Abstract
The yrast level structure of Rn has been studied by means of in-beam spectroscopy -- coincidence techniques through the Pb(O,2) reaction at 93 MeV bombarding energy, using the 8 GASP-ISIS spectrometer at Legnaro. New spectroscopic information has been obtained. The deduced low-lying level scheme of Rn does not exhibit the alternating parity structure observed in the heavier known isotones Fr, Ra, Ac, and Th. From this result, the lightest nucleus showing evidence for octupole collectivity is Fr, defining the lowest-mass corner for this kind of phenomenon as and .
- Received 29 July 2011
DOI:https://doi.org/10.1103/PhysRevC.86.014326
©2012 American Physical Society