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請輸入英文單字,中文詞皆可:
positron 音標拼音: [p'ɑzətr
,
ɑn]
XDict
n
. 正電子
PyDict
正電子
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
positron
n
1
:
an
elementary
particle
with
positive
charge
;
interaction
of
a
positron
and
an
electron
results
in
annihilation
[
synonym
:
{
positron
}, {
antielectron
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
antipartticle
\
an
`
ti
*
part
"
ti
*
cle
\
([
a
^]
n
`
t
[
i
^]*[
aum
]
r
"
t
[
i
^]*
k
'
l
),
n
. (
Physics
)
A
fundamental
particle
which
has
the
same
mass
as
one
of
the
common
fundamental
particles
,
but
which
has
an
opposite
charge
,
and
for
which
certain
other
of
the
properties
(
e
.
g
.
baryon
number
,
strangeness
)
may
be
opposite
to
that
of
the
normal
particle
.
The
antiparticle
to
an
electron
is
called
a
{
positron
};
the
antiparticle
to
a
proton
is
called
an
{
antiproton
};
the
antiparticle
to
a
neutron
is
called
an
{
antineutron
}.
When
a
particle
and
its
corresponding
antiparticle
collide
,
they
typically
annihilate
each
other
with
the
production
of
large
quantities
of
energy
,
usually
in
the
form
of
radiation
.
The
interaction
of
a
proton
and
antiproton
cause
annihilation
with
production
of
mesons
.
[
PJC
]
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