Abstract
A new measurement of the β-decay of 9Li has clarified the feeding to the highest accessible states in 9Be. It is found that the β-decay mainly populates the 11.8 MeV state, whose spin is determined as 5/2−. The extracted BGT value of 5.3(0.9) is a factor 4.4(1.0) larger than that of the mirror transition from 9C. A theoretical explanation of such a pronounced β-decay asymmetry is presently lacking.
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