Abstract
Directional-correlation measurements of several cascades in the74As decay have been made with a NaI — Ge(Li) detectors system. In the74Ge the following cascades were measured: 608–596 keV, 994–1,204 keV, 994-(608)-596 keV and 887-596 keV. The corresponding results give a unique spin assignment of 2 for the 2,198 keV level and determine theE2/M 1 mixing ratios ofδ(608)=3.4±0.4 andδ(994)=−(2.8 ± 0.2). In the74Se it was measured the 635-635 keV cascade. The result obtained assigned the spin of the 1,270 keV level as 2 and fixed the E2/M1 mixing ratio of δ(635)=−(2.6 ± 0.2). Also aγ-intensity study has been made to determine the branching ratios of the transitions that deexcite the 1,270 keV level in74Se. From these data aI(635)/I(1,270)=12.5 ± 5.0 is obtained.
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