THE LOW LEVELS OF Si²⁹

Abstract

Information on the low levels in Si 29 has been obtained by studying the gamma radiation associated with the Si 29 (p, p′γ)Si 29 inelastic-scattering reaction in the proton-energy range from 2.5 to 3.0 Mev. and with the Al 29 (β − )Si 29 negatron decay. Angular-distribution measurements have shown that the 2.03 Mev. level in Si 29 has spin 5/2, and are consistent with a 3/2 assignment to the 1.28 Mev. level. The E2/M1E2 branching ratio for the de-excitation of the 2.03 Mev. state has been measured to be approximately 100. Log ft values of < 5.2, > 6.5, and 5.2 have been determined for the branches of the Al 29 decay to the 2.43, 2.03, and 1.28 Mev. states in Si 29 .