Surrogate neutron-capture studies with fission detection in inverse kinematics at the ESR storage ring

Bogusław Włoch; Camille Berthelot; Guy Leckenby; Beatriz Jurado; Jerome Pibernat; Manfred Grieser; Jan Glorius; Yuri A. Litvinov; Laurent Audouin; Bertram Blank; Lucas Bégué--Guillou; Alex Cobo Zarzuelo; Sophia Florence Dellmann; Marc Dupuis; Oliver Forstner; Alexis Francheteau; David Freire Fernández; Miki Fukutome; Mathias Gerbaux; Jérôme Giovinazzo; Alexandre Gumberidze; Andreas Heinz; Ana Henriques; Regina Hess; Indu Jangid; Anton Kalinin; Wolfram Korten; Sergey Litvinov; Bernd Lorentz; Antonio M. Moro; Nikolaos Petridis; Ulrich Popp; Gregory Potel; Diego Ramos; Mathieu Roche; Mohammad Shahab Sanjari; Michele Sguazzin; Ragandeep Singh Sidhu; Uwe Spillmann; Markus Steck; Thomas Stoehlker; Takayuki Yamaguchi

arXiv · 2602.21256

Surrogate neutron-capture studies with fission detection in inverse kinematics at the ESR storage ring

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Abstract

The NECTAR (Nuclear rEaCTions At storage Rings) experiment at the ESR heavy-ion storage ring at GSI/FAIR Darmstadt is dedicated to surrogate reaction studies of neutron-induced reactions on heavy nuclei in inverse kinematics. In this work, we report on the implementation and performance of a newly developed fission-fragment detection system integrated into the NECTAR experimental setup. The upgraded detector configuration enables, for the first time in a surrogate experiment, the simultaneous detection ofgamma-decay residues, multi-neutron-emission residues, and fission fragments. The full setup was used for the first time in an experiment where a stored beam of bare 238U92+ ions at 17.24 MeV/u interacted with a gas-jet deuterium target, populating excited 238U and 239U nuclei via the 238U(d,d') and 238U(d,p) reactions. We describe the geometry of the used fission fragment detectors, design constraints, and simulation-based efficiency determination. The target-like particle identification and beam-like residue spectra demonstrating the performance of the complete setup are also shown.

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Bogusław Włoch, Camille Berthelot, Guy Leckenby, Beatriz Jurado, Jerome Pibernat, Manfred Grieser, Jan Glorius, Yuri A. Litvinov, Laurent Audouin, Bertram Blank, Lucas Bégué--Guillou, Alex Cobo Zarzuelo, Sophia Florence Dellmann, Marc Dupuis, Oliver Forstner, Alexis Francheteau, David Freire Fernández, Miki Fukutome, Mathias Gerbaux, Jérôme Giovinazzo, Alexandre Gumberidze, Andreas Heinz, Ana Henriques, Regina Hess, Indu Jangid, Anton Kalinin, Wolfram Korten, Sergey Litvinov, Bernd Lorentz, Antonio M. Moro, Nikolaos Petridis, Ulrich Popp, Gregory Potel, Diego Ramos, Mathieu Roche, Mohammad Shahab Sanjari, Michele Sguazzin, Ragandeep Singh Sidhu, Uwe Spillmann, Markus Steck, Thomas Stoehlker, Takayuki Yamaguchi. 2026-02-23. Surrogate neutron-capture studies with fission detection in inverse kinematics at the ESR storage ring. https://arxiv.org/abs/2602.21256

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