Neutron knockout of 12(Be) populating neutron-unbound states in 11(Be)
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.
Published in: Physical Review C, Volume 83, Issue 5, May 31, 2011, pages 057304-. Copyright © 2011 American Physical Society, College Park, MD.. The final published version is available at: http://dx.doi.org/10.1103/PhysRevC.83.057304