Secondary beam cocktail for the study of low-lying excited states of ⁴⁰Mg. The x axis is the mass to charge ratio. The y axis is the atomic number. Selected for an Editors’ Suggestion.

From the article:

First Spectroscopy of the Near Drip-line Nucleus ${}^{40}\mathrm{Mg}$
H. L. Crawford et al.
Phys. Rev. Lett. 122, 052501 (2019)

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