Energy-differential measurement of the <math><mrow><mmultiscripts><mi mathvariant="normal">C</mi><mprescripts/><none/><mi>nat</mi></mmultiscripts><mo>(</mo><mi>n</mi><mo>,</mo><mi>p</mi><mo>)</mo></mrow></math> and <math><mrow><mmultiscripts><mi mathvariant="normal">C</mi><mprescripts/><none/><mi>nat</mi></mmultiscripts><mo>(</mo><mi>n</mi><mo>,</mo><mi>d</mi><mo>)</mo></mrow></math> reactions at the n_TOF facility at CERN