Mapping control-minus and control-pipe

Dear list,

I am happy tmux and vim user, but to reduce the mistakes caused
by muscle memory I would like to setup similar keybindings to the
two.

In tmux I use Ctrl-| to split the screen vertically and
Ctrl-Minus to split horizontally.

In vimrc I wrote:

nnoremap <C-Bar> <C-w>v
nnoremap <C--> <C-w>n

But it does not work. What is the correct binding?

Your faithfully,
Paolo

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