Investigation of the 29Si(n, γ)30Si reaction with non-polarized and polarized thermal neutrons

The γ-radiation following capture of non-polarized as well as polarized thermal neutrons in ²⁹Si has been investigated. All but one of the 56 γ-rays ascribed to the ²⁹Si(n, γ) reaction could be placed into a ³⁰Si decay scheme. The excitation energies of 21 bound states, three of which have not been reported previously, have been determined with 0.14 ± 0.8 keV errors. The spin and parity of the E_x = 8.16 MeV level have been determined as 1^?. The thermal-neutron capture cross sections of ²⁸Si and ²⁹Si are 160 ± 18 mb and 101 ± 14 mb, respectively. The (n, γ) reduced primary transition probabilities are strongly correlated with the (d, p) spectroscopic factors for l_n(d, p) = 1 levels. A simple shell-model calculation supports the experimentally founded assumption that, in addition to the E_x = 8.16 MeV level, there are one or more other levels with J^π = 1^? and with rather large relative $\text{2}\text{s}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}\text{2}\text{p}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}$ strength.