2016, a breakthrough anomaly was reported in the isoscalar magnetic dipole transition in8Be via the Internal Pair Creation process. An unexpected angular distribution of the relative angle of the e+e− was measured at the Atomki Laboratory. This phenomenon was explained considering the assumption of an emission of a neutral boson, named X17, with a mass of 16.70±0.35(stat)±0.5(syst) MeV/c2 and Jπ =1+. This finding triggered a global campaign to search for the new boson claimed. In Italy, at the Legnaro National Laboratories, a novel scintillator detector array has been designed and built. The present work reports the status of the first in-beam experiments performed in 2023 and 2024.
Searching for internal pair creation anomalies and the X17 boson at LNL / B. Gongora Servin, T. Marchi, D. Tagnani, A. Caletano, A. Goasduff, J.J. Valiente-Dobon, P. Aguilera, F. Angelini, F. Azaiez, L. Baldesi, M. Balogh, S. Barlini, J. Benito-Garcia, R. Bolzonella, S. Bottoni, D. Brugnara, A. Camaiani, S. Carollo, G. Casini, G. Cobari, D. Dell'Aquila, F. Ercolano, A. Ertroprak, D. Fabris, F. Galtarossa, A. Gottardo, A. Gozzelino, F. Gramegna, D. Lazzaretto, I. Lombardo, D. Mengoni, A. Nannini, L. Palombini, J. Pellumaj, R.M. Perez-Vidal, S. Piantelli, S. Pigliapoco, E. Pilotto, M. Polettini, M. Sigmund, G. Spina, D. Stramaccioni, F. Recchia, L. Redigolo, K. Rezynkina, L. Rigon, M. Rocchini, M. Rossi, M. Sedlak, F. Simpsi, S. Valdre, M. Vigilante, L. Zago, I. Zanon, L. Zappacosta. - In: NUOVO CIMENTO DELLA SOCIETÀ ITALIANA DI FISICA. C, GEOPHYSICS AND SPACE PHYSICS. - ISSN 1826-9885. - 48:1(2025 Feb), pp. 23.1-23.5. (Intervento presentato al 16. convegno Workshop on Particle Correlations and Femtoscopy, WPCF and 4th Resonance Workshop : 6 through 10 November tenutosi a Catania nel 2023) [10.1393/ncc/i2025-25023-4].
Searching for internal pair creation anomalies and the X17 boson at LNL
S. Bottoni;
2025
Abstract
2016, a breakthrough anomaly was reported in the isoscalar magnetic dipole transition in8Be via the Internal Pair Creation process. An unexpected angular distribution of the relative angle of the e+e− was measured at the Atomki Laboratory. This phenomenon was explained considering the assumption of an emission of a neutral boson, named X17, with a mass of 16.70±0.35(stat)±0.5(syst) MeV/c2 and Jπ =1+. This finding triggered a global campaign to search for the new boson claimed. In Italy, at the Legnaro National Laboratories, a novel scintillator detector array has been designed and built. The present work reports the status of the first in-beam experiments performed in 2023 and 2024.
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