Investigating the structure of 11B using particle-γ coincidences

Bottoni, S.; Corbari, G.; Leoni, S.; Fornal, B.; Goasduff, A.; Capra, S.; Mengoni, D.; Albanese, E.; Ziliani, S.; Benzoni, G.; Sanchez-Benitez, A. M.; Bracco, A.; Brugnara, D.; Camera, F.; Ciemala, M.; Cieplicka-Orynczak, N.; Crespi, F. C. L.; Duenas, J. A.; Gadea, A.; Galtarossa, F.; Gamba, E.; Gottardo, A.; Gozzelino, A.; Ha, J.; Iskra, L. W.; Marchi, T.; Menegazzo, R.; Million, B.; Napoli, D. R.; Pasqualato, G.; Pellumaj, J.; Perez-Vidal, R.; Pigliapoco, S.; Polettini, M.; Porzio, C.; Recchia, F.; Rezynkina, K.; Valiente-Dobon, J. J.; Wieland, O.; Zanon, I.; Zhang, G.

doi:10.1016/j.nuclphysa.2025.123138

The structure of 11B was investigated at Legnaro National Laboratories of INFN using the 6Li(6Li,pγ) fusion-evaporation reaction. Emitted protons feeding excited states of 11B were detected by the GALTRACE silicon telescopes in coincidence with γ rays measured by the GALILEO HPGe array. The level and γ-decay scheme of 11B was reconstructed on an even-by-event basis by combining particle and γ-ray spectroscopy techniques. In particular, the γ decay from the possible near-threshold proton resonance was searched for, providing first results on its γ-ray branch with a 5σ and 3σ confidence level. Results are discussed along with predictions of the Shell Model Embedded in the Continuum (SMEC).