Multipolarity of the 2− → 1−, ground-state transition in $^{210}$Bi via multivariable angular correlation analysis

Abstract : The multipolarity of the main transition leading to the ground state in 210Bi was investigated using the angular correlations of γ rays. The analyzed γ -coincidence data were obtained from the 209Bi(n,γ )210Bi experiment performed at Institut Laue-Langevin Grenoble at the PF1B cold-neutron facility. The EXILL (EXOGAM at the ILL) multidetector array, consisting of 16 high-purity germanium detectors, was used to detect γ transitions. The mixing ratio of the 320-keV γ ray was defined by minimizing a multivariable χ2 function constructed from the coefficients of angular correlation functions for seven pairs of strong transitions in 210Bi. As a result, the almost pure M1 multipolarity of the 320-keV γ ray was obtained, with an E2 admixture of less than 0.6% only (95% confidence limit). Based on this multipolarity the neutron-capture cross section leading to the ground state in 210Bi, that decays in turn to radiotoxic 210Po, was determined to be within the limits 21.3(9) and 21.5(9) mb. This result is important for nuclear reactor applications.
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Physical Review C, American Physical Society, 2016, 94 (1), pp.014311. 〈10.1103/PhysRevC.94.014311〉
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Contributeur : Michel Lion <>
Soumis le : lundi 18 juillet 2016 - 11:12:49
Dernière modification le : mardi 22 mai 2018 - 21:48:11

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N. Cieplicka-Oryńczak, B. Szpak, S. Leoni, B. Fornal, D. Bazzacco, et al.. Multipolarity of the 2− → 1−, ground-state transition in $^{210}$Bi via multivariable angular correlation analysis. Physical Review C, American Physical Society, 2016, 94 (1), pp.014311. 〈10.1103/PhysRevC.94.014311〉. 〈in2p3-01346025〉

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