How do I add transparency to multiple vector shapes and have the result stay vector?

Hello my favorite helpers!

I'm afraid to even say how much time I have spent on this! Hours and hours. Even with looking in this forum I come up with the wrong end result.

This is what I have... (this is a jpg, but my file is a vector of the light blue and dark blue rays)

I need the end result to be this... but it NEEDS to stay a vector shape because I need to be able to re-scale it to different sizes.

I can't figure out how to make the transparency stay as a CMYK vector and still get the same shape I need in the end. This end result will be on a dark colored background.

I would so appreciate your help with this!

bluerays.cdr