The IGo potential is used for the calculation of barrier penetrabilities for ground and excited state transitions of even mass nuclei and for transitions of odd-mass nuclei, measured after 1959. The barrier penetration factors were calculated by numerical integration in the WKB approximation, taking into account centrifugal barrier effects for even-even nuclei, but ignoring noncentral interactions. Using the calculated penetration factors and the experimental alpha half-lives, the reduced level widths were calculated in each case. Hindrance factors for odd-mass alpha-particle emitters ate also given.

Barrier penetrabilities, reduced widths, and hindrance factors are given for odd-mass alpha-particle emitters measured after 1959. The method of calculation is as in a previous publication. The calculated quantities are given for the total decay energy.

The lgo potential is used for the calculation of barrier penetrabilities for ground-state and excited-state transitions of even–even nuclei and for transitions of odd–odd nuclei, measured after 1959. The barrier penetration factors were calculated by numerical integration in the WKB approximation, taking into consideration centrifugal barrier effects for even–even nuclei, but ignoring non-central interactions. Using the calculated penetration factors and the experimental alpha half-lives, the reduced level widths were calculated in each case. The barrier penetration factors and the reduced level widths are given for total decay energy (alpha-particle energy plus electron-screening correction plus recoil energy).