Problem 1986

Summary:	E0 transitions not being handled correctly
Product:	Geant4	Reporter:	Daniel Cox <danielcox404>
Component:	processes/hadronic/models/de_excitation/photon_evaporation	Assignee:	Vladimir.Ivantchenko
Status:	ASSIGNED ---
Severity:	enhancement	CC:	Vladimir.Ivantchenko
Priority:	P4
Version:	10.3
Hardware:	All
OS:	All

Description Daniel Cox 2017-06-26 11:29:48 CEST

In the PhotoEvaporation4.3 data it doesn't look like any E0 (0+) transitions have a non-zero conversion coefficient. This means they always proceed via gamma decay, which is the opposite of what should be happening for E0's.

I checked this with Pb186 and Pb188 which both have low lying 0+ states that decay by E0, they always proceed via gamma emission.

Comment 1 Vladimir.Ivantchenko 2017-07-01 16:52:33 CEST

Hi Dennis,

please, switch this problem to me.

Comment 2 Vladimir.Ivantchenko 2017-07-01 16:55:44 CEST

Hello Daniel,

thank you for this bug report. We are in transition to the new code for gamma de-excitation, so it is important to know : which version of G4 you are using, can you reproduce the problem in examples/extended/radioactive_decay/rdecay01.

Vladimir

Comment 3 Daniel Cox 2017-07-03 11:16:43 CEST

Hi Vladimir,
I'm running 10.3.1 and can confirm this is still not working in rdecay01.
591 591 0 0+ 0 0.00 0 0 0 0 0 0 0 0 0 0 0
In the, soon to be old, data file z82.a188 this is the line for the first excited 0+ state and it doesn't have any conversion coefficient.

Danny

Comment 4 Vladimir.Ivantchenko 2018-02-07 17:07:12 CET

Hello Daniel,

Absence of conversion for these levels is due to absence this information in our DB. DB is obtained via automatic procedures following by manual corrections. Likely the data are not in ENDF or other sources.

The improvement may come from your side if you propose modifications to z82.a188 and z82.a186 files on top of PhotoEvaporation5.2 or PhotoEvaporation4.3.


Vladimir