Recent data on fusion far below the barrier for 12C + 28Si

G. Montagnoli; M. Del Fabbro; A. M. Stefanini; M. Balogh; A. Goasduff; G. Andreetta; F. Angelini; J. Benito; A. Bonhomme; D. Brugnara; G. Colucci; L. Corradi; S. Courtin; R. Depalo; A. Ertoprak; E. Fioretto; F. Galtarossa; B. Gongora Servin; A. Gottardo; A. Gozzelino; M. Heine; M. Mazzocco; D. Mengoni; B. Million; E. Monpribat; R. Nicolas Del Alamo; J. Pellumaj; R.M. Perez Vidal; S. Pigliapoco; E. Pilotto; M. Polettini; K. Rezynkina; M. Rocchini; D. Stramaccioni; S. Szilner; A. Trzcinska; J. Valiente Dobon; L. Zago; I. Zanon

doi:10.1051/epjconf/202532400008

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Proceedings

Open Access

EPJ Web of Conferences 324, 00008 (2025)
https://doi.org/10.1051/epjconf/202532400008

Recent data on fusion far below the barrier for ¹²C + ²⁸Si

G. Montagnoli¹^,2^*, M. Del Fabbro¹^,3, A. M. Stefanini⁴, M. Balogh⁴, A. Goasduff⁴, G. Andreetta¹^,4, F. Angelini¹^,4, J. Benito¹^,2^,5, A. Bonhomme⁶, D. Brugnara⁴, G. Colucci⁷, L. Corradi⁴, S. Courtin⁶, R. Depalo⁸, A. Ertoprak⁴, E. Fioretto⁴, F. Galtarossa², B. Gongora Servin³^,4, A. Gottardo⁴, A. Gozzelino⁴, M. Heine⁶, M. Mazzocco¹^,2, D. Mengoni¹^,2, B. Million⁹, E. Monpribat⁶, R. Nicolas Del Alamo¹^,2, J. Pellumaj⁴, R.M. Perez Vidal⁴, S. Pigliapoco², E. Pilotto¹^,2, M. Polettini¹^,2, K. Rezynkina², M. Rocchini¹⁰, D. Stramaccioni¹^,4, S. Szilner¹¹, A. Trzcinska⁷, J. Valiente Dobon⁴, L. Zago¹^,4 and I. Zanon¹²

¹ Univ. of Padova, Italy
² INFN-Padova, Italy
³ Univ. of Ferrara, Italy
⁴ INFN-Lab. Naz. di Legnaro, Padova, Italy
⁵ Univ. Complutense de Madrid, Spain
⁶ IPHC/CNRS Strasbourg, France
⁷ HIL, Univ. Warsaw, Poland
⁸ Univ. of Milano, Italy
⁹ INFN-Milano, Italy
¹⁰ INFN-Firenze, Italy
¹¹ Ruder Bošković Institute, Zagreb, Croatia
¹² Univ. of Stockholm, Sweden

^* e-mail: giovanna.montagnoli@unipd.it

Published online: 11 April 2025

Abstract

Heavy-ion fusion reactions are essential to investigate the fundamental problem of quantum tunnelling of many-body systems in the presence of intrinsic degrees of freedom. Studying the fusion of light systems with Q > 0 and possibly identifying the hindrance phenomenon, requires challenging measurements. Investigating slightly heavier cases allows a reliable extrapolation towards the lighter astrophysical systems. We measured the fusion excitation function of ¹²C + ²⁸Si down to hundreds of nanobarns, using ²⁸Si beams from the XTU Tandem accelerator of LNL. The charged particles evaporated after the fusion process were detected by two DSSDs around the target. The prompt γ-rays emitted by the evaporation residues (ER) were detected by the γ-spectrometer AGATA. The fusion cross-sections are obtained from the coincident events between γ-rays and charged particles. The light-charged particles have been identified through pulse shape analysis, using the rise time, vs their energy E_part. The main transitions from the ER have been identified, and the fusion cross section is obtained by the number of coincident γ-particle events for all observed evaporation channels. Neutron evaporation is calculated to be limited to a few per cent for this system in the measured energy range. Preliminary analyses provide promising results in studying fusion cross sections for light systems at deep sub-barrier energies.

© The Authors, published by EDP Sciences, 2025

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.