ISOTOPIC ANOMALIES IN SAMARIUM

The solar isotopic composition of Sm is decomposed into s, r and p components. The anomaly pattern discovered [1] in EK1-04 Allende inclusion can be presented as a fractionation of the average s-pattern from the average r-pattern. This representation requires a fractionation of 0.029% (amu)-1 and either (1) a 0.42% deficiency of s relative to r and a 0.15% deficiency of p relative to r, or (2) a 0.42% excess of r relative to s and a 0.27% excess of p relative to s. The nature of this anomaly suggests a systematic physical fractionation of r, s and p nuclei from each other in the initial condition leading to EK1-04. A neighboring supernova injection would not be expected to produce this anomaly. © 1979.