# A Volume Element for Isotropic Harmonic oscillator

#### Diracobama2181

I am currently having trouble deriving the volume element for the first octant of an isotropic 3D harmonic oscillator.
I know the answer I should get is $$dV=\frac{1}{2}k^{2}dk$$.
What I currently have is $$dxdydz=dV$$ and k=x+y+z. But from that point on, I'm stuck. Any hints or reference material would be greatly appreciated. Thank you.

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