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a+b → c
1
+c
2
+
. . .+ c
n
d
3
σ = f
n
(P
1
, . . . , P
n
, s)
n
Y
i=1
d
3
p
i
E
i
.
f
n
(P
1
, . . . , P
n
, s) = const
T
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Ω
r
0
= ¯h/m
π
c
Ω =
4
3
πr
3
0
γ
c
=
Ω
γ
c
,
γ
c
= E
∗
/mc
2
E
∗
ε ε ∼ (kT )
4
E
∗
∼ Ω(kT )
4
, Ω =
Ω
0
γ
c
=
Ω
0
mc
2
E
∗
, E
∗
∼
Ω
0
mc
2
E
∗
(kT )
4
,
E
∗2
∼ Ω
0
mc
2
(kT )
4
, E
∗
∼
q
Ω
0
mc
2
(kT )
2
.
kT
E
∗
n =
E
∗
kT
∼ (E
∗
)
1/2
∼ E
1/4
,
E
E
1/4
n ∼ E
1/3
n ∼ E
1/2
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π
E ∼ kT ∼ m
π
c
2
.
kT ≫ mc
2
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N
p
: N
π
= 8: 3
π
π
+
π
−
π
0
n p ¯n ¯p
−1/2
kT ∼ m
π
c
2
n ∼ E
1/4
.
4 ·10
14
p
⊥
= p sin θ = p
∗
sin θ
∗
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E
∗
T ∼
√
E
∗
m 2π 3π 4π 5π 6π
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kT ∼
m
π
c
2
p
∗
⊥
∼ m
π
c
2
q
a
b
c d a c
b d q
2
= (P
a
−P
c
)
2
= (P
b
−P
d
)
2
π
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P
i
q
i
a
P
1
q
1
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P
2
q
2
q
N−1
b
hp
⊥
i ≈ 0.35
ρ
p
⊥
x
i
= p
i
/p
i−1
< 1;
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x
i
p
⊥i
∆y
i
= y
i+1
− y
i
≈ ln[x
i+1
m
⊥i
/m
⊥i+1
],
m
⊥i
∆y
i
dN/dy ≈ const.
dN/dy
hni ≈
Z
y
a
y
b
dN
dy
dy ≈ a ln(y
a
− y
b
) + b = a ln
s
m
2
+ p
2
⊥
+ b.
”
b“
x
i
=
= p
i
/p
i−1
< 1
”
a“
y
∗
= 0
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√
s
1
√
s
2
s
1
< s
2
10
12