Multipole mixing ratio

The decay of 36-s 106Tc and of 5-s 108Tc into excited levels of the even-even isotopes 106Ru and 108Ru was studied in detail. Extended level schemes, spin assignments, multipole mixing ratios and B(E2) values for 108Ru and... 

The multipole mixing ratio S of mixed M1+E2 radiation (d = IE2/M1I) as well as the phase angle between E2 and Ml components can be obtained from the relative areas of the corresponding peaks (Kistner 1968 Wagner et al. 1968 Atac et al. 1968). The value of the phase angle has a relevance in testing the time reversal in electromagnetic interaction. No violation of time reversal was found in Mossbauer experiments (Kalvius et al. 1968 Mullen 1986). 

The E2/M1 mixing ratio was 8 = 0-49(6). Interference effects were observed between the multipoles using an oriented single crystal of YbCls.dHjO. This is analogous to the Ru work, and the measured phase angle was in agreement with time-reversal invariance. 

Endt (1981) evaluated 1,340 y-ray transitions in A = 91-150 nuclek The transition rates were classified according to electric or magnetic multipole character and were expressed in Weisskopf units. Transitions, which can be mixed in principle, are only listed if the mixing ratio has been measured. The strengths S = Ti Ti) usually scatter appreciably, nevertheless, upper limits could be established fi-om the data. These are 0.01,300,100, and 30 W. u. for El, E2, E3, and E4 and 1, 1, 10, and 30 W. u. for Ml, M2, M3, and M4 radiations, respectively. For upper limits in other regions see (Firestone et al. 1996). The strengths are usually enhanced for E2, and E3, while the El, M2 transitions are usually hindered. 

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