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The experiment was performed at the PF1B cold-neutron facility at the Institut Laue-Langevin in Grenoble (France)International audienceThe low-spin structure of the 210Bi nucleus was investigated in the neutron capture experiment 209Bi(n,γ )210Biperformed at ILL Grenoble at the PF1B cold-neutron facility. By using the EXILL multidetector array, consistingof 46 high-purity germanium crystals, and γγ-coincidence technique, 64 primary γ rays were observed (40new) and a total number of 70 discrete states (33 new) were located below the neutron binding energy in 210Bi.The analysis of the angular correlations of γ rays provided information about transitions multipolarities, whichmade it possible to confirm most of the previously known spin-parity assignments and helped establish new ones.The obtained experimental results were compared to shell-model calculations involving one-valence-proton,one-valence-neutron excitations outside the 208Pb core. It has been found that while up to the energy of ∼2 MeVeach state observed in 210Bi has its calculated counterpart; at higher excitation energies some levels cannot bedescribed by the valence particle couplings. These states may arise from couplings of valence particles to the 3−octupole phonon of the doubly magic 208Pb core and may serve as a testing ground for models which describesingle particle-phonon excitations

physical review. c

Approaching complete low-spin spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Bi</mml:mi><mml:mprescripts /><mml:none /><mml:mn>210</mml:mn></mml:mmultiscripts></mml:math>with a cold-neutron capture reaction

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