Breakup ofBe9*(2.43 Mev)

Abstract

The breakup of ${\mathrm{Be}}^{9*}$ from the 2.43-Mev state has been studied. The level was excited by inelastic scattering of 42-Mev alpha particles and the breakup was studied by examining coincidences between inelastically scattered alpha particles and particles from the breakup. It was found that decay from this state proceeds less than 10% of the time by neutron emission to the ground state of ${\mathrm{Be}}^8$ and less than 1% of the time by gamma emission to the ground state of ${\mathrm{Be}}^9$. The low neutron-emission probability is consistent with the usual $\frac{5}{2}-$ spin-parity assignment for this state.