First sub-MeV nuclear reaction measurements in a heavy-ion storage ring

Marsh, J. J. and Bruno, C. G. and Davinson, T. and Woods, P. J. and Andelkovic, Z. and Barbieri, L. and Bemmerer, D. and Biniskos, A. and Boudefla, D. and Corvisiero, P. and Csedreki, László and Dellmann, S. F. and Fedotova, S. and Friere-Fernandez, D. and Forstner, O. and Glorius, J. and Gumberidze, A. and Hanu, E. O. and Herfurth, F. and Hillenbrand, P. M. and Hubbard, N. and Kalinin, A. and Krantz, C. and Lestinsky, M. and Litvinov, Yu. and Masha, E. and Menz, E. B. and Muller, D. A. and Nociforo, C. and Petridis, N. (2026) First sub-MeV nuclear reaction measurements in a heavy-ion storage ring. EUROPEAN PHYSICAL JOURNAL A: HADRONS AND NUCLEI, 62 (1). No. 10. ISSN 1434-6001

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Abstract

Heavy-ion storage rings present a novel approach to studying nuclear reactions for astrophysics that have so far resisted traditional methods. In this paper, we report the first nuclear reactions studied in a ring at sub-MeV centre-of-mass energies. This is a major advance in nuclear reaction measurements at rings that lays the foundations for future investigations to address key problems in nuclear astrophysics affecting a wide range of stellar environments. We investigated the 15N(p,p)15N and 15N(p,α) 12C reactions in inverse kinematics from E = 1.125 MeV/u down to E = 426 keV/u, using the CARME array in the low-energy CRYRING@ESR heavy-ion storage ring, located at the GSI Helmholtz Center for Heavy Ion Research. Our (p,p) scattering results are in excellent agreement with theoretical R matrix predictions. We also report on a (p,α) measurement at E = 426 keV/u, corresponding to Ecm = 403 keV, by far the lowest energy at which a nuclear reaction has ever been measured in a heavyion storage ring.

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