The 2506–2159 keV transition in 60Ni following beta decay of 60Co

A Ge(Li)–NaI(Tl) coincidence arrangement has been used to verify the presence of a 347 keV γ ray following the beta decay of 60Co. This γ ray is identified as the 2506 → 2159 keV transition in 60Ni. The intensity was measured to be (6.9 ± 1.0) × 10−5 per beta disintegration of 60Co. An upper limit of 1.2 × 10−5 per beta disintegration (95% confidence limit) was obtained for the 2626 → 2159 keV transition in 60Ni.

Gamma Ray Intensity and Angular Correlation Measurements in 160Dy

Gamma-ray intensity measurements in 160Dy have been carried out using a Ge(Li) detector. In addition, 1'-1' angular correlation measurements have been made on 10 cascades in 160Dy using a Ge(Li)-NaI(TI) fast coincidence arrangement. These cascades are 299 ..... 966, 299 ..... 879, 879 ..... 87, 197 ..... 87, 962 ..... 87, 21S ..... 962, 299 ..... (879) ..... 87, 299 ..... (682) ..... 197, 21S ..... (962) ..... 87 and 21S ..... (76S) ..... 197 keY. Of these, the 21S ..... (962) ..... 87 and 21S ..... (76S) ..... 197 keY cascades have been measured for the first time. The multipolarities of the 197, 21S, 299, 879 and 962 keY transitions were found to be E2+(0'2�0'2)%M3, El +(2'S~~:g)%M2, El +(2~~)%M2, Ml +(99�1)%E2 and Ml + (98 � 1) % E2 respectively.

Levels in 89Rb Populated by the Beta Decay of 89Kr

The decay of 3.2 min 89Kr has been investigated with small and large volume Ge(Li) detectors used singly and in a dual parameter coincidence arrangement. A total of 162 gamma rays are identified with the decay of this isotope, 120 of which are placed in a level scheme on the basis of gamma–gamma coincidence evidence and the energy differences between established levels. Levels at 220.9, 497.7, 577.3, 586.1, 930.7, 931.5, 997.6, 1195.5, 1324.6, 1530.1, 1533.6, 1694.1, 1822.1, 1998.9, 2160.5, 2401.5, 2598.5, 2867.2, 3099.7, 3329.9, 3363.1, 3372.1, 3534.1, 3719.3, 4145.1, 4217.4, 4340.9, and 4487.5 keV are well established by coincidence data and many energy sums. The levels proposed at 2783.4, 3429.7, 3456.6, 3978.4, 4058.4, and 4406.5 keV are less securely established. The most probable spins of the ground state and the first two excited states arc 3/2−. 5/2− and 1/2− respectively. Improved energies and intensities of the gamma rays from the decay of 15 min 89Rb have also been determined.

Levels in 143Pr populated in the decay of 143Ce

Experiments using Ge(Li) and Nal(Tl) detectors singly and in a 2-parameter coincidence arrangement have been carried out to establish the role of a number of weak transitions in the decay of 143Ce. Twenty-six of the twenty-seven observed γ rays have been placed in a decay scheme with levels at 57.4, 350.6, 490.2, 721.8, 739.9, 847.9, 937.3, 1059.8, (1156.5), 1160.1, 1381.6, and 1397.4 keV. The K-conversion coefficients of the 293 and 350 keV transitions, measured with a Si(Li) detector, are 0.10 ± 02 and 0.024 ± 0.03 respectively.