Tenoscopic anatomy of the equine carpal extensor tendon sheaths

The structure of the N≃28 ^45,46 ₁₈ Ar _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.