Search for stable octupole deformation in 225Fr

Levels in 225Fr have been studied by γ-ray and conversion-electron spectroscopy following the β-decay of 225Rn, and by the 226Ra(t,α)225Fr single-proton-pickup reaction. Multipolarities were obtained for ∼50 γ-transitions, and a level scheme was established in which definite spin-parity values were determined for over 20 of the 48 levels. Although low-lying rotational bands of both parities exist for K = 12 and K = 32, there is no experimental …