We report the detection of X-ray pulsations with a period of \sim 315.87 ms from the 2009 XMM-Newton observation for the radio-quiet \gamma -ray pulsar , LAT PSR J0007+7303 , centered in the supernova remnant CTA 1 .
The detected pulsed period is consistent with the \gamma -ray periodicity at the same epoch found with the \it Fermi Gamma-ray Space Telescope .
The broader sinusoidal structure in the folded light curve of the X-ray emission is dissimilar to that of the \gamma -ray emission , and the phase of the peak is about 0.5 shifting from the peak in the \gamma -ray bands , indicating that the main component of the X-rays originates from different sites of the pulsar .
We conclude that the main component of the X-ray pulsation is contributed by the thermal emission from the neutron star .
Although with a significantly different characteristic age , PSR J0007+7303 is similar to Geminga in emission properties of X-rays and \gamma -rays ; this makes PSR J0007+7303 the second radio-quiet \gamma -ray pulsar with detected X-ray pulsations after Geminga .