1. In-beam $\gamma-$spectroscopy of the transitional nucleus $^{217}$Ac
- Author
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Sahoo, Dhananjaya, Deo, A. Y., Madhu, Yadav, Khamosh, Tiwary, S. S., Srivastava, P. C., Palit, R., Tandel, S. K., Kumar, Anil, Dey, P., Das, Biswajit, Malik, Vishal, Kundu, A., Sindhu, A., Jadhav, S. V., Naidu, B. S., and Thomas, A. V.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
High-spin states in the transitional $^{217}$Ac nucleus are established up to 3.8 MeV excitation energy and $I^{\pi} =$ 41/2$^+$ with the addition of around 20 new transitions. The structure of the yrast and near-yrast states below the 29/2$^+$ isomer is revisited. The inconsistencies in the level schemes reported earlier are resolved. The level structure above the 29/2$^+$ isomer is established for the first time. Large-basis shell-model calculations with the KHPE interaction are performed to compare the experimentally observed level energies with the theoretical predictions. A comparison with the systematics of the N = 128 isotones suggests that the yrast structures result from a weak coupling of the odd proton to the even-even 216Ra core, which is consistent with the shell-model configurations. Furthermore, alpha decay of the 29/2$^+$ isomer is revisited and the decay scheme established from this work is discussed in the framework of the shell model., Comment: 11 pages, 9 figures
- Published
- 2024