Adapted values of the shell effect for symmetric fission in GEF 2019/1.2
------------------------------------------------------------------------

Default value: Delta_S0 = 0 MeV

Z=89
        A                226
        Delta_S0/MeV    -0.3

Z=90
        A                228    229    230    231    232    233        
        Delta_S0/MeV     0.2    0.4    0.7    0.8    0.9    0.9

Z=92    
        A                233    234    all other isotopes                
        Delta_S0/MeV     0.4    0.4    0.2

Z>=93
        A                all isotopes                
        Delta_S0/MeV     -0.3

The values are adjusted to the relative yield of the symmetric channel
in measured mass distributions. Data from JEFF 3.3 (nth,f) and 
refs. [1,2] (transfer reactions). See ref. [3] for the meaning of Delta_S0.

[1] H. J. Specht, Physica Scripta 10A (1974) 21
[2] H. J. Specht, Rev. Mod. Phys. 46 (1974) 773
[3] K.-H. Schmidt, B. Jurado, C. Amouroux, C. Schmitt,
    Nucl. Data Sheets 131 (2016) 107 