Europium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

130Eu

129.96357 (54)

 

1.1

ms

-33,940 (500)

7,953 (4)

p

?

131Eu

130.95775 (43)

 

17.8

ms

-39,350 (400)

7,995 (3)

p

?

132Eu

131.95437 (43)

 

100

ms

-42,500 (400)

8,020 (3)

B+ ?

 

133Eu

132.94924 (32)

 

200

ms

-47,280 (300)

8,056 (2)

B+ ?

 

134Eu

133.94651 (21)

 

500

ms

-49,830 (200)

8,075 (1)

B+

100

135Eu

134.94182 (32)

 

1.5

s

-54,190 (300)

8,108 (2)

B+

100

136Eu

135.93960 (21)

 

3.3

s

-56,260 (200)

8,123 (1)

B+

100

137Eu

136.93557 (21)

 

8.4

s

-60,020 (200)

8,150 (1)

B+

100

138Eu

137.933709 (30)

 

12.1

s

-61,750 (28)

8,161.6 (2)

B+

100

139Eu

138.929792 (14)

 

17.9

s

-65,398 (13)

8,187.22 (9.5)

B+

100

140Eu

139.928088 (55)

 

1.51

s

-66,986 (52)

8,197.7 (3.7)

B+

100

141Eu

140.924931 (14)

 

40.7

s

-69,927 (13)

8,217.69 (9)

B+

100

142Eu

141.923435 (33)

 

2.36

s

-71,320 (31)

8,226.5 (2.2)

B+

100

143Eu

142.920298 (12)

 

2.59

m

-74,242 (11)

8,245.82 (7.7)

B+

100

144Eu

143.918817 (12)

 

10.2

s

-75,622 (11)

8,254.19 (7.5)

B+

100

145Eu

144.9162652 (41)

 

5.93

d

-77,998.4 (3.8)

8,269.32 (2.7)

B+

100

146Eu

145.9172058 (67)

 

4.61

d

-77,122.3 (6.2)

8,261.96 (4.3)

B+

100

147Eu

146.9167461 (35)

 

24.1

d

-77,550.5 (3.2)

8,263.58 (2.2)

B+~100

 

148Eu

147.918086 (11)

 

54.5

d

-76,302 (10)

8,253.85 (6.9)

B+

100

149Eu

148.9179312 (47)

 

93.1

d

-76,446.6 (4.3)

8,253.59 (2.9)

EC

150Eu

149.9197018 (70)

 

36.9

y

-74,797.3 (6.5)

8,241.38 (4.3)

B+

100

151Eu

150.9198502 (26)

47.81 (3)

stable

 

-74,659.1 (2.5)

8,239.34 (1.6)

 

 

152Eu

151.9217445 (26)

 

13.537

y

-72,894.5 (2.5)

8,226.62 (1.6)

B+

72.1 3

153Eu

152.9212303 (26)

52.19 (3)

stable

 

-73,373.5 (2.5)

8,228.74 (1.6)

 

 

154Eu

153.9229792 (26)

 

8.593

y

-71,744.4 (2.5)

8,217.14 (1.6)

B-~100

 

155Eu

154.9228933 (27)

 

4.7611

y

-71,824.5 (2.5)

8,216.72 (1.6)

B-

100

156Eu

155.9247522 (62)

 

15.19

d

-70,092.8 (5.8)

8,204.68 (3.7)

B-

100

157Eu

156.9254236 (57)

 

15.18

h

-69,467.4 (5.3)

8,199.85 (3.4)

B-

100

158Eu

157.927845 (83)

 

45.9

m

-67,212 (77)

8,184.8 (4.9)

B-

100

159Eu

158.9290889 (79)

 

18.1

m

-66,053.3 (7.3)

8,176.76 (4.6)

B-

100

160Eu

159.93197 (22)

 

38

s

-63,370 (200)

8,159 (1)

B-

100

161Eu

160.93368 (32)

 

26

s

-61,780 (300)

8,149 (2)

B-

100

162Eu

161.93704 (32)

 

10.6

s

-58,650 (300)

8,129 (2)

B-

100

163Eu

162.93921 (54)

 

6

s

-56,630 (500)

8,116 (3)

B- ?

 

164Eu

163.94299 (64)

 

2

s

-53,100 (600)

8,095 (4)

B- ?

 

165Eu

164.94572 (75)

 

1

s

-50,560 (700)

8,079 (4)

B- ?

 

166Eu

165.94997 (86)

 

400

ms

-46,600 (800)

8,055 (5)

B- ?

 

167Eu

166.95321 (86)

 

200

ms

-43,590 (800)

8,037 (5)

B- ?

 

136mEu

135.93960 (21)

 

3.8

s

-56,260 (200)

8,123 (1)

B+

100

140mEu

139.928088 (55)

 

125

ms

-66,986 (52)

8,197.7 (3.7)

IT~100

 

141mEu

140.924931 (14)

 

2.7

s

-69,927 (13)

8,217.69 (9)

IT

86 3

142mEu

141.923435 (33)

 

1.223

m

-71,320 (31)

8,226.5 (2.2)

B+

100

143mEu

142.920298 (12)

 

50

us

-74,242 (11)

8,245.82 (7.7)

IT

100

144mEu

143.918817 (12)

 

1

us

-75,622 (11)

8,254.19 (7.5)

IT

100

145mEu

144.9162652 (41)

 

490

ns

-77,998.4 (3.8)

8,269.32 (2.7)

IT

100

146mEu

145.9172058 (67)

 

235

us

-77,122.3 (6.2)

8,261.96 (4.3)

IT

100

150mEu

149.9197018 (70)

 

12.8

h

-74,797.3 (6.5)

8,241.38 (4.3)

B-

89 2

151mEu

150.9198502 (26)

 

58.9

us

-74,659.1 (2.5)

8,239.34 (1.6)

0

 

152mEu

151.9217445 (26)

 

9.3116

h

-72,894.5 (2.5)

8,226.62 (1.6)

B-

72 4

154mEu

153.9229792 (26)

 

46.3

m

-71,744.4 (2.5)

8,217.14 (1.6)

IT

100

152m1Eu

151.9217445 (26)

 

96

m

-72,894.5 (2.5)

8,226.62 (1.6)

IT

100

Data Source: ENSDF March 2005

©Radiochemistry Society 2005