The continuous spontaneous localization (CSL) model is one of the most promising approaches to address the wave-function collapse problem in the measurement process of standard quantum mechanics. In this work, the effect of the CSL model on a Bragg atom interferometer is investigated. A Bragg interferometer achieving high fringe contrast of $99\%$ is demonstrated, maintaining this performance level at an interrogation time of up to $T=60\mathrm{ms}$. The primary factors responsible for fringe contrast loss in the atom interferometer are systematically analyzed and corrected. This improvement establishes an upper limit of ${\lambda }_{\mathrm{CSL}}=1.27\times {10}^{-5}{\mathrm{s}}^{-1}\mathrm{at}{r}_C={10}^{-5}\mathrm{m}$ for the CSL collapse rate, representing approximately 4 times enhancement over previous atom-interferometric constraints.

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• Atom interferometry
• Atoms
• Diffusion quantum Monte Carlo