  MAXI J1807+132 is a low-mass X-ray binary (LMXB) first detected in outburst
in 2017. Observations during the 2017 outburst did not allow for an unambiguous
identification of the nature of the compact object. MAXI J1807+132 was detected
in outburst again in 2019 and was monitored regularly with NICER. In this paper
we report on five days of observations during which we detected three
thermonuclear (Type-I) X-ray bursts, identifying the system as a neutron star
LMXB. Time-resolved spectroscopy of the three Type-I bursts revealed typical
characteristics expected for these phenomena. All three Type-I bursts show slow
rises and long decays, indicative of mixed H/He fuel. We find no strong
evidence that any of the Type-I bursts reached the Eddington Luminosity;
however, under the assumption that the brightest X-ray burst underwent
photospheric radius expansion, we estimate a <12.4kpc upper limit for the
distance. We searched for burst oscillations during the Type-I bursts from MAXI
J1807+132 and found none (<10% amplitude upper limit at 95% confidence level).
Finally, we found that the brightest Type-I burst shows a ~1.6sec pause during
the rise. This pause is similar to one recently found with NICER in a bright
Type-I burst from the accreting millisecond X-ray pulsar SAX J1808.4-3658. The
fact that Type-I bursts from both sources can show this type of pause suggests
that the origin of the pauses is independent of the composition of the burning
fuel, the peak luminosity of the Type-I bursts, or whether the NS is an X-ray
pulsar.
