Abstract
The structure of the N≃28 45,46 18Ar 27,28 nuclei has been investigated through in-beam γ-ray spectroscopy using the fragmentation reaction of a 60 A MeV 48Ca beam on a thin Be target. γ-ray energies, intensities, γγ coincidences and γ-ray angular anisotropies have been measured. The level scheme of 45Ar is proposed for the first time, while that of 46Ar has been extended to states above the previously known 2 + first excited state. An isomeric state at 537 keV of 0.34 +0.32 −0.15 ns lifetime has been found in 45Ar from the line-shape analysis of the γ ray connecting the first excited state to the ground state. The experimental results are interpreted using shell-model calculations.
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