Phys.Rev. C 113, 034323 (2026)

X.Wang, P.Gueye, T.Baumann, B.M.Godoy, T.Redpath, J.Brown, P.A.DeYoung, N.Frank, W.Hopkins, A.N.Kuchera, M.Thoennessen, G.Votta, H.Webb

Search for the population of the ¹²Be isomeric 0₂⁺ state in the decay of ¹³Be

RADIOACTIVITY ¹³Be(n) [from ⁹Be(¹⁸O, X)¹⁴Be, E=78 MeV/nucleon; ⁹Be(¹⁴Be, n)¹³Be, E not given]; measured decay products, En, In, Eγ, Iγ; deduced γ-ray spectrum, nonobservation of 511 keV γ-rays in the delayed singles CAESAR data set the most stringent upper limit (6%) for the population of the 0₂⁺ state in ¹²Be from the neutron emission of the ¹³Be 500 keV p-wave resonance. The Modular Neutron Array (MoNA) and CAESium-iodide scintillator ARray (CAESAR) at the Coupled Cyclotron Facility of the National Superconducting Cyclotron Laboratory at Michigan State University.

doi: 10.1103/4qqb-md39