EXPERIMENTAL EVIDENCE FOR THE DEFORMATION OF 128Ba

Abstract

The half-life of the 283-keV gamma transition in ¹²⁸Ba has been shown to be less than (1.1 ± 0.2) × 10⁻¹⁰ sec, and its multipolarity has been shown to be E2. This E2 transition rate is enhanced by a factor of at least 58 over the single-particle estimates, indicating that the nucleus ¹²⁸Ba is deformed at least to the extent β = 0.21.