How can generate new particles when they collision,
For example a piece of stone when collision It will break in small
pieces.

Thanks a lot

It´s make it different way in Houdini 13 with the new POPS?

Use dopimportrecords SOP. Feed “Impacts” in Data Path and Record field. It will generate points where collision will occur. You can use those points to emit particles from.

just enable Add Hit Attributes on your POP Solver
then insert (or branch and merge) POP Replicate to your pop stream and set it's group to @hitnum>0

the rest is just a matter of customizing that collision emission on POP Replicate node so you can:
in Birth tab set Kill Original Particle
in Shape tab set uniform scale to 0 so that all points originate on parent particle position
in Attributes Tab you can add some variance to velocity so you get some dispersion after impact
etc

tamte
just enable Add Hit Attributes on your POP Solver
then insert (or branch and merge) POP Replicate to your pop stream and set it's group to @hitnum>0

the rest is just a matter of customizing that collision emission on POP Replicate node so you can:
in Birth tab set Kill Original Particle
in Shape tab set uniform scale to 0 so that all points originate on parent particle position
in Attributes Tab you can add some variance to velocity so you get some dispersion after impact
etc

Thank you! Didn't expect to be that easy.