Fusion of 12C+28Si at deep sub-barrier energies
Abstract
The existence of fusion hindrance is not well established in light heavy-ion systems. Studying slightly heavier cases allows extrapolating the trend to light systems of astrophysical interest. Fusion of 12C + 28Si has been measured down to deep sub-barrier energies, using 28Si beams from the XTU Tandem accelerator of LNL on thin 12C targets. The fusion-evaporation residues were detected by a detector telescope following an electrostatic beam separator, and coincidences between the gamma-ray array AGATA and segmented silicon detectors DSSD were performed, where the evaporated light charged particles were identified by pulse shape analysis. Fusion cross sections have been obtained in the wide range 150 mb-42 nb. Coupled-channel (CC) calculations using a Woods-Saxon potential reproduce the data above 0.1 mb. Below that, hindrance shows up and the CC results overestimate the cross sections which get close to the one-dimensional potential tunnelling limit. This suggests that the coupling strengths gradually vanish, as predicted by the adiabatic model. The hindrance threshold follows a recently updated phenomenological systematics.
Keywords
Cite
@article{arxiv.2509.22349,
title = {Fusion of 12C+28Si at deep sub-barrier energies},
author = {A. M. Stefanini and G. Montagnoli and M. Del Fabbro and A. Goasduff and P. A. Aguilera Jorquera and G. Andreetta and F. Angelini and L. V. DAuria and M. Balogh and D. Bazzacco and J. Benito and G. Benzoni and M. A. Bentley and N. Bez and A. Bonhomme and S. Bottoni and A. Bracco and D. Brugnara and L. Busak and S. Capra and S. Carollo and S. Casans and E. Clement and P. Cocconi and A. Cogo and G. Colucci and A. Conte and E. Coradin and L. Corradi and S. Courtin and G. DeAngelis and J. M. Deltoro and G. Del Piero and R. Depalo and J. Dudouet and A. Ertoprak and E. Fioretto and A. Gadea and F. Galtarossa and A. Gambalonga and A. Giaz and B. Gongora Servin and V. Gonzalez and A. Gottardo and A. Gozzelino and G. Harmant and M. Heine and I. Kuti and M. Labiche and S. Lenzi and S. Leoni and M. Mazzocco and R. Menegazzo and D. Mengoni and T. Mijatovic and B. Million and E. Monpribat and A. Nannini and D. R. Napoli and A. E. Navarro-Anton and R. Nicolas del Alamo and J. Nyberg and S. Paschalis and J. Pellumaj and R. M. Perez-Vidal and M. Petri and E. Pilotto and S. Pigliapoco and Zs. Podolyak and M. Polettini and A. Pullia and L. Ramina and M. Rampazzo and W. Raniero and M. Rebeschini and F. Recchia and P. Reiter and K. Rezynkina and M. Rocchini and D. Rosso and E. Sanchis and M. Scarcioffolo and D. Scarpa and M. Senyigit and J. Simpson and D. Sohler and O. Stezowski and D. Stramaccioni and S. Szilner and Ch. Theisen and N. Toniolo and A. Trzcinska and J. J. Valiente Dobon and F. Veronese and Jelena Vesic and V. Volpe and K. Wimmer and L. Zago and I. Zanon and M. Zielinska},
journal= {arXiv preprint arXiv:2509.22349},
year = {2025}
}