Neutron and Gamma Widths of aJ=32−Doorway State inSi29

Abstract

The recent experimental evidence for a $J={\frac{3}{2}}^{-}$ doorway state common to the ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}+n$ and ${}_{}{}^{29}{}_{}{}^{}\mathrm{Si}+\gamma$ channels near 750 keV is found to be supported by a doorway-type calculation, which reproduces neutron and $\gamma$ widths, as well as the $p_{\frac{3}{2}}$ low-lying spectroscopic strength. The limitations of valence-model calculations reported in literature for ${}_{}{}^{29}{}_{}{}^{}\mathrm{Si}$ is discussed.