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The purpose of this work is to search the Yangbajing neutron monitor dataobtained between 1998 October and 2000 June for solar neutrons associated withsolar flares. Using the onset times of 166 BATSE-detected flares with the GOESpeak flux (1 -- 8 \AA) higher than $1.0 \times 10^{-5}$ $\mathrm{Wm^{-2}}$, weprepare for each flare a light curve of the Yangbajing neutron monitor,spanning $\pm$ 1.5 hours from the BATSE onset time. Based on the light curves,a systematic search for solar neutrons in energies above 100 MeV from the 166flares was performed. No statistically significant signals due to solarneutrons were found in the present work. Therefore, we put upper limits on the$>$ 100 MeV solar-neutron flux for 18 events consisting of 2 X and 16 M classflares. The calculation assumed a power-law shaped neutron energy spectrum andthree types of neutron emission profiles at the Sun. Compared with the otherpositive neutron detections associated with X-class flares, typical 95%confidence level upper limits for the two X-class flares are found to becomparable to the lowest and second lowest neutron fluxes at the top of theatmosphere.In addition, the upper limits for M-class flares scatter in therange of $10^{-2}$ to 1 neutrons $\mathrm{cm^{-2}s^{-1}}$. This provides thefirst upper limits on the solar-neutron flux from M-class solar flares, usingspace observatories as well as ground-based neutron monitors.Comment: accepted for publication in Astronomy and Astrophysics, section 9.  The Su

Upper limits on the solar-neutron flux at the Yangbajing neutron monitor from BATSE-detected solar flares