Energy Levels ofNp237Populated by the Beta Decay ofU237

A spectroscopic investigation has been made of the radiations from ${\mathrm{U}}^{237}$ with magnetic 180° spectrographs and a double-focusing spectrometer, and with scintillation and coincidence spectrometers. Energy levels are identified at 0, 33.20, 59.57, 103.0, 267.5, 332.3, 368.5, and 370.9 kev, and spin and parity assignments are given for all the levels from the gamma-ray multipolarity and beta-decay information. Conversion-coefficient information is presented, and an anomaly in the electric-dipole conversion coefficients is discussed. A new rotational band with $K=\frac{1}{2}$ is postulated, with base state at 332.3 kev.