Determination of the Mixing Ratio in the Decay of the Long — Lived 1.612 MeV Level in ³⁷ Ar

Abstract

Rosner and Schneid¹) have shown that the ³⁶Ar (d, p) ³⁷Ar reaction populates the 1.612 MeV level in ³⁷Arvia l_n = 3 stripping. This measurement implies a spin and parity of J^π = 5/2⁻ or 7/2⁻ for this level. They assigned J^π = 7/2⁻ using shell-model arguments. Goosman and Kavanagh²) have measured the mean lifetime of this level to be τ = 5.15 ± 0.7 ns, using a recoil — Doppler — shift method. They concluded that the 1.612 MeV level has J^π = 7/2⁻ on the basis of transition probability arguments. In this paper, we report on the determination of the mixing ratio of the gamma — ray transition from the 1.612 MeV level to the 3/2⁺ ground state of ³⁷Ar.