Neutron knockout of 12(Be) populating neutron-unbound states in 11(Be)

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Article co-authored by 14 additional non-Hope College authors from eight other institutions.


Neutron-unbound resonant states of Be-11 were populated in neutron knockout reactions from Be-12 and identified by Be-10-n coincidence measurements. A resonance in the decay-energy spectrum at 80(2) keV was attributed to a highly excited unbound state in Be-11 at 3.949(2) MeV decaying to the 2(+) excited state in Be-10. A knockout cross section of 15(3) mb was inferred for this 3.949(2) MeV state, suggesting a spectroscopic factor near unity for this 0p3/2-level, consistent with the detailed shell model calculations.