Scanning optical microscope based on an electron-beam-pumped semiconductor laser

Abstract

PACS. 95.80Q -Gamma-ray and elementary particle.PACS. 97.605 -Neutron stars.PACS. 98.70R -Gamma-ray sources. PACS. 97.60Gpulsars.Abstract. -Accumulated y-ray evidence on the time variability of the pulse height ratio (PHR) of the Crab pulsar is shown to be compatible with a long-term (-10.7 y) periodicity and can be interpreted as the free precession of the underlying neutron star. A prediction for the value of PHR by the coming GRO-EGRET y-ray observations under the present model is presented.