The yrast level structure of Rn-215,Rn-216 has been studied using in beam spectroscopy alpha - gamma - gamma coincidence techniques mainly through the Pb-207(O-18, 2 alpha 2n) and Pb-208(O-18, 2 alpha 2n) reactions in the 91-93 MeV energy range, using the 8 pi GASP-ISIS spectrometer at Legnaro. The obtained low lying level scheme of Rn-215 does not exhibit the alternating parity structure observed in their heavier known isotones Fr-216, Ra-217 and Ac-218. The level scheme of Rn-216 resulting from this study shows >From this result, the lightest nucleus showing evidence for reflection asymmetry is Fr-216 defining one lowest-mass corner for this kind of phenomenon as N >= 129 and Z >= 87.
Spectroscopy of Rn-215(86)
LENZI, SILVIA MONICA;
2007
Abstract
The yrast level structure of Rn-215,Rn-216 has been studied using in beam spectroscopy alpha - gamma - gamma coincidence techniques mainly through the Pb-207(O-18, 2 alpha 2n) and Pb-208(O-18, 2 alpha 2n) reactions in the 91-93 MeV energy range, using the 8 pi GASP-ISIS spectrometer at Legnaro. The obtained low lying level scheme of Rn-215 does not exhibit the alternating parity structure observed in their heavier known isotones Fr-216, Ra-217 and Ac-218. The level scheme of Rn-216 resulting from this study shows >From this result, the lightest nucleus showing evidence for reflection asymmetry is Fr-216 defining one lowest-mass corner for this kind of phenomenon as N >= 129 and Z >= 87.Pubblicazioni consigliate
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