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Radiochimica Acta similar to the energies corresponding to the first two excited levels in even-mass isotones of Ν = 80. The energy levels of the isotone nuclei 13e Ba [23], 138 Ce [23], and 140 Nd [24] are shown in Fig. 6. Acknowledgement We would like to thank our colleagues for clarifying discussions and the crew of the Cyclotron for performing the irradiations. One of the authors (H.P.M.) thanks the South African Council for Scientific and Industrial Research for financial support in the form of a research fellowship. 23. Nuclear Data Sheets NAS, NRC 61-2-122, NRC 61-3-77. 24. V. V. REMAEV, Y. T. GRITSYNA and A. P. KLYUCHAREV, Soviet Phys. JETP 15, 283 (1962). Summary

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