Abstract
The neutron-rich nucleus has been studied at the RIKEN Radioactive Isotope Beam Factory using in-beam -ray spectroscopy with two-proton removal reactions from . A -ray transition was observed at 618(8) keV and was assigned to the decay. The state provides the first spectroscopic information from the even-even nuclei located in the region “southeast” of the doubly magic nucleus . By comparing with the excitation energies in the semimagic nuclei and , it is found that neutron excitations dominate the state in , in a similar manner to . The results are discussed in terms of proton-neutron configuration mixing.
- Received 8 July 2016
DOI:https://doi.org/10.1103/PhysRevC.94.051301
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