Particle parameters for conversion electrons in ¹⁵²Sm, ¹⁵²Gd and ¹⁶⁰Dy

Abstract

The internal conversion-electron particle parameters for several low-lying E2 transitions in ¹⁵²Sm, ¹⁵²Gd and ¹⁶⁰Dy have been determined by making e^--γ and γ-γ directional correlation measurements on the same source. In several of these cases both b₂(E2, K) and b₄(E2, K) have been measured. The results are: (i) 122 keV transition in ¹⁵²Sm:b₂(K)=1.82±0.05, b₄(K)=-1.06±0.14 and b₂(L)=1.30±0.07, (ii) 344 keV transition in 152Gd:b₂(K)=1.62±0.13, (iii) 87 keV transition in 160Dy:b₂(K)=1.90±0.07, b₄(K)=-1.25±0.18 and b₂(L)=1.37±0.18. The measured values of b₄(K) have also been used in determining b₂(K). In all the cases measured, no deviations from the theoretical values have been observed within the experimental errors.