Energy levels of excited in the decay of the isomeric pair and

Abstract

The γ-ray spectra accompanying the decay of 96gTc (4.3 d) and 96mTc (52 m), produced in the reactions 96Mo (p, n) 96Tc and 97Mo (p, 2n) 96Tc, have been studied with lithium-drifted Ge detectors.Gamma rays (relative intensities are in parentheses) of 314.2 ± 0.2 (2.4), 316.3 ± 0.2 (1.5), 434.8 ± 0.4 (0.8), 460.2 ± 0.4 (0.48), 568.9 ± 0.4 (.95), 778.2 ± 0.2 (100), 812.5 ± 0.2 (83), 849.8 ± 0.2 (98), 1091.3 ± 0.4(0.9), 1126.8 ± 0.3 (15.3), 1200.0 ± 0.4 (0.41), and 1497.7 ± 0.5 keV (0.081), plus several other very weak lines, have been observed in the decay of 96Tc (4.3 d). Several transitions never previously reported were found in the decay of 96mTc (52 m). All but four of these transitions could fit already known excited levels in 96Mo at 778.2, 1497.9, 1628.0, 1869.6, and 1978.3 keV, whereas the placing of the remaining 616.1-, 966.6-, 1096.6-, and 1816.2-keV gamma rays required the existence of a new level in 96Mo at 2594.5 keV.In view of the results obtained from the study of the decay of the 96Tc isomeric pair, it was considered very desirable to reinvestigate the decay of 96Nb to levels in 96Mo. The 96Nb source was produced in the reaction 96Zr (p, n) 96Nb. Ge(Li) detectors were again employed and gamma–gamma directional correlation measurements were performed with two NaI(Tl) crystals, a fast coincidence circuit, and a multiparameter analyzer to record the data.The experimental directional correlation coefficients of the 1200.1–778.2, 1200.1–460.1, 778.2–460.1, 1091.4–778.2, 1091.4–568.7, and 778.2–568.7 keV cascades are[Formula: see text]respectively.These values seem to be compatible with spin assignments of 4+, 3+, and 5+ for the 1869.6-, 1978.3-, and 2438.4-keV levels in 96Mo respectively.