LOW-ENERGY GAMMA-RAY TRANSITIONS IN Np237 FOLLOWING α DECAY OF Am241

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Abstract
The low-energy gamma-ray transitions in Np237 following α decay of Am241 have been studied by examination of the internal conversion spectrum at good resolution. Improved measurements of the energies and intensities of the lines due to the well-known transitions of energies 26.36, 33.21, 43.44, 55.56, 59.57, and 99.00 keV have been made. The existence of a weak transition of energy 67.52 keV has been confirmed. The existence of weak transitions of energies 27, 42.8, 70, and 76 keV, previously reported, has not been substantiated.For the 43.44-keV transition the L subshell ratios LI/LIII and LII/LIII are in disagreement as to the proportion of E2 component in the M1, E2 mixture assigned to this radiation, while the M subshell ratios are in disagreement with both L subshell ratios.The binding energies of the L, M, and N subshells in Np have been measured. All values are slightly higher than found by extrapolation from values at lower Z, though within experimental uncertainty the values are in agreement with such extrapolations.