What to do with JJ?

Something similar to this...

You and the CO have slightly more than the average stack (about 40-45 BBs), and about half of the remaining field will money. You each have been playing solid poker and haven't been splashing around with junk (that is neither of you have shown down junky hands).

You have JJ in early position and raise to 3X the BB.

It is folded to the CO who raises to about 9X the BB.

What do you do?

Any help would be great.

Excelsior