The radiochemical purity of a

T

1/2

Cross section, b

Activity, Bq

130

Ba (0.106)

(n,

γ

)

131

Ba

11.8 days

10

7.72·10

8

(n,

γ

)

131m

Ba

14.6 min

2.5

5.55·10

9

(n, p)

130

Cs

29.21 min

1

1.55·10

8

132

Ba (0.097)

(n,

γ

)

133

Ba

10.5 yr

7

8.14 ·10

5

(n, p)

132

Cs

6.47 days

0.4

1.63·10

6

134

Ba (2.42)

(n,

γ

)

135m

Ba

1.2 days

0.16

8.18·10

8

(n, p)

134

Cs

2.06 yr

0.16

1.62 ·10

5

136

Ba (7.85)

(n,

γ

)

137m

Ba

2.55 min

0.011

1.92 ·10

8

(n, p)

136

Cs

13.16 days

1.3

4.74 ·10

8

137

Ba (11.23)

(n, p)

137

Cs

30.17 yr

0.25

1.85·10

5

138

Ba (71.7)

(n,

γ

)

139

Ba

1.38 h

0.36

5.92·10

10

(n, p)

138

Cs

32.8 min

0.002

2.26·10

7

131

Cs

(n,

γ

)

132

Cs 

6.47 days

250 [4]

7.03·10

3

405

TABLE 1. Nuclear-Physical Characteristics of Isotopes Formed in the Reactions (n,

γ

) and (n, p) under Irradiation of a Target

Consisting of Natural Barium by Thermal and Fast Neutrons with Density 5·10

13

and 3.5·10

11

sec

–1

·cm

–2