Double-Gap Soft Diffraction Results from CDF

We present a study of (anti)pp collisions with a leading antiproton and a rapidity gap in addition to that associated with the antiproton. The second gap is either within the region available to the proton dissociation products, (anti)p + p → ((anti)p + gap) + X + gap + Y, or adjacent to the outgoing proton (anti)p + p → ((anti)p + gap) + X + (gap + p ). Results are reported for two-gap to one-gap event ratios and compared with one-gap to no-gap ratios and with theoretical expectations. (author)