Observation of the Electrofission ofSi28

Abstract

A peak in the yield from the electron-induced fission of ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ has been observed at an excitation energy of 28.3 MeV, decaying by the channel ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(g.s.) + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}_{}^{2+}{}_{}{}^{}$ (4.43 MeV). The angular distribution of the carbon nuclei from this feature follows ($1-{{cos}^4\theta }_{\mathrm{c}.\mathrm{}\mathrm{ }\mathrm{m}.\mathrm{}}$) indicating an assignment of $J=2\mathrm{}$ with a projection along the fission axis of $K=2\mathrm{}\hslash$. The observed peak could be due to excitations of the giant quadrupole resonance in the prolate well of ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$.