The yrast level structure of 216Rn has been studied using in-beam spectroscopy α-γ-γ coincidence techniques through the 208Pb(18O, 2α2n) reaction in the 91–93 MeV energy range, using the 8π GASP-ISIS spectrometer at Legnaro. The level scheme of 216Rn resulting from this study shows alternating parity bands only above a certain excitation energy. From this result, the lightest nucleus showing evidence of octupole collectivity at low spins is still 216Fr, thereby defining the lowest-mass corner for this kind of phenomenon as N≥129 and Z≥87.
High-spin octupole yrast levels in 216Rn86
LENZI, SILVIA MONICA;LUNARDI, SANTO;
2006
Abstract
The yrast level structure of 216Rn has been studied using in-beam spectroscopy α-γ-γ coincidence techniques through the 208Pb(18O, 2α2n) reaction in the 91–93 MeV energy range, using the 8π GASP-ISIS spectrometer at Legnaro. The level scheme of 216Rn resulting from this study shows alternating parity bands only above a certain excitation energy. From this result, the lightest nucleus showing evidence of octupole collectivity at low spins is still 216Fr, thereby defining the lowest-mass corner for this kind of phenomenon as N≥129 and Z≥87.
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