Abstract
A seven-detector γ-γ angular-correlation apparatus has been constructed to study short-lived fission product nuclei produced by the TRISTAN on-line isotope separator system. The apparatus employs either seven NaI(Tl) detectors or six NaI(Tl) detectors and one Ge(Li) detector. A 16 384-channel analyzer may be used in conjunction with a series of single-channel discriminators to measure correlations simultaneously on all cascades involving a single γ-ray transition. Alternatively, a buffer tape system may be used to record data simultaneously on all cascades in a decay scheme. The apparatus has been tested on cascades in 138Ba from the decay of 138Cs. The results for three direct and two skip cascades are consistent with the known spins of 2 +, 4 +, 4 +, and 3 + for the levels at 1436, 1899, 2308, and 2446 keV in 138Ba, respectively. In addition mixing ratios of 0.01±0.03, 0.05 −0.12 +0.20, and 0.10±0.03 have been obtained for the transitions at 1009, 409, and 547 keV in this nucleus.
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