The structure of the N≃28 45,4618 Ar27,28 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.
- Large-scale shell model calculations
- Nuclear reactionsBe(Ca, X) Ar/ Ar, E = 60 MeV/nucleon; measured Eγ, Iγ, γγ, (particle)γ-coin, deduced levels, J, π, T
- Spectrometer, Ge and BaF detectors
ASJC Scopus subject areas
- Nuclear and High Energy Physics