Investigation of particle-unbound excited states in light nuclei with resonance-decay spectroscopy using a Be-12 beam

Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of E/A=50 MeV {sup 12}Be on polyethylene and carbon targets. The particle-unbound states are produced in a variety of reaction mechanisms, ranging from projectile fragmentation to proton pickup. New proton-decaying excited states are observed in {sup 9}Li(E*=14.1{+-}0.1 MeV, {gamma}=207{+-}49 keV) and {sup 10}Be(E*=20.4{+-}0.1 MeV, {gamma}=182{+-}74 keV). In addition a new {alpha}-decaying state is observed in {sup 13}B(E*=13.6{+-}0.1 MeV, {gamma}{ 2. A second T=2 state was confirmed in {sup 12}B at 14.82 MeV, which decays to the p+{sup 11}Be, {sup 3}H+{sup 9}Be, and {alpha}+{sup 8}Li channels. Its width was found to be {gamma}{<=}100 keV and its spin is consistent with J{sup {pi}}=2{sup +}.