Nuclear data sheets for A = 89

The 1961 version of Nuclear Data Sheets for A = 89 and the 1970 Midstream Evaluation, A = 89 [M. W. Johns, J. Y. Park, S. M. Shafroth, D. M. Van Patter, and K. Way, Nuclear Data Tables 8, 373 (1970)], have been revised on the basis of experimental data received prior to August 1, 1975. Results from approximately 150 papers and communications chosen from the extensive literature for this A--chain have been included in the present evaluation. Numerous additional references dealing with reaction mechanism studies and nuclear structure theory are not included in this compilation, but are available upon request from the Nuclear Data Project. Data on nine A = 89 nuclei are presented. Only the half-lives for 89Se and 89Br have been determined. The decay schemes for 89Kr and 89Rb appear to be well established. The decay scheme for 89Sr is particularly simple, but the intensity for the single γ-ray in the decay is not well known. Many spin assignments have been made for levels in 89Sr, 89Y, and 89Zr from a variety of decay and reaction studies. The decay schemes for low--spin and high--spin isomers in both 89Zr and 89Nb appear to be well established, but the energy ordering of the two isomers in 89Nb is not known. On the basis of recent results, it appears that the previously claimed isotope 89Mo has not yet been observed