Approaching complete low-spin spectroscopy ofBi210with a cold-neutron capture reaction

Reduction in the uncertainty of the neutron-capture cross section of 210Bi: Impact of a precise multipolarity measurement of the 2− → 1− main ground-state transition

“…Based on the present data, the decay scheme of 210 Bi from the capture state (at 4605.2(1) keV) was established [6]. A large number of paths was found: 64 primary γ rays were identified, including 40 newly found branches.…”

Multipolarity of the2−→1−, ground-state transition inBi210via multivariable angular correlation analysis

“…Moreover, we note that in the following analysis the primary γ rays 2505 and 3081 keV are assumed to be 5 − → 5 (+) and 5 − → 4 (+) transitions, respectively, as assigned in Ref. [8]. However, since at least two states having spin-parity values 4 − or 5 − can contribute to the capture level populated in the 209 Bi(n,γ ) 210 Bi reaction (see Fig.…”

“…According to Ref. [2], when one assumes the following mixing values-pure M1, 50% M1 + 50% E2, or pure E2-the final neutron-capture cross section to the ground state results in 21.5(9), 19.3 (8), and 17.2(7) mb, respectively [2].…”

“…Based on the data collected in this experiment, the decay scheme of 210 Bi from the capture states was established and the angular correlations of the strongest γ rays were used to assign spins and parities of several populated levels. The latter analysis was performed making use of three γ γ -coincidence matrices constructed for the angles 0, 45, and 90 • between the EXOGAM detectors [8]. In the following we describe the angular correlation analysis, focusing on the 320-keV transition in 210 Bi.…”

“…The arrows in the middle schematically represent the remaining part of the γ decay flux from the capture states. The full level scheme of 210 Bi from the present data is reported in Ref [8]…”