Hafnium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

153Hf

152.97069 (54)

 

400

ms

-27,300 (500)

7,882 (3)

B+ ?

 

154Hf

153.96486 (54)

 

2

s

-32,730 (500)

7,918 (3)

B+~100

 

155Hf

154.96339 (43)

 

890

ms

-34,100 (400)

7,928 (3)

B+~100

 

156Hf

155.95936 (22)

 

23

ms

-37,850 (210)

7,953 (1.3)

A

97 3

157Hf

156.95840 (21)

 

115

ms

-38,750 (200)

7,959 (1)

A

86 9

158Hf

157.954799 (19)

 

2.84

s

-42,104 (18)

7,981.3 (1.1)

B+

55 3

159Hf

158.953995 (18)

 

5.2

s

-42,854 (17)

7,986.6 (1.1)

B+

65 7

160Hf

159.950684 (12)

 

13.6

s

-45,937 (12)

8,006.37 (7.2)

B+

99.3 2

161Hf

160.950275 (24)

 

18.2

s

-46,319 (23)

8,009.1 (1.4)

B+~100

 

162Hf

161.947210 (10)

 

39.4

s

-49,173.1 (9.6)

8,027.15 (5.9)

B+~100

 

163Hf

162.947089 (30)

 

40

s

-49,286 (28)

8,028.1 (1.7)

B+

100

164Hf

163.944367 (22)

 

111

s

-51,822 (20)

8,043.8 (1.2)

B+

100

165Hf

164.944567 (30)

 

76

s

-51,636 (28)

8,042.9 (1.7)

B+

100

166Hf

165.942180 (30)

 

6.77

m

-53,859 (28)

8,056.4 (1.7)

B+

100

167Hf

166.942600 (30)

 

2.05

m

-53,468 (28)

8,054.2 (1.7)

B+

100

168Hf

167.940568 (30)

 

25.95

m

-55,361 (28)

8,065.6 (1.7)

EC~98

 

169Hf

168.941259 (30)

 

3.24

m

-54,717 (28)

8,061.8 (1.6)

B+

100

170Hf

169.939609 (30)

 

16.01

h

-56,254 (28)

8,070.9 (1.6)

EC

100

171Hf

170.940492 (31)

 

12.1

h

-55,431 (29)

8,066.1 (1.7)

B+

100

172Hf

171.939448 (26)

 

1.87

y

-56,404 (24)

8,071.8 (1.4)

EC

173Hf

172.940513 (30)

 

23.6

h

-55,412 (28)

8,066.0 (1.6)

B+

100

174Hf

173.9400462 (30)

0.16 (1)

2

Py

-55,846.6 (2.8)

8,068.55 (1.6)

 

 

175Hf

174.9415092 (30)

 

70

d

-54,483.8 (2.8)

8,060.77 (1.6)

EC

100

176Hf

175.9414086 (24)

5.26 (7)

stable

 

-54,577.5 (2.2)

8,061.37 (1.3)

 

 

177Hf

176.9432207 (23)

18.60 (9)

stable

 

-52,889.6 (2.1)

8,051.89 (1.2)

 

 

178Hf

177.9436988 (23)

27.28 (7)

stable

 

-52,444.3 (2.1)

8,049.49 (1.2)

 

 

179Hf

178.9458161 (23)

13.62 (2)

stable

 

-50,471.9 (2.1)

8,038.60 (1.2)

 

 

180Hf

179.9465500 (23)

35.08 (16)

stable

 

-49,788.4 (2.1)

8,034.98 (1.2)

 

 

181Hf

180.9491012 (23)

 

42.39

d

-47,411.9 (2.1)

8,022.05 (1.2)

B-

100

182Hf

181.9505541 (68)

 

9

My

-46,058.6 (6.4)

8,014.89 (3.5)

B-

100

183Hf

182.953530 (32)

 

1.067

h

-43,286 (30)

8,000.0 (1.6)

B-

100

184Hf

183.955447 (43)

 

4.12

h

-41,501 (40)

7,990.7 (2.2)

B-

100

185Hf

184.95882 (21)

 

3.5

m

-38,360 (200)

7,974 (1)

B-

100

186Hf

185.96089 (32)

 

2.6

m

-36,430 (300)

7,964 (2)

B-

100

187Hf

186.96459 (43)

 

30

s

-32,980 (400)

7,946 (2)

B- ?

 

188Hf

187.96685 (54)

 

20

s

-30,880 (500)

7,936 (3)

B- ?

 

153mHf

152.97069 (54)

 

500

ms

-27,300 (500)

7,882 (3)

B+ ?

 

156mHf

155.95936 (22)

 

480

us

-37,850 (210)

7,953 (1.3)

A

100

171mHf

170.940492 (31)

 

29.5

s

-55,431 (29)

8,066.1 (1.7)

IT~100

 

172mHf

171.939448 (26)

 

163

ns

-56,404 (24)

8,071.8 (1.4)

0

 

174mHf

173.9400462 (30)

 

2.39

us

-55,846.6 (2.8)

8,068.55 (1.6)

IT

100

177mHf

176.9432207 (23)

 

1.09

s

-52,889.6 (2.1)

8,051.89 (1.2)

IT

100

178mHf

177.9436988 (23)

 

4

s

-52,444.3 (2.1)

8,049.49 (1.2)

IT

100

179mHf

178.9458161 (23)

 

18.67

s

-50,471.9 (2.1)

8,038.60 (1.2)

IT

100

180mHf

179.9465500 (23)

 

5.5

h

-49,788.4 (2.1)

8,034.98 (1.2)

IT~100

 

181mHf

180.9491012 (23)

 

80

us

-47,411.9 (2.1)

8,022.05 (1.2)

IT

100

182mHf

181.9505541 (68)

 

61.5

m

-46,058.6 (6.4)

8,014.89 (3.5)

B-

58 3

184mHf

183.955447 (43)

 

48

s

-41,501 (40)

7,990.7 (2.2)

B-

100

177m1Hf

176.9432207 (23)

 

51.4

m

-52,889.6 (2.1)

8,051.89 (1.2)

IT

100

178m1Hf

177.9436988 (23)

 

31

y

-52,444.3 (2.1)

8,049.49 (1.2)

IT

100

179m1Hf

178.9458161 (23)

 

25.05

d

-50,471.9 (2.1)

8,038.60 (1.2)

IT

100

181m1Hf

180.9491012 (23)

 

~100

us

-47,411.9 (2.1)

8,022.05 (1.2)

IT

100

177m2Hf

176.9432207 (23)

 

55.9

us

-52,889.6 (2.1)

8,051.89 (1.2)

IT

100

178m2Hf

177.9436988 (23)

 

68

us

-52,444.3 (2.1)

8,049.49 (1.2)

IT

100

181m2Hf

180.9491012 (23)

 

1.5

ms

-47,411.9 (2.1)

8,022.05 (1.2)

IT

100

Data Source: ENSDF March 2005

©Radiochemistry Society 2005