Nuclear data sheets for A = 100

Abstract

The 1960 version of the Nuclear Data Sheets for A = 100 has been revised on the basis of experimental data received prior to December 1, 1973. Information from approximately 100 papers and communications has been included in the present evaluation. Data on nine A = 100 nuclei are presented. The assignment of a 7.1-s activity to the decay of the 100Zr ground state and the assignment of 1.5-s and 3.1-s activities to the decay of 100Nb isomers adopted by the compilers differ from assignments proposed in the published literature. The decay scheme for 100Zr is not known, and the separate decay schemes for the two 100Nb isomers have not yet been determined. Many spin assignments have been made for the stable nuclei 100Mo and 100Ru. The decay scheme for 100Tc is well established, but no excited levels in this nucleus are known. The decay of 100Rh has been extensively studied. From an evaluation of all data, the compilers propose decay branching ratios to low-lying levels in 100Ru which differ somewhat from those given in the literature. The spins of a few low-lying lying levels in 100Rh are known. Details of the 100Pd decay scheme are uncertain since the decay energy and the decay branching ratio to the 100Rh ground state have not been measured and relative photon intensities for some transitions in the decay are not accurately known. The first level scheme for 100Pd, which has recently been proposed, is presented. The assignment of a 2.3-m activity to 100Ag decay appears well established, but the compilers regard the assignment of an 8-m activity to 100Ag decay as uncertain. The half-life of the 100Cd ground state has been measured, but no decay scheme has been proposed.