Searching for the & gamma; decay from the near-neutron threshold 2+ state in 14C: A probe of collectivization phenomena in light nuclei

. - The & gamma; decay from the 2+2 near-threshold resonance in 14C, lo-cated 142 keV above the neutron emission threshold, was searched for in a fusion -evaporation experiment at Argonne National Laboratory with the GODDESS setup, comprising the GRETINA & gamma;-ray spectrometer coupled to the ORRUBA charged par-ticle detector. The Shell Model Embedded in the Continuum predicts a significant enhancement of the 2+2 & RARR; 0 transition probability, owing to a collectivization of the near-threshold state. The corresponding & gamma; branch is expected to be of the order of 5 x 10-5 , which is comparable with the sensitivity of this experiment.

Automated summary

The γ decay from the 2+2 near-threshold resonance in 14C was studied using the GODDESS setup, composed of the GRETINA γ-ray spectrometer and the ORRUBA charged particle detector, in a fusion-evaporation experiment at Argonne National Laboratory. The Shell Model Embedded in the Continuum predicts a significant enhancement of the 2+2 → 0 transition probability due to the collectivization of the near-threshold state. The experiment's sensitivity is comparable to the expected γ branch of about 5 x 10-5.