Abstract
The level structure of the 87-neutron nucleus151Gd has been investigated by studying the EC- andβ +-decay of151Tb. Gamma-ray and conversion electron spectra as well as gamma-gamma coincidence spectra were measured by using semiconductor spectrometers and a high-capacity two-parameter recording system. The proposed decay scheme contains several new energy levels in151Gd, among them a 5−/2 state at 427 keV. To explain the low-energy level structure, a small stable deformation is assumed for151Gd. Using a single-particle-plus-rotor model based on a generalized Woods-Saxon potential, complete mixing of the shells 1h 9/2, 2f 7/2 and separately 1i 13/2 is observed. By these mixings the correct level order and approximately correct excitation energies up to 1 MeV are reproduced.
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We wish to thank A. Fontell and P. Jartti for careful mass and chemical separations as well as T. Liljavirta for valuable technical assistance. Dr. S. Wahlborn has kindly made available his computer programs, which have been modified for our calculations. In the calculations R. Katajanheimo's help has been of great value. One of us (T. T.) is indebted to the Emil Aaltonen Foundation for financial support.
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Hammarén, E., Puhakka, P., Siivola, A. et al. Low-spin states in151Gd. Z Physik A 272, 341–349 (1975). https://doi.org/10.1007/BF01440859
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DOI: https://doi.org/10.1007/BF01440859