Gamma-gamma directional correlation measurements in the decay of Ba133

摘要: The gamma rays following the electron capture decay of Ba z" have been studied using coincidence and directional correlation techniques. existence with energies 162 keV 222 has ascertained. functions for 356 keV-82 keV, 302 80 276 keV-162 cascades are found to be, respectively: W(O) = 1 -t- (0.0331 =k0.0017)el(cos 0)+ (0.0045 =k0.0033)Pl(cos 0), -- (0.0238± 0.0060)ea(cos 0)-F (0.0061-4-0.0089)P,(cos + (0.0319)=l=0.0045)e,(cos (0.005=k0.009)e,(cos 1- (0.328 :(:0.009)P2(cos 0)--(0.067:k0.016)P~(cos 0). These results support spin sequence ~+, t +, ½+, ground state, 82, 162, 384 438 levels Cs 1". measured mixing ratios are: keV:(63:k9)% E2+(37:k9)% MI; 82 keV: (97.6-4-0.1)% M1+(2.4:E0.1)% E2; (95.14-0.6)% E2+(4.9:k0.6)% Ml;276keV:pureE2;302keV: (99.7+0.1)% MI-F(0.3:E0.1)% pure E2. I RADIOACTIVITY BR 1" (from Oak Ridge);