The difference about neutron caputre between Geant4 and Fluka

The simulation is about thermal neutron bombing natural calcium,
the photons emitted are tallied, the result from Geant4 is:

the result from Fluka is:

it seems the result from Fluka is correct.

Maybe the neutron capture cross section is lack of some data about gamma emission.

Here, a run of example Hadr03
Physics constructor is QGSP_BIC_HP with the option UseOnlyPhotEvaporation

siyuan.mac.txt (347 Bytes)
siyuan.out.txt (3.0 KB)

@ maire, thanks!

Have you tried with the databases other than JEFF: GEANT 4 Libraries

yes, i tried Endf/B7.1, the result is the same with jeff.