Fundamental Physical Constants Mohr, P.; Taylor, B. 5

Page 1

Table of the Isotopes

11-134 Elem. or Isot. 158 159

160 161

Gd Gd

Gd Gd

Natural Abundance (Atom %) 24.84(7)

21.86(19)

Atomic Mass or Weight

Half-life/ Resonance Width (MeV)

Decay Mode/ Energy (/MeV)

157.924104 158.926389

18.6 h

β- 0.971

159.927054 160.929669

> 1.9 × 1019 y 3.66 m

β- ββ- /1.956

162

Gd

161.930985

8.4 m

β- /1.39

163

Gd

162.9340

1.13 m

β- /3.1

Gd Gd 166 Gd 167 Gd 168 Gd 169 Gd

163.9359 164.9394 165.942 166.946 167.948 168.953

45. s 10 s ~ 4.8 s

β- /2.3 β-

164 165

65

Tb

158.92535(2)

Tb Tb 139 Tb

137.9532 138.9483

135 138

0.9 ms

p

2.4 s

β+, EC/11

Tb Tb 142m Tb 142 Tb 143 Tb 144m Tb 144 Tb 145m Tb

140.9415

3.5 s 25 μs 0.30 s 0.60 s 12. s 4.1 s < 1.5 s 30. s

β+, EC/~ 8.3

Tb Tb

144.9293

Tb Tb

145.92725

Tb

146.92405

142m2

145

146m

146

147m

147

Tb

148m

487_S11.indb 134

141.9387 142.9351 143.93305

0+ 3/2-

1.56/85

0+ 5/2-

1.0/

0+

Nuclear Elect. Magnetic Quadr. Mom. (nm) Mom. (b) -0.44

γ-Energy / Intensity (MeV/%) Tb k x-ray 0.36351 0.058-0.855 Tb k x-ray 0.1023 0.3149 0.3609 0.4030 0.4421 0.2868 0.214 1.685

0+ 0+

(0.040-1.015)

p/1.179

1.6 s

139.946

141

0.971/58 0.913/29 0.607/12

Spin (h/2 π)

0+

Tb

140

Particle Energy/ Intensity (MeV/%)

0.109 0.120 0.329 0.355–0.740

β+, EC/ β+, EC/10. β+, EC/7.4 IT β+, EC/8.4 β+, EC/~ 6.6

40+ 11/251+ 11/2-

β+, EC/6.5 β+ /76 / EC/24 /

½+ (5-)

~ 8. s 1.8 m

β+ /8.1 β+ /35 / EC/65 /

1+ 11/2-

1.6 h

β+ /42 /4.61 EC/58 /

5/2+

2.3 m

β+ /25 / EC/75 /

9+

23. s

ann.rad./ 0.2577 0.5370 0.9876 ann.rad./ Gd k x-ray 1.0789 1.5795

+1.70

ann.rad./ Gd k x-ray 1.3977 1.7978 ann.rad./ Gd k x-ray 0.6944 1.1522 (0.120–3.318) ann.rad./ Gd k x-ray 0.3945 0.6319 0.7845

4/17/06 11:00:06 AM


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