LaTeX Forum

\begin{center}
\ch{^{A}_{Z}X -> ^{A-4}_{Z-2}Y + ^{4}_{2}He}
\end{center}

\begin{center}
\ch{^{A}_{Z}X -> ^{A}_{Z-1}Y + c^{-} + v_{e}}
\end{center}

$\nu$

\documentclass[border=10pt]{standalone}
\usepackage{chemformula}
\begin{document}
	\ch{^{A}_{Z}X -> ^{A}_{Z-1}Y + c^{-} + $\bar{\nu}$_{e}}
\end{document}

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{chemmacros,upgreek}
\NewChemParticle\neutrino{\chemnu_{$\!e$}}
\NewChemParticle\antineutrino{$\bar{\chemnu}$_{$\!e$}}

\NewChemParticle\betaminus{\chembeta-}
\NewChemParticle\betaplus{\chembeta+}

\begin{document}

Allgemein gilt für den \betaminus-Zerfall:
\begin{equation}
  \ch{^{$A$}_{$Z$}X -> ^{$A$}_{$Z+1$}Y + e- + \antineutrino}
\end{equation}

Allgemein gilt für den \betaplus-Zerfall:
\begin{equation}
  \ch{^{$A$}_{$Z$}X -> ^{$A$}_{$Z-1$}Y + e+ + \neutrino}
\end{equation}


\end{document}