RT Journal Article
T1 Search for the γ decay of the narrow near-threshold proton resonance in 11B
A1 Bottoni, Simone
A1 Corbari, G
A1 Leoni, S
A1 Fornal, B
A1 Goasduff, A
A1 Capra, S
A1 Mengoni, D
A1 Albanese, E
A1 Ziliani, S
A1 Dueñas Díaz, José Antonio
AB The γ decay of the elusive narrow, near-threshold proton resonance in 11B was investigated at Laboratori Nazionali di Legnaro (INFN) in a particle-γ coincidence experiment, using the 6Li(6Li,pγ) fusion-evaporation reaction and the GALILEO-GALTRACE setup. No clear signature was found for a possible E1 decay to the 1/2, first-excited state of 11B, predicted by the Shell Model Embedded in the Continuum (SMEC) with a branching of  with respect to the dominant particle-decaying modes. The statistical analysis of the γ-ray spectrum provided an average upper limit of  for this γ-ray branching, with a global significance of 5σ. On the other hand, by imposing a global confidence level of 3σ, a significant excess of counts was observed for E keV, corresponding to a resonance energy of 11429(20) keV (namely 200(20) keV above the proton separation energy of 11B) and a γ-ray branching of . This result is compatible with the SMEC calculations, potentially supporting the existence of a near-threshold proton resonance in 11B.
PB Elsevier
SN 0370-2693
SN 1873-2445 (electrónico)
YR 2024
FD 2024
LK https://hdl.handle.net/10272/24059
UL https://hdl.handle.net/10272/24059
LA eng
NO Bottoni, S., Corbari, G., Leoni, S., Fornal, B., Goasduff, A., Capra, S., Mengoni, D., Albanese, E., Ziliani, S., Benzoni, G., Sánchez-Benítez, A. M., Bracco, A., Brugnara, D., Camera, F., Ciemała, M., Cieplicka-Oryńczak, N., Crespi, F. C. L., Dueñas, J. A., Gadea, A., … Zhang, G. (2024). Search for the γ decay of the narrow near-threshold proton resonance in 11B. In Physics Letters B (Vol. 855, p. 138851). Elsevier BV. https://doi.org/10.1016/j.physletb.2024.138851
NO This work was supported by the Italian Istituto Nazionale di Fisica Nucleare, the Polish National Science Centre, Poland under research project No. 2020/39/D/ST2/03443, the PRIN2017 call for funding, under the project 2017P8KMFT CTADIR from the Italian Ministry of Education, University and Research, the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, grant no. 2020R1A6A3A03039081, the MCIN/AEI/10.13039/501100011033, Spain with grant PID2020-118265GB-C42, by Generalitat Valenciana, Spain with grant CIAPOS/2021/114 and by the EU FEDER funds.
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026