Spectroscopy of high-spin states in 211,212,213Fr |
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| Institution: | 1. Department of Physics, Al Azhar University, Cairo, 11651, Egypt;2. Department of Mathematics, Bergische Universität, Wuppertal, 42097, Germany;3. The Computation-Based Science Research Center, The Cyprus Institute, Nicosia, 2121, Cyprus;4. Department of Physics, University of Ferrara, Ferrara, 44121, Italy;5. Department of Physics, Al Azhar University, Cairo, 11651 (Girls branch), Egypt;1. Institute for Nuclear Research, Prospect Nauki 47, 03028 Kiev, Ukraine;2. Faculty of Physics, Taras Shevchenko National University of Kiev, Prospect Glushkova 2, 03022 Kiev, Ukraine;3. Ukrainian State University of Chemical Technology, Prospect Gagarina 8, 49005 Dnepr (Dnepropetrovsk), Ukraine;4. Department of Mathematics, Financial University, Leningradsky Prospect 49, 125993 Moscow, Russia;1. Department of Physics and Astronomical Sciences, Central University of Jammu, Jammu-181143, J&K, India;2. Department of Physics and Electronics, University of Jammu, Jammu-180006, J&K, India;3. Cluster University of Srinagar, Srinagar-190001, J&K, India |
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| Abstract: | The level structures of 211Fr, 212Fr and 213Fr have been observed to high spins, ~ 28 /kh, (and excitation energies ~ 8 MeV) using a variety of γ-ray spectroscopic techniques. The structure of these nuclides is discussed in terms of couplings of single-particle states through empirical shell-model calculations. Good agreement with experiment is obtained. In 212Fr and 213Fr core-excited configurations are required to explain the properties of the highest states. A number of long-lived states were observed in each nucleus some of which decay by enhanced E3 transitions. The E3 transition strengths are discussed. |
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