Observation of α decay from a state in 10B at 11.48 MeV

We report on the observation of α decay from a state in 10B at 11.48 MeV. The only observed decay branch is to the first T = 1 state in 6Li at 3.56 MeV. The apparent absence of an α-decay branch to the (T = 0) ground state in 6Li suggests that the 11.48-MeV state should be assigned isospin T = 1. The spin and parity of the 11.48-MeV state could not be directly determined from the present study apart from J = 0 being ruled out by the observed angular correlation. We conjecture that the 11.48-MeV state is the analog of the 10.15-MeV, (4+) state in 10Be, constitutes the third member of a rotational band built on the 0+ state at 7.65 MeV, and has pronounced molecular structure.