https://doi.org/10.1140/epja/s10050-025-01775-3
Regular Article - Experimental Physics
A method to measure the angular differential cross section of (n, 
) reactions using gridded ionization chamber and gas sample
1
State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, School of Physics, Peking University, 100871, Beijing, China
2
National Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, 710024, Xi’an, China
3
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980, Dubna, Russia
4
Nuclear Research Centre, National University of Mongolia, Ulaanbaatar, Mongolia
5
Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980, Dubna, Russia
6
Institute of Experimental and Applied Physics, Czech Technical University in Prague, 212800, Prague, Czech Republic
7
The Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, 050032, Almaty, Kazakhstan
8
China Institute of Atomic Energy, 102413, Beijing, China
a
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Received:
22
August
2025
Accepted:
12
December
2025
Published online:
7
January
2026
Abstract
A method to measure the angular differential cross section of (n, ) reactions using gridded ionization chamber (GIC) and gas sample was established. The anode signal rise time is used to get the projection length of the track in the direction of the electric field (related to the 
emission angle). The anode signal amplitude is used to distinguish the events with the same anode signal rise time but different emission angles because of the PHD (pulse height defect) effect. Using this method, the angular differential cross sections of the 
O(n, 
)
C reaction at 10.45 MeV were measured based on the HI-13 tandem accelerator of China Institute of Atomic Energy (CIAE). The GIC was used as the charged particle detector, with working gas of 3.0 atm Kr+4.0%CO
. The oxygen atoms in the CO were used as the sample. Anode signal amplitude vs the anode signal rise time two-dimensional spectrum was used in this method to determine the count of the O(n, )C reaction events. A 
U
O
sample inside the GIC was used to determine the neutron fluences and an EJ-309 scintillation detector was placed on the beam line to measure the neutron energy spectra to correct the events induced by the low-energy neutrons.
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Communicated by Aurora Tumino.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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.
