Excited 0+ states and electric monopole transitions in 118Sn

Electric monopole transitions of 1758.04 (0+1-0+/sub g/), 2056.64 (0+2-0+/sub g/), and 298.58 keV (0+2-0+1) in 118Sn were observed in the internal conversion electron spectra with a π√2 iron-free magnetic β-ray spectrometer. Anisotropies of γ-γ angular correlations were measured for the 0-2-0 spin sequence to confirm the excited 0+ states. The dimensionless ratio of E0 to E2 transition probabilities X = B(E0,0+-0+/sub g/)/B(E2,0+-2+1) for the first, second, and third excited 0+ states were deduced as 0.0081 +- 0.0008, 0.13 +- 0.02, and <0.035, respectively. The relative monopole strength from the second excited 0+ state at 2056.6 keV was obtained as rho(0+2-0+1)/ rho(0+2-0+/sub g/) = 7.3 +- 0.8