Last Updated：2025/12/06
(nuclear physics) The point at which the prompt neutrons and delayed neutrons produced by a nuclear fission chain reaction, taken together, are just sufficient to sustain the chain reaction (the state of being delayed critical); in this state, changes in reaction power occur slowly, allowing the reaction to be controlled on human timescales, due to the relatively long time delay associated with the emission of the delayed neutrons necessary to maintain the chain reaction.
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delayed criticality
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Source Word
delayed criticality
Noun
uncountable
usually
(nuclear
physics)
The
point
at
which
the
prompt
neutrons
and
delayed
neutrons
produced
by
a
nuclear
fission
chain
reaction,
taken
together,
are
just
sufficient
to
sustain
the
chain
reaction
(the
state
of
being
delayed
critical);
in
this
state,
changes
in
reaction
power
occur
slowly,
allowing
the
reaction
to
be
controlled
on
human
timescales,
due
to
the
relatively
long
time
delay
associated
with
the
emission
of
the
delayed
neutrons
necessary
to
maintain
the
chain
reaction.
Japanese Meaning
核物理学において、即発中性子と遅延中性子の合計が、核分裂連鎖反応を維持するのにちょうど十分な状態を指す。 / この状態では、核反応の出力が緩やかに変化し、比較的長い遅延時間によって制御が可能となる。
Sense（1）
(nuclear
physics)
The
point
at
which
the
prompt
neutrons
and
delayed
neutrons
produced
by
a
nuclear
fission
chain
reaction,
taken
together,
are
just
sufficient
to
sustain
the
chain
reaction
(the
state
of
being
delayed
critical);
in
this
state,
changes
in
reaction
power
occur
slowly,
allowing
the
reaction
to
be
controlled
on
human
timescales,
due
to
the
relatively
long
time
delay
associated
with
the
emission
of
the
delayed
neutrons
necessary
to
maintain
the
chain
reaction.
（ plural ）
