Fig. 1. Spectra of γ-rays.

The γ-rays were emitted following the bombardment of ¹²⁰Sn targets by ²²²Rn (black), ²²⁴Rn (blue) and ²²⁶Rn (red). The γ-rays were corrected for Doppler shift assuming that they are emitted from the scattered projectile. Random coincidences between Miniball γ-ray and silicon particle detectors have been subtracted. The transitions which give rise to the observed full-energy peaks are labelled by the spin and parity of the initial and final quantum states. The assignments of the transitions from the negative-parity states in ^224,226Rn are tentative (see text).