1. Influence of octupole vibration on the low-lying structure of 251Fm and other heavy N=151 isotones.
- Author
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Rezynkina, K., Lopez-Martens, A., Hauschild, K., Deloncle, I., Péru, S., Brionnet, P., Chelnokov, M. L., Chepigin, V. I., Dorvaux, O., Déchery, F., Faure, H., Gall, B., Isaev, A. V., Izosimov, I. N., Katrasev, D. E., Kuznetsov, A. N., Kuznetsova, A. A., Malyshev, O. N., Popeko, A. G., and Popov, Y. A.
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EXCITED state energies , *ALPHA decay , *ELECTRON spectroscopy - Abstract
The structure of low-lying excited states in 251Fm, populated by the α decay of 255No, has been investigated by means of combined γ and internal conversion electron spectroscopy. The values for the internal conversion coefficients for the 1/2+→5/2+ and 5/2+→9/2- transitions have been measured. The determined M2/E3 mixing ratio and lifetime for the 5/2+ decay to the ground state allowed to determine the corresponding reduced transitions strengths of B(E3)=18(6) W.u. and B(M2)=3.0(6)×10-3 W.u. These results, as well as the results of previous studies in N=151 isotopes, are compared to theoretical calculations beyond the mean-field approach, including the first QRPA calculations using the Gogny D1M parametrization for such heavy odd-N nuclei. The comparison points to the importance of accounting for the octupole vibrations for a proper understanding of the low-lying nuclear structure of some of the heaviest elements. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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