High-Pressure Reinforced Vessel, produced by Additive Manufacturing, to be used as a gas target for the measurement program at n_TOF - Multiple Argon Experiments (MArEX)

The n_TOF collaboration has expressed interest in conducting transmission experiments with liquid Ar and gaseous Ar (GAr) to improve the understanding of neutron propagation and capture in Ar. This topic is relevant to both nuclear and particle physics, as liquid Ar is widely used in neutrino experiments, dark matter searches, and other applications. Despite its widespread use, neutron interactions on Ar are still poorly characterized. In this context, the Multiple Argon Experiments (MArEX) initiative aims to address these gaps by providing detailed measurements of neutron and Ar interactions, including resolved resonance parameters and radiative capture widths, across an unprecedented energy range from 1 eV to 200 MeV. As part of MArEX research activities, this paper presents the development of an innovative High-Pressure Reinforced Vessel for GAr targets, produced by Additive Manufacturing and reinforced with carbon fibre. The experimental results confirmed the capability of the vessel to withstand high operating pressure without any issues, and the capability of the Multi-layers Finite Element Model to simulate and predict the stress behaviour and the operation limit of the vessel.