$B_{-}$ is reflected, and at $x>0$, a right-moving wave of magnitude $C_{+}$ is refracted. The parameters $k$ and $k'$ are connected with the energy as $$\begin{aligned}
& &E={p^2 \over 2m}+V_0={p'^2 \over 2m},\\
& &p=\hbar k,~p'=\hbar k'.\end{aligned}$$ The coefficients are found from the continuities of the wave function at $x=0$ as [@Landau] $$\begin{aligned}
& &B_{-}={k-k' \over k+k'},\\
& &C_{+}={2k \over k+k' }.\end{aligned}$$ The time-dependent wave packet is constructed using a linear combination of the above waves, $$\begin{aligned}
\psi_{wp}&=&\psi_{wp}^1+\psi_{wp}^2+\psi_{wp}^3,\\
\psi_{wp}^1&=&\int dk \tilde N(k) e^{i k (x-X_0)}e^{Et \over i\hbar}, x<0,       \\
\psi_{wp}^2& &=\int dk \tilde N(k)\left( {k-k' \over k+k'}\right) e^{-i k(x-X_0)}e^{Et \over i\hbar},x<0  ,\\
\psi_{wp}^3& &=\int dk \tilde N(k)\left({2k \over k+k'}\right)e^{i k'(x-X_0)}e^{Et \over i\hbar},0<x ,\end{aligned}$$ where $$\begin{aligned}
\tilde N(k)&=&N_1 e^{-{(k-k_0)^2 \over 2\sigma}},\\
\label{normalization}
N_1&=&{1 \over \sqrt{2\sigma \pi}}.\end{aligned}$$ The wave packet $\psi_{wp}^1$ is a minimum wave packet, but the wave packets $\psi_{wp}^2$ and $\psi_{wp}^3$ are not minimum wave packets owing to the momentum-dependent factors in the amplitudes, ${{ k-k' \over
k+k'},{2k \over k+k'}}$. $$\begin{aligned}
& &\delta x^1 \times \delta p^1= {\hbar \over 2},\\
& &\delta x^2 \times \delta p^2 = (1.2 \sim 1.4)\times {\hbar \over 2},\\
& &\delta x^3 \times \delta p^3= (1.0 \sim 3.0)\times {\hbar \over 2}.\end{aligned}$$ The initial wave packet is chosen 