Gamma-Gamma Directional Correlations in ${Pm}^{149}$

The directional correlations of six

γ - γ

cascades in

{Pm}^{149}

from the decay of

{Nd}^{149}

have been studied. The results are as follows:

W (θ_{440 - 210}) = 1 - (0.026 \pm 0.011) P_{2} (cos θ) + (0.033 \pm 0.018) P_{4} (cos θ),

W (θ_{536 - 114}) = 1 + (0.042 \pm 0.006) P_{2} (cos θ) - (0.009 \pm 0.010) P_{4} (cos θ),

W (θ_{328 - 210}) = 1 + (0.109 \pm 0.006) P_{2} (cos θ) - (0.020 \pm 0.010) P_{4} (cos θ),

W (θ_{424 - 114}) = 1 - (0.102 \pm 0.006) P_{2} (cos θ) - (0.027 \pm 0.010) P_{4} (cos θ),

W (θ_{266 - 272}) = 1 - (0.227 \pm 0.008) P_{2} (cos θ) + (0.013 \pm 0.013) P_{4} (cos θ),

W (θ_{158 - 114}) = 1 + (0.074 \pm 0.026) P_{2} (cos θ) + (0.026 \pm 0.040) P_{4} (cos θ) .

From the measured spin of the ground state of

{Pm}^{149}

\frac{7}{2}

the excited states of

{Pm}^{149}

are assigned spins as follows: 114 keV,

\frac{5}{2}

; 210 keV,

\frac{5}{2}

(

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Gamma-Gamma Directional Correlations inPm149