Skip to Main content Skip to Navigation

# 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.
Document type :
Journal articles
Complete list of metadata

http://hal.in2p3.fr/in2p3-01346025
Contributor : Michel Lion <>
Submitted on : Monday, July 18, 2016 - 11:12:49 AM
Last modification on : Tuesday, May 11, 2021 - 11:36:49 AM

### Citation

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⟩

Record views