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A natural silicon target was investigated in a    $$^{\text {nat}}$$natSi(   $$\mathbf {\gamma },\gamma ^{\prime }$$    γ  ,   γ  ′) photon-scattering experiment with fully linearly-polarised, quasi-monochromatic    $$\mathbf {\gamma }$$   γrays in the entrance channel. The mean photon energies used were    $$\langle {E}_{\gamma }\rangle =$$    ⟨   E  γ   ⟩  =9.33, 9.77, 10.17, 10.55, 10.93, and 11.37 MeV, and the relative energy spread (full width at half maximum) of the incident beam was    $$\varDelta E_{\gamma }/\langle {E}_{\gamma }\rangle \approx $$    Δ   E  γ   /   ⟨   E  γ   ⟩   ≈3.5–4 %. The observed angular distributions for the ground-state decay allow firm spin and parity assignments for several levels of the stable even-even silicon isotopes.

Firm spin and parity assignments for high-lying, low-spin levels in stable Si isotopes