  Let $\{X_t\}_{t\geq 0 }$ be a $d$-dimensional supercritical super-Brownian
motion started from the origin with branching mechanism $\psi$. Denote by
$R_t:=\inf\{r>0:X_s(\{x\in \mathbb{R}^d:|x|\geq r\})=0,~\forall~0\leq s\leq
t\}$ the radius of the minimal ball (centered at the origin) containing the
range of $\{X_s\}_{s\geq 0 }$ up to time $t$. In \cite{Pinsky}, Pinsky proved
that condition on non-extinction, $\lim_{t\to\infty}R_t/t=\sqrt{2\beta}$ in
probability, where $\beta:=-\psi'(0)$. Afterwards, Engl\"{a}nder
\cite{Englander04} studied the lower deviation probabilities of $R_t$. For the
upper deviation probabilities, he \cite[Conjecture 8]{Englander04} conjectured
that for $\rho>\sqrt {2\beta}$,
  $$ \lim_{t\to\infty}\frac{1}{t}\log\mathbb{P}(R_t\geq \rho
t)=-\left(\frac{\rho^2}{2}-\beta\right). $$ In this note, we confirmed this
conjecture.
