Elsevier

Nuclear Physics A

Volume 510, Issue 2, 9 April 1990, Pages 189-208
Nuclear Physics A

The beta decay of 9Li to levels in 9Be: A new look

https://doi.org/10.1016/0375-9474(90)90236-FGet rights and content

Abstract

Beta-delayed neutrons and alpha particles from the decay of 9Li have been studied with a 3He neutron spectrometer and silicon surface barrier detectors. The data show that the (50 ± 3)% feeding to particle unbound states mainly proceeds to the four excited states in 9Be at 2.43 MeV (30 ± 3)%, 2.78 MeV (16 ± 3)%, and 11.28 and 11.81 MeV (3.8 ± 0.2)%. The strong feeding to the 11.81 MeV state observed corresponds to a log ft value of 2.84. The beta-decay rates are strongly affected by the broad levels populated in the decay. Corrections involving R-matrix calculations have been applied for the extraction of the reduced transition probabilities. We confirm the recently determined strong asymmetry in the beta decays of the case32 ground states of 9C and 9Li to the excited case52 states in the daughters 9B and 9Be.

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    Supported by the Bundesministerium für Forschung und Technologie of the Federal Republic of Germany under the contract number 06DA454.

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