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Abstract: (APS)
The new member of the 2.97-MeV doublet in F20 has a dominant γ decay to a (3−) state at 1971 keV, further evidence that the new state has Jπ=(4−). The excitation energy is 2968.0±1.5 keV. NUCLEAR REACTION B11(C13, αγ), E=18.5 MeV; measured Eα, Eγ, αγ coincidences. F20 deduced levels, gamma branchings, J, π.