\version "2.19.5"

blackout =
  ^\tweak #'outside-staff-priority ##f
  ^\markup { \beam #0.9 #0 #0.5 }

% set the position of blackout on the staff
% 0 is center line, step is 0.5
fix =
#(define-music-function
     (parser location Y-offset)
     (number?)
   #{
      \once \override TextScript.Y-offset = #Y-offset
   #})

\score {
  \new MensuralStaff
    \relative c' {
      \[ d'1 \fix #1.5 e1*3/4\blackout \] e4
      \[ a1 \fix #2 f1*3/4 \blackout \] e4
      \[ b1 \fix #-1 g1*3/4 \blackout \] e4
      \[ b'1 \fix #0.5 c1*3/4 \blackout \] c4
      \[ e,1 \fix #-1.5 f1*3/4 \blackout \] c4
    }

  \layout {
    \set Score.defaultBarType = "-"
    \context {
      \MensuralStaff
      \override NoteHead.style = #'mensural
      \override Stem.thickness = #1.0
    }
    \context {
      \Voice
      \remove "Ligature_bracket_engraver"
      \consists "Mensural_ligature_engraver"
    }
  }
}