are able to absorb white dwarfs
(WD) for the Hubble time. The absorption of WD matter is
accompanied by neutronization and neutrino emission which energy
more than ten orders exceeds that of PBHs' Hawking radiation. The
most dense WD absorption is accompanied by the neutrino burst
carrying away 1051 erg and more for about a tenth of a second.
If such a burst takes place at several kiloparsecs from the Earth
it will be detected by the existing neutrino detectors with
confidence. The burst mentioned could heat the WD interior to the
temperatures high enough to ignite the nuclear burning giving rise
to a supernova-like explosion. The WDs absorbtion by PBHs and the
accompanying processes allow to improve the constraints on
abundance of weakly emitting PBHs by several orders.
Key words: black hole, detection, neutrino, white dwarf, supernova
