A highly resistive layer within the crust of X-ray pulsars limits their spin periods

@article{Pons2013AHR,
  title={A highly resistive layer within the crust of X-ray pulsars limits their spin periods},
  author={J. Pons and D. Vigan{\`o} and N. Rea},
  journal={Nature Physics},
  year={2013},
  volume={9},
  pages={431-434}
}
A pulsar is a rotating neutron star that beams out electromagnetic waves. The absence of isolated X-ray pulsars with periods longer than 12 s could be a clue to the structural composition of a neutron star’s crust, as simulations show that an amorphous layer would prevent a pulsar from spinning down. 

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