Elsevier

Nuclear Data Sheets

Volume 8, Issue 6, December 1972, Pages 527-598
Nuclear Data Sheets

Nuclear data sheets for A = 93

https://doi.org/10.1016/S0090-3752(72)80032-2Get rights and content

Abstract

The 1960 version of the Nuclear Data Sheets for A = 93 has been revised on the basis of experimental data received prior to November 1, 1972. Information from approximately 180 papers and communications has been included in the present evaluation.

Nine nuclei are known for A = 93. Only the presumed ground states and their half-lives have been established for 93Kr, 93Rb, and 93Sr, and only fragmentary information on their decay schemes is available. The Q-Value for 93Sr decay is not well determined experimentally. Decay studies and pick-up reactions have established a few low-lying levels in 93Y. Many spin assignments have been made for levels in 93Zr on the basis of decay studies, transfer reactions, and measurements on isobaric analog resonances in 93Nb. The decay schemes of long-lived 93Zr and 93Mo are still somewhat uncertain, since the existence of a decay on the 93Nb ground state is not well established for either nucleus. Furthermore, the half-life of 93Mo has not been directly measured. Low-lying levels in stable 93Nb have been extensively studied via β-decay, Coulomb excitation, neutron inelastic scattering and transfer reactions, and an appreciable number of spin assignments are firm. Extensive β-decay, γ-decay, transfer and charge-exchange reaction, and isobaric analog resonance measurements have led to many spin assignments for levels in 93Mo. The nucleus 93Tc has been studied via γ-decay and transfer reactions, but few spin assignments are firm. Recent measurements indicate the existence of two levels in 93Ru with approximately the same half-life, but the ordering of the levels and their decay properties is not well established.

The well-established MA γ-decays of the first-excited states of 93Nb and 93Tc are found to have large enhancements of 13.2 and 26.7, respectively, the latter being the largest M4 enhancement known. The electron-capture decay of the first-excited state of 91Tc also is found to have an unusually low log ft of 4.2.

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  • Cited by (47)

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    Nuclear Information Research Associate. Work supported by the National Science Foundation through the National Academy of Sciences — National Research Council, Committee on Nuclear Science

    *

    Operated by Union Carbide Corporation for the U.S. Atomic Energy Commission

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