Systematics in E2/M1 multipole mixing ratios of (2'+ - 2+) gamma transitions in even-even nuclei

A2sup(Expt.) and A4sup(Expt.), the angular correlation coefficients for the cascade 2'+ - 2+ - 0+ for almost all the even-even nuclei have been collected and reanalysed to calculate the amplitude mixing ratios 'delta' for 2'+ - 2+ gamma-transitions. There are two methods for analysing the data, viz. Arns and Wiedenbeck method using A2 values or A4 values, and that of Coleman using A2 and A4 values. The phases and values which are common in both the analyses, are taken for the analysis. The plot 1n bar delta/Esub(γ) bar versus mass number (A) is given along with the values predicted by Greiner's model and that of Krane. Many systematics obtained in the values and phases of 'delta' are presented. (author)