Abstract
The level structure of the neutron-rich nucleus is investigated through -delayed -ray spectroscopy at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. Ions of are produced by in-flight fission, separated and identified in the BigRIPS fragment separator, and implanted in the WAS3ABi silicon detector array, surrounded by Ge cluster detectors of the EURICA array. A large number of excited states in are identified for the first time by correlating rays with the decay of , and a level scheme is constructed by utilizing their coincidence relationships. The good agreement between large-scale Monte Carlo shell model calculations and experimental results allows for the evaluation of the single-particle structure near and suggests a single-particle nature for both the and states in , leading to doubly magic .
- Received 17 January 2017
DOI:https://doi.org/10.1103/PhysRevLett.118.242502
© 2017 American Physical Society