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

William A. Peters , T. Baumann , B. A. Brown , J. Brown , P. A. DeYoung , J. E. Finck , N. Frank , K. L. Jones

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J.-L. Lecouey B. Luther G. F. Peaslee W. F. Rogers A. Schiller M. Thoennessen J. A. Tostevin K. Yoneda

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classification ⚛️ nucl-ex

keywords stateexcitedknockoutneutronneutron-unboundstatesattributedbe-n

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Neutron-unbound resonant states of 11Be were populated in neutron knock-out reactions from 12Be and identified by 10Be-n coincidence measurements. A resonance in the decay-energy spectrum at 80(2) keV was attributed to a highly excited unbound state in 11Be at 3.949(2) MeV decaying to the 2+ excited state in 10Be. 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.

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

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