Particles not rendered with 2.80

Good afternoon

When I do a simple particle system added to a plane I can see that particles are generated with the default “halo” rendering…

Particles are seen in the 3d viewport as well in the 3d rendering preview…but when I hit F12 to render it, no particles are rendered…

Also when I use another object for rendering, then no particles are displayed at all, regardless in which view mode…

Something I missed here?

thanks in advance
richard