SPIN OF 1029-KEV LEVEL IN 200HG

The spin of the 1,029 keV level in200Hg has been determined to be 0 through measurements of the γ-γ-angular correlation of the 661 keV and 368 keV γ-rays following slow neutron capture in199Hg. The upper limit for the γ-intensity ratio Iγ(1,029 keV)/Iγ(661 keV) obtained from the curved crystal spectrometer (n, γ)-data is much lower than the ratio found during the200Tl→200Hg decay studies. This implies that the 1,029 keV γ-line seen in the decay work does not lead from the 1,029 keV level to the ground state in200Hg, but that it depopulates a level which is only weakly fed through the (n, γ)-process. © 1969 Springer-Verlag.