Abstract
nuclei were aligned through the electric quadrupole and magnetic hyperfine couplings in NpRbz, cooled to 0.2-4.2°K. A complete experiment, with rotatable monocrystalline sample, solid-state counter, thermometer, and goniometer, was enclosed in a copper container filled with gas and thermally attached to ½ mole of paramagnetic salt which could be cooled magnetically. The measured temperature dependence of the -particle anisotropy gives , for the signs of the hyperfine coupling constants in Np. The particles were observed to be emitted preferentially along the direction of the nuclear angular momentum vector. The results are consistent with bonding in the Np ion and with Hill and Wheeler's prediction of the role of barrier penetration in emission from nonspherical nuclei.
- Received 28 June 1961
DOI:https://doi.org/10.1103/PhysRev.124.1512
©1961 American Physical Society