Last Updated：2025/12/06
(nuclear physics) A neutron produced as a result of nuclear fission which is emitted upon the radioactive decay of a fission product nucleus seconds to minutes later, rather than at the time of the initial fission event. Less than 2% of fission neutrons are delayed neutrons (the exact proportion depends on the nuclide being fissioned).
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delayed neutron
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Source Word
delayed neutron
Noun
(nuclear
physics)
A
neutron
produced
as
a
result
of
nuclear
fission
which
is
emitted
upon
the
radioactive
decay
of
a
fission
product
nucleus
seconds
to
minutes
later,
rather
than
at
the
time
of
the
initial
fission
event.
Less
than
2%
of
fission
neutrons
are
delayed
neutrons
(the
exact
proportion
depends
on
the
nuclide
being
fissioned).
Japanese Meaning
核分裂反応によって作られた中性子のうち、初期の核分裂の際には放出されず、核分裂生成物の原子核が放射性崩壊を起こすことによって、数秒から数分後に放出される中性子を指す。 / 全核分裂中性子の中で、約2%未満であり、その割合は反応対象の同位体に依存する。
Sense（1）
(nuclear
physics)
A
neutron
produced
as
a
result
of
nuclear
fission
which
is
emitted
upon
the
radioactive
decay
of
a
fission
product
nucleus
seconds
to
minutes
later,
rather
than
at
the
time
of
the
initial
fission
event.
Less
than
2%
of
fission
neutrons
are
delayed
neutrons
(the
exact
proportion
depends
on
the
nuclide
being
fissioned).
（ plural ）
