Techniques of beta- and gamma-ray scintillation spectroscopy have been applied to a study of the decay radiations from 92.6-min La142. Several new gamma-ray transitions have been discovered and a gamma-gamma coincidence matrix has been established. Nine beta groups have been identified and evidence is presented substantiating the assignment of a first-forbidden unique character to the ground-state beta transition. Angular correlation studies have been performed on some of the gamma cascades. A decay-scheme based on the experimental results is discussed and some spin assignments are made. Some features of the decay modes are interpreted within the context of contemporary ideas about nuclear structure.
