''' 氙 '''(原子質量單位:131.293(6) )的同位素

==圖表==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" |符號
! Z(p)
! N(n)
! 原子質量單位)
! rowspan="2" | 半衰期
! rowspan="2" | 原子核自旋
! rowspan="2" | 相對豐度
! rowspan="2" | 相對豐度的變化率
|-
! colspan="3" | 激發能量
|-
| <sup>110</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 56
| 109.94428(14)
| 310(190) ms [105(+35-25) ms]
| 0+
|
|
|-
| <sup>111</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 57
| 110.94160(33)#
| 740(200) ms
| 5/2+#
|
|
|-
| <sup>112</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 58
| 111.93562(11)
| 2.7(8) s
| 0+
|
|
|-
| <sup>113</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 59
| 112.93334(9)
| 2.74(8) s
| (5/2+)#
|
|
|-
| <sup>114</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 60
| 113.927980(12)
| 10.0(4) s
| 0+
|
|
|-
| <sup>115</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 61
| 114.926294(13)
| 18(4) s
| (5/2+)
|
|
|-
| <sup>116</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 62
| 115.921581(14)
| 59(2) s
| 0+
|
|
|-
| <sup>117</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 63
| 116.920359(11)
| 61(2) s
| 5/2(+)
|
|
|-
| <sup>118</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 64
| 117.916179(11)
| 3.8(9) min
| 0+
|
|
|-
| <sup>119</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 65
| 118.915411(11)
| 5.8(3) min
| 5/2(+)
|
|
|-
| <sup>120</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 66
| 119.911784(13)
| 40(1) min
| 0+
|
|
|-
| <sup>121</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 67
| 120.911462(12)
| 40.1(20) min
| (5/2+)
|
|
|-
| <sup>122</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 68
| 121.908368(12)
| 20.1(1) h
| 0+
|
|
|-
| <sup>123</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 69
| 122.908482(10)
| 2.08(2) h
| 1/2+
|
|
|-
| style="text-indent:1em" | <sup>123m</sup>Xe
| colspan="3" style="text-indent:2em" | 185.18(22) keV
| 5.49(26) µs
| 7/2(-)
|
|
|-
| <sup>124</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 70
| 123.905893(2)
| 穩定 [>48E+15 a]
| 0+
| 0.000952(3)
|
|-
| <sup>125</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 71
| 124.9063955(20)
| 16.9(2) h
| 1/2(+)
|
|
|-
| style="text-indent:1em" | <sup>125m1</sup>Xe
| colspan="3" style="text-indent:2em" | 252.60(14) keV
| 56.9(9) s
| 9/2(-)
|
|
|-
| style="text-indent:1em" | <sup>125m2</sup>Xe
| colspan="3" style="text-indent:2em" | 295.86(15) keV
| 0.14(3) µs
| 7/2(+)
|
|
|-
| <sup>126</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 72
| 125.904274(7)
| 穩定
| 0+
| 0.000890(2)
|
|-
| <sup>127</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 73
| 126.905184(4)
| 36.345(3) d
| 1/2+
|
|
|-
| style="text-indent:1em" | <sup>127m</sup>Xe
| colspan="3" style="text-indent:2em" | 297.10(8) keV
| 69.2(9) s
| 9/2-
|
|
|-
| <sup>128</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 74
| 127.9035313(15)
| 穩定
| 0+
| 0.019102(8)
|
|-
| <sup>129</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 75
| 128.9047794(8)
| 穩定
| 1/2+
| 0.264006(82)
|
|-
| style="text-indent:1em" | <sup>129m</sup>Xe
| colspan="3" style="text-indent:2em" | 236.14(3) keV
| 8.88(2) d
| 11/2-
|
|
|-
| <sup>130</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 76
| 129.9035080(8)
| STABLE
| 0+
| 0.040710(13)
|
|-
| <sup>131</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 77
| 130.9050824(10)
| 穩定
| 3/2+
| 0.212324(30)
|
|-
| style="text-indent:1em" | <sup>131m</sup>Xe
| colspan="3" style="text-indent:2em" | 163.930(8) keV
| 11.934(21) d
| 11/2-
|
|
|-
| <sup>132</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 78
| 131.9041535(10)
| 穩定
| 0+
| 0.269086(33)
|
|-
| style="text-indent:1em" | <sup>132m</sup>Xe
| colspan="3" style="text-indent:2em" | 2752.27(17) keV
| 8.39(11) ms
| (10+)
|
|
|-
| <sup>133</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 79
| 132.9059107(26)
| 5.2475(5) d
| 3/2+
|
|
|-
| style="text-indent:1em" | <sup>133m</sup>Xe
| colspan="3" style="text-indent:2em" | 233.221(18) keV
| 2.19(1) d
| 11/2-
|
|
|-
| <sup>134</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 80
| 133.9053945(9)
| 穩定 [>11E+15 a]
| 0+
| 0.104357(21)
|
|-
| style="text-indent:1em" | <sup>134m1</sup>Xe
| colspan="3" style="text-indent:2em" | 1965.5(5) keV
| 290(17) ms
| 7-
|
|
|-
| style="text-indent:1em" | <sup>134m2</sup>Xe
| colspan="3" style="text-indent:2em" | 3025.2(15) keV
| 5(1) µs
| (10+)
|
|
|-
| <sup>135</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 81
| 134.907227(5)
| 9.14(2) h
| 3/2+
|
|
|-
| style="text-indent:1em" | <sup>135m</sup>Xe
| colspan="3" style="text-indent:2em" | 526.551(13) keV
| 15.29(5) min
| 11/2-
|
|
|-
| <sup>136</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 82
| 135.907219(8)
| STABLE [>10E+21 a]
| 0+
| 0.088573(44)
|
|-
| style="text-indent:1em" | <sup>136m</sup>Xe
| colspan="3" style="text-indent:2em" | 1891.703(14) keV
| 2.95(9) µs
| 6+
|
|
|-
| <sup>137</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 83
| 136.911562(8)
| 3.818(13) min
| 7/2-
|
|
|-
| <sup>138</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 84
| 137.91395(5)
| 14.08(8) min
| 0+
|
|
|-
| <sup>139</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 85
| 138.918793(22)
| 39.68(14) s
| 3/2-
|
|
|-
| <sup>140</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 86
| 139.92164(7)
| 13.60(10) s
| 0+
|
|
|-
| <sup>141</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 87
| 140.92665(10)
| 1.73(1) s
| 5/2(-#)
|
|
|-
| <sup>142</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 88
| 141.92971(11)
| 1.22(2) s
| 0+
|
|
|-
| <sup>143</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 89
| 142.93511(21)#
| 0.511(6) s
| 5/2-
|
|
|-
| <sup>144</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 90
| 143.93851(32)#
| 0.388(7) s
| 0+
|
|
|-
| <sup>145</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 91
| 144.94407(32)#
| 188(4) ms
| (3/2-)#
|
|
|-
| <sup>146</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 92
| 145.94775(43)#
| 146(6) ms
| 0+
|
|
|-
| <sup>147</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 93
| 146.95356(43)#
| 130(80) ms [0.10(+10-5) s]
| 3/2-#
|
|
|}

'''備註:'''畫上#號的數據代表沒有經過實驗的証明，只是理論推測而已，而用括號括起來的代表數據不確定性。

Naturally occurring '''stable isotopes.  (<sup>124</sup>Xe, <sup>134</sup>Xe and <sup>136</sup>Xe are predicted to undergo double beta decay, but this has never been observed, so they are considered to be stable.)<ref>[http://www.shef.ac.uk/physics/bus2006/talks/luscher_roland.pdf Status of ßß-decay in Xenon], Roland Lüscher, accessed on line September 17, 2007.</ref><ref>[http://dx.doi.org/10.1023/A:1015369612904 Average (Recommended) Half-Life Values for Two-Neutrino Double-Beta Decay], A. S. Barabash, ''Czechoslovak Journal of Physics'' '''52''', #4 (April 2002), pp. 567&ndash;573.</ref>  Xenon has the second highest number of stable isotopes. Only tin, with 10 stable isotopes, has more.<ref>{{cite book
 | first=J. B. | last=Rajam | year=1960
 | title=Atomic Physics | edition=7th edition
 | publisher=S. Chand and Co. | location=Delhi
 | id=ISBN 812191809X }}</ref>  Beyond these stable forms, there are over 40 unstable isotopes that have been studied.  <sup>129</sup>Xe is produced by I (fission products of both <sup>235</sup>U and <sup>239</sup>Pu, and therefore used as indicators of nuclear explosions.

The artificial isotope <sup>135</sup>Xe is of considerable significance in the operation of nuclear fission reactors. <sup>135</sup>Xe has a huge cross section for barns, so it acts as a poison" that can slow or stop the chain reaction after a period of operation. This was discovered in the earliest nuclear reactors built by the American Manhattan Project for plutonium production. Fortunately the designers had made provisions in the design to increase the reactor's reactivity (the number of neutrons per fission that go on to fission other atoms of nuclear fuel). 

Relatively high concentrations of radioactive xenon isotopes are also found emanating from nuclear reactors due to the release of this fission gas from cracked fuel rods or fissioning of uranium in cooling water.  The concentrations of these isotopes are still usually low compared to naturally occurring radioactive noble gases such as <sup>222</sup>Rn.

Because xenon is a tracer for two parent isotopes, Xe isotope ratios in dating gives the time elapsed between mantle-derived gases soon after Earth's formation.<ref>{{cite journal
  | last = Boulos
  | first = M.S.
  | authorlink = 
  | coauthors = Manuel, O.K.
  | title = The xenon record of extinct radioactivities in the Earth.
  | journal = Science
  | volume = 174
  | issue = 
  | pages = 1334–1336
  | publisher = 
  | year = 1971
  | url = 
  | doi = 
  | id = 
  | accessdate =  }}</ref>
<br />Standard atomic mass: 131.293(6) u

== Table ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | nuclide<br />symbol
! Z(p)
! N(n)
! &nbsp;<br />isotopic mass (u)<br />&nbsp;
! rowspan="2" | half-life
! rowspan="2" | nuclear<br />spin
! rowspan="2" | representative<br />isotopic<br />composition<br />(mole fraction)
! rowspan="2" | range of natural<br />variation<br />(mole fraction)
|-
! colspan="3" | excitation energy
|-
| <sup>110</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 56
| 109.94428(14)
| 310(190) ms [105(+35-25) ms]
| 0+
|
|
|-
| <sup>111</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 57
| 110.94160(33)#
| 740(200) ms
| 5/2+#
|
|
|-
| <sup>112</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 58
| 111.93562(11)
| 2.7(8) s
| 0+
|
|
|-
| <sup>113</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 59
| 112.93334(9)
| 2.74(8) s
| (5/2+)#
|
|
|-
| <sup>114</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 60
| 113.927980(12)
| 10.0(4) s
| 0+
|
|
|-
| <sup>115</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 61
| 114.926294(13)
| 18(4) s
| (5/2+)
|
|
|-
| <sup>116</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 62
| 115.921581(14)
| 59(2) s
| 0+
|
|
|-
| <sup>117</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 63
| 116.920359(11)
| 61(2) s
| 5/2(+)
|
|
|-
| <sup>118</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 64
| 117.916179(11)
| 3.8(9) min
| 0+
|
|
|-
| <sup>119</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 65
| 118.915411(11)
| 5.8(3) min
| 5/2(+)
|
|
|-
| <sup>120</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 66
| 119.911784(13)
| 40(1) min
| 0+
|
|
|-
| <sup>121</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 67
| 120.911462(12)
| 40.1(20) min
| (5/2+)
|
|
|-
| <sup>122</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 68
| 121.908368(12)
| 20.1(1) h
| 0+
|
|
|-
| <sup>123</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 69
| 122.908482(10)
| 2.08(2) h
| 1/2+
|
|
|-
| style="text-indent:1em" | <sup>123m</sup>Xe
| colspan="3" style="text-indent:2em" | 185.18(22) keV
| 5.49(26) µs
| 7/2(-)
|
|
|-
| <sup>124</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 70
| 123.905893(2)
| STABLE [>48E+15 a]
| 0+
| 0.000952(3)
|
|-
| <sup>125</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 71
| 124.9063955(20)
| 16.9(2) h
| 1/2(+)
|
|
|-
| style="text-indent:1em" | <sup>125m1</sup>Xe
| colspan="3" style="text-indent:2em" | 252.60(14) keV
| 56.9(9) s
| 9/2(-)
|
|
|-
| style="text-indent:1em" | <sup>125m2</sup>Xe
| colspan="3" style="text-indent:2em" | 295.86(15) keV
| 0.14(3) µs
| 7/2(+)
|
|
|-
| <sup>126</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 72
| 125.904274(7)
| STABLE
| 0+
| 0.000890(2)
|
|-
| <sup>127</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 73
| 126.905184(4)
| 36.345(3) d
| 1/2+
|
|
|-
| style="text-indent:1em" | <sup>127m</sup>Xe
| colspan="3" style="text-indent:2em" | 297.10(8) keV
| 69.2(9) s
| 9/2-
|
|
|-
| <sup>128</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 74
| 127.9035313(15)
| STABLE
| 0+
| 0.019102(8)
|
|-
| <sup>129</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 75
| 128.9047794(8)
| STABLE
| 1/2+
| 0.264006(82)
|
|-
| style="text-indent:1em" | <sup>129m</sup>Xe
| colspan="3" style="text-indent:2em" | 236.14(3) keV
| 8.88(2) d
| 11/2-
|
|
|-
| <sup>130</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 76
| 129.9035080(8)
| STABLE
| 0+
| 0.040710(13)
|
|-
| <sup>131</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 77
| 130.9050824(10)
| STABLE
| 3/2+
| 0.212324(30)
|
|-
| style="text-indent:1em" | <sup>131m</sup>Xe
| colspan="3" style="text-indent:2em" | 163.930(8) keV
| 11.934(21) d
| 11/2-
|
|
|-
| <sup>132</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 78
| 131.9041535(10)
| STABLE
| 0+
| 0.269086(33)
|
|-
| style="text-indent:1em" | <sup>132m</sup>Xe
| colspan="3" style="text-indent:2em" | 2752.27(17) keV
| 8.39(11) ms
| (10+)
|
|
|-
| <sup>133</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 79
| 132.9059107(26)
| 5.2475(5) d
| 3/2+
|
|
|-
| style="text-indent:1em" | <sup>133m</sup>Xe
| colspan="3" style="text-indent:2em" | 233.221(18) keV
| 2.19(1) d
| 11/2-
|
|
|-
| <sup>134</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 80
| 133.9053945(9)
| STABLE [>11E+15 a]
| 0+
| 0.104357(21)
|
|-
| style="text-indent:1em" | <sup>134m1</sup>Xe
| colspan="3" style="text-indent:2em" | 1965.5(5) keV
| 290(17) ms
| 7-
|
|
|-
| style="text-indent:1em" | <sup>134m2</sup>Xe
| colspan="3" style="text-indent:2em" | 3025.2(15) keV
| 5(1) µs
| (10+)
|
|
|-
| <sup>135</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 81
| 134.907227(5)
| 9.14(2) h
| 3/2+
|
|
|-
| style="text-indent:1em" | <sup>135m</sup>Xe
| colspan="3" style="text-indent:2em" | 526.551(13) keV
| 15.29(5) min
| 11/2-
|
|
|-
| <sup>136</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 82
| 135.907219(8)
| STABLE [>10E+21 a]
| 0+
| 0.088573(44)
|
|-
| style="text-indent:1em" | <sup>136m</sup>Xe
| colspan="3" style="text-indent:2em" | 1891.703(14) keV
| 2.95(9) µs
| 6+
|
|
|-
| <sup>137</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 83
| 136.911562(8)
| 3.818(13) min
| 7/2-
|
|
|-
| <sup>138</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 84
| 137.91395(5)
| 14.08(8) min
| 0+
|
|
|-
| <sup>139</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 85
| 138.918793(22)
| 39.68(14) s
| 3/2-
|
|
|-
| <sup>140</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 86
| 139.92164(7)
| 13.60(10) s
| 0+
|
|
|-
| <sup>141</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 87
| 140.92665(10)
| 1.73(1) s
| 5/2(-#)
|
|
|-
| <sup>142</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 88
| 141.92971(11)
| 1.22(2) s
| 0+
|
|
|-
| <sup>143</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 89
| 142.93511(21)#
| 0.511(6) s
| 5/2-
|
|
|-
| <sup>144</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 90
| 143.93851(32)#
| 0.388(7) s
| 0+
|
|
|-
| <sup>145</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 91
| 144.94407(32)#
| 188(4) ms
| (3/2-)#
|
|
|-
| <sup>146</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 92
| 145.94775(43)#
| 146(6) ms
| 0+
|
|
|-
| <sup>147</sup>Xe
| style="text-align:right" | 54
| style="text-align:right" | 93
| 146.95356(43)#
| 130(80) ms [0.10(+10-5) s]
| 3/2-#
|
|
|}