| Title: |
Search for the γ decay of the narrow near-threshold proton resonance in 11B |
| Authors: |
S. Bottoni, G. Corbari, S. Leoni, B. Fornal, A. Goasduff, S. Capra, D. Mengoni, E. Albanese, S. Ziliani, G. Benzoni, A.M. Sánchez-Benítez, A. Bracco, D. Brugnara, F. Camera, M. Ciemała, N. Cieplicka-Oryńczak, F.C.L. Crespi, J.A. Dueñas, A. Gadea, F. Galtarossa, E. Gamba, A. Gottardo, A. Gozzelino, J. Ha, Ł.W. Iskra, T. Marchi, R. Menegazzo, B. Million, D.R. Napoli, G. Pasqualato, J. Pellumaj, R.M. Pérez-Vidal, S. Pigliapoco, M. Polettini, C. Porzio, F. Recchia, K. Rezynkina, J.J. Valiente-Dóbon, O. Wieland, I. Zanon, G. Zhang |
| Source: |
Physics Letters B, Vol 855, Iss , Pp 138851- (2024) |
| Publisher Information: |
Elsevier, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Physics |
| Subject Terms: |
11B, Near-threshold resonance, γ-ray decay, Continuum shell model, Physics, QC1-999 |
| More Details: |
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 1/21−, first-excited state of 11B, predicted by the Shell Model Embedded in the Continuum (SMEC) with a branching of 0.98−69+167×10−3 with respect to the dominant particle-decaying modes. The statistical analysis of the γ-ray spectrum provided an average upper limit of 2.37×10−3 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=γ9300(20) 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 1.12(35)×10−3. This result is compatible with the SMEC calculations, potentially supporting the existence of a near-threshold proton resonance in 11B. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
0370-2693 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S037026932400409X; https://doaj.org/toc/0370-2693 |
| DOI: |
10.1016/j.physletb.2024.138851 |
| Access URL: |
https://doaj.org/article/67f93daac8cf4e5f9fa7da29979b0e7a |
| Accession Number: |
edsdoj.67f93daac8cf4e5f9fa7da29979b0e7a |
| Database: |
Directory of Open Access Journals |
