Abstract
The main goal of this work is the determination of spins and parities of excited states in , among others the 2264.3-keV level, which had previously been tentatively reported as the excitation corresponding to the neutron orbital. Low-spin excited states in were populated via the cold-neutron capture reaction. The rays emitted following the reaction were measured using the highly efficient array of high-purity germanium detectors, EXILL, at the Institut-Laue-Langevin (ILL), Grenoble. The primary rays deexciting the capture state in were identified for the first time. The new, precise neutron binding energy in of 5569.15(4) keV differs significantly from the value reported in the literature. The previously reported level scheme has been amended by several new low-spin levels. The () data were complemented by a measurement of the decay of at the Lohengrin fission-fragment separator of the ILL, and the observation of the decay of populated in neutron-induced fission of and measured using the EXILL Ge array. The combined data allowed unique spin-parity assignments for many levels in . The 2264.3-keV level, with a new spin-parity assignment of , may correspond to the extruder orbital.
9 More- Received 30 September 2018
DOI:https://doi.org/10.1103/PhysRevC.98.064315
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