Correction to: Nature https://www.nature.com/articles/s41586-020-2177-0Published online 15 April 2020

In the Methods section of this Article, owing to an error during the production process, some reference citations were incorrectly cited. From “For the initial nuclear state… applying alternative multi-pion production tuning54”, the citation numbers have been corrected. The reference list is correct. The original Article has been corrected online.