https://doi.org/10.1140/epja/s10050-026-01866-9
Regular Article - Experimental Physics
On the first measurements of the excitation function for the 
reaction by the TTIK approach
1
Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, 010000, Astana, Kazakhstan
2
Nazarbayev University Research Administration, 010000, Astana, Kazakhstan
3
Dipartimento di Ingegneria e Architettura, Università degli Studi di Enna ”Kore”, 94100, Enna, Italy
4
Cyclotron Institute, Texas A&M University, 77843, College Station, TX, USA
5
Department of Physics, School of Sciences and Humanities, Nazarbayev University, 010000, Astana, Kazakhstan
6
INFN-Laboratori Nazionali del Sud, 95125, Catania, Italy
7
Department of Physics and Astronomy, Texas A&M University, 77843, College Station, TX, USA
a
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Received:
24
January
2026
Accepted:
22
April
2026
Published online:
22
May
2026
Abstract
A contradiction was observed between the first measurements of the excitation function for the 
C(
,n)
O reaction at 180
using the Thick Target Inverse Kinematics (TTIK) approach and an analysis based mainly on data from the forward hemisphere. We found that the most recent broad R-matrix analysis describes the TTIK data much better. The discrepancy appears to originate from incorrect signs of several 
O resonance amplitudes used in the earlier R-matrix analysis. The present results demonstrate that TTIK measurements play a crucial role in constraining resonance parameters in reactions that produce neutrons in the final state and represent a unique tool for studies of similar reactions induced by rare beams.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
Communicated by Anu Kankainen.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
