=nds

ENSDF processing normalizes data so a factor of about 100/104 is applied to Sr-85 data

So 514 keV gamma intensity is set to about 92.3 % instead of 96 %

I have only checked radioactivedecay databases v4.2.X and V4.3.X

I have also checked NUCLEIDES-DDEP evaluation which is quite different (branching ratio to ground level is 0.8%,branching ratio to 514keV level is 99.2%)

I join an updated file:
ENSDF based file with 4% to Rb-85 ground level intensities: updated_ENSDF_z38.a85 

Best regards,

Gilles Grégoire
Comment 1 Gilles Grégoire 2016-11-29 15:21:25 CET 
Created attachment 432 [details]
updated Sr-85 decay file with NUCLEIDES-DDEP data
Comment 2 Laurent Desorgher 2017-01-30 17:30:15 CET 
Dear Gilles,

Thanks for your information concerning the Sr-85 decay file.
Indeed most of the files in the databases  are produced automatically from ENSDF original data that contains sometimes contradictory data. It is not possible for  to write by hand  more than   2000 files. Therefore we appreciate the correction send by the user. In the future we plan to correct/improve  files case by case to avoid any big corruption of the data. My plan is this year to improve some radioactive decay and photo evaporation files by using the DDEP data. I will look at your proposed correction based on DDEP for Sr-85 and probably include it in a next version of the database.


Best regards


Laurent
Comment 3 Laurent Desorgher 2017-02-01 17:24:44 CET 
Hello,

For your information I have correct the Sr-85 file for a future patch release of GEANT4.10.3 according to DDEP.

Best regards

Laurent Desorgher