Nuclear Data Sheets for A = 100

Abstract

The evaluated experimental data are presented for 15 known nuclides of mass 100 (Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn). High spin excitations are known for 100Sr, 100Zr, 100Mo, 100Tc, 100Ru, 100Rh, 100Pd, 100Ag, and 100Cd. The neutron capture data are available for 100Tc and 100Ru. Particle transfer data exist for structures in 100Nb, 100Mo, 100Tc and 100Ru. The two-neutrino ββ decay mode in 100Mo is fully established with measured half-life and population of the g.s. and 1130,0+ state in 100Ru. The absolute energy of the isomer in 100Nb is now well established from recent Penning-trap mass measurements. Excited state data are nonexistent for 100Kr, 100Rb and 100Sn; and only one excited state is known in 100In. Except for isotopic identification, no information is available for the decay of the 100Kr isotope and very little is known about the decay properties of the 100Sn isotope. In the case of 100Pd, there are many recent studies of high-spin structures but the agreement in the orderings of the γ-ray cascades and γ-ray inventory between various studies remains poor at high (>9 MeV) excitation energies. The energy difference between the g.s. an isomer in 100Y has recently been precisely measured in Penning-Penning-trap mass measurements, however, the assignments of the two previously known half-lives and Jπ's to the respective states (g.s. and the 145-keV isomer) in 100Y remains to be established. Static moments in 100Y have also been recently measured for one of these states in 100Y but it is not definitely known as to which of the two states (g.s. or the isomer) is connected with these measurements. This work supersedes earlier full evaluations of A = 100 by 1997Si09, 1990Si05 and 1974Ko37.