Ks. Cheng et Zg. Dai, CONVERSION OF NEUTRON-STARS TO STRANGE STARS AS A POSSIBLE ORIGIN OF GAMMA-RAY BURSTS, Physical review letters, 77(7), 1996, pp. 1210-1213
We propose that some neutron stars in low-mass x-ray binaries can accr
ete sufficient mass to undergo a phase transition to become strange st
ars. The energy released per conversion event satisfies the requiremen
ts of cosmological gamma-ray bursts, and the Lorentz factor of the res
ultant expanding fireball may exceed 5 x 10(3) because the strange sta
r has very low baryon contamination. The model burst rate is consisten
t with observations.