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The single-neutron excitation was studied for the first time via the $^{206}$Hg(d,p) reaction in inverse kinematics using a $^{206}$Hg beam. The beam was produced at the CERN’s ISOLDE facility at an energy of 7.4 MeV/u. The energy and position of protons emitted at backwards angles were measured using the new ISOLDE Solenoidal Spectrometer (ISS) at a magnetic field strength of 2.5 T. The energy resolution is ~140 keV. Angular distributions suggest that the 0g$_{9/2}$, 2d$_{5/2}, 3s${1/2}$, 2d${3/2}$ and 0g$_{7/2} orbitals were observed in $^{207}$Hg. The result improves the understanding of the r-process and the synthesis of heavy nuclei.
This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract Number DE-AC02-06CH11357 (ANL), the UK Science and Technology Facilities Council [Grants No. ST/P004598/1, No. ST/N002563/1, No. ST/M00161X/1 (Liverpool); No. ST/P004423/1 (Manchester); No. ST/P005314/1 (Surrey); No. ST/P005101/1 (West of Scotland); the ISOL-SRS Grant (Daresbury)], the European Union’s Horizon 2020 Framework research and innovation program under Grant Agreement No. 654002 (European Nuclear Science and Applications Research) and the Marie Skłodowska-Curie Grant Agreement No. 665779, and from the Research Foundation Flanders (Belgium) under the Big Science project G0C28.13, and the European Research Council (ERC) under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement No. 617156. M. R. M. was supported by the U.S. Department of Energy through the Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, Limited Liability Company, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001). S. V. S. was supported by the Academy of Finland (Grant No. 307685). M. R. M. was also supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under Project No. 20190021DR.
