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how can I please write this? I can't find the right name to find it in instructions. Thank you. Look at picture

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1 Answer 1

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You can obtain what you want with the empheq package (needless to load amsmath nor mathtools):

\documentclass{article}
\usepackage{empheq}
\newcommand{\MeV}{\mathrm{MeV}}

\begin{document}

\begin{empheq}[left ={\dfrac{R_\beta\cdot\rho}{\mathrm{g\cdot cm^{-2}}} =\empheqlbrace}]{alignat* = 2}
& 0{,}407\,(E_0/\MeV)^{1{,}38} & 0{,}15 < E_0 & \le 0{,}8\,\MeV \\
& 0{,}542\,(E_0/\MeV)-0{,}133 & E_0 & > 0{,}8\,\MeV
\end{empheq}

\end{document} 

enter image description here

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