Add generators for light-ion systems based on EPOS4

[alcaliva]

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[alcaliva]

@ddobrigk ,
it looks like we don't have pO for EPOS4. Shall we add it?

[ddobrigk]

@ddobrigk , it looks like we don't have pO for EPOS4. Shall we add it?

Hi Alberto, super thanks! I think it would be useful, though likely the highest priority should probably be pp, OO and Pb-Pb IMHO.

[alcaliva]

Hi @jackal1-66,
the build fails and I get the following error message:

4-No particles marked to be transported. Make sure they are marked correctly (see https://aliceo2group.github.io/simulation/docs/generators/).

Do you have any clue of what I should modify? I simply adapted the existing code for PbPb to light ions.

[jackal1-66]

Ciao Alberto, there are two issues in this:
1 - There is a problem with NeNe, this is on me. Since it is not super urgent by David, I would suggest you to drop the ini for the moment (I need to get in touch with the EPOS4 developers).
2 - constexpr double kOxygenEnergy = kA * kEnucleon; // 85760 GeV this should be halved: each Oxygen ion will have around 85760/2 GeV. This should fix the remaining issue.

[jackal1-66]

alisw/alidist#6109 I included a fix in EPOS4 for the NeNe collision system after discussing with Klaus Werner on the correct values to set in one of the tables. After this is merged your test should succeed

[alcaliva]

Hi @jackal1-66,
thanks! I fixed the oxygen energy.