  The Fermi Large Area Telescope (LAT) is a powerful pulsar detector, as
demonstrated by the over one hundred objects in its second catalog of pulsars.
Pass 8 is a new reconstruction and event selection strategy developed by the
Fermi-LAT collaboration. Due to the increased acceptance at low energy, Pass 8
improves the pulsation detection sensitivity. Ten new pulsars rise above the 5
sigma threshold and are presented in this work, as well as one previously seen
with the former Pass 7 reconstruction.
  More than 60$\%$ of the known pulsars with spin-down power ($\dot{E}$)
greater than $10^{36}$ erg/s show pulsations in gamma-rays, as seen with the
Fermi Large Area Telescope. Many non-detections of these energetic pulsars are
thought to be a consequence of a high background level, or a large distance
leading to a flux below the sensitivity limit of the instrument. The gamma-ray
beams of the others probably miss the Earth. The new Pass 8 data now allows the
detection of gamma ray pulsations from three of these high spin-down pulsars,
PSRs J1828$-$1101, J1831$-$0952 and J1837$-$0604, as well as three others with
$\dot{E}$ $\ge 10^{35}$ erg/s. We report on their properties and we discuss the
reasons for their detection with Pass 8.
