Penetration Effects for Internal Conversions in the Odd-Mass Isotopes of La and Cs

Abstract

Penetration parameters λ are determined by using internal conversion intensities and coefficients for low energy hindered M1 transitions of ¹³¹Cs, ¹³⁵La, ¹³⁷La and ¹³⁹La together with E2/M1 mixing ratios δ². The results are; λ(86.9, ¹³⁵La)=14.5±5.5, λ(10.5, ¹³⁷La)=10±5, λ(166, ¹³⁹La)=3.6±1.8 and λ(92.3, ¹³¹Cs)=4±4, where numbers in parentheses are transition energies in keV.