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The Be/X-ray binary system A0535+262 underwent a giant outburst in May-June2005, followed by a dimmer outburst in August-September 2005. This increasedintensity provided an opportunity to search for redshifted neutron-capturelines from the surface of the neutron star. If discovered, such lines wouldconstrain the neutron star equation of state, providing the motivation of thissearch. The spectrometer (SPI) on board the INTEGRAL satellite observed thedimmer outburst and provided the data for this research. We have not detected aline with enough significance, with the width-dependent upper limits on thebroadened and redshifted neutron capture line in the range of (2 - 11) x10^(-4) photons cm^(-2) s^(-1). To our knowledge, these are the strongest upperlimits on the redshifted 2.2 MeV emission from an accreting neutron star. Ouranalysis of the transparency of the neutron star surface for 2.2 MeV photonsshows that photons have a small but finite chance of leaving the atmosphereunscattered, which diminishes the possibility of detection.

Search for Redshifted 2.2 MeV Neutron Capture Line From A0535+262 in Outburst