Decay of 124I

Abstract

The decay of 124 I was investigated with beta-ray spectrometers and scintillation spectrometers by using carrier-free source produced by 121 Sb (α, n ) 124 I. The intensity ratio of the 1.54 MeV beta component to the 2.15 MeV one was obtained to be 1.07. Internal conversion ratios for the 604 keV gamma transition are K/L=7.3±0.4 and (M+N)/L=0.26±0.07. Internal conversion coefficients were determined to be (3.8± 0.6)×10 -3 , (2.5±0.4)×10 -3 , (7.9±1.5)×10 -4 , (3.3±0.8)×10 -4 , (2.9±0.7)×10 -4 , (2.1±0.4)×10 -4 and (2.1±0.8)×10 -4 for gamma transitions of 0.604, 0.72, 1.32, 1.37, 1.52, 1.69 and 2.08 MeV, respectively. The coefficient A 2 ( W ) in the directional correlation function \(\mathscr{W}\)(θ, W )=1+ A 2 ( W )P 2 (cos θ) was measured for the 2–(1.54 MeV β)2+(0.604 MeV γ)0+ cascade. The result is discussed on the basis of the ξ approximation, the modified B i j approximation and a more accurate method.