Изотопи на цериумот

Во природата цериумот (<sub>58</sub>Ce) е составен од 4 стабилни изотопи: <sup>136</sup>Ce, <sup>138</sup>Ce, <sup>140</sup>Ce и <sup>142</sup>Ce, при што <sup>140</sup>Ce е најзастапен (88,48% природна застапеност) и единствениот теоретски стабилен. Се предвидува дека <sup>136</sup>Ce, <sup>138</sup>Ce и <sup>142</sup>Ce ќе претрпат двоен бета-распад, но овој процес никогаш не бил забележан. Има 35 радиоизотопи со определени одлики, при што најстабилен е <sup>144</sup>Ce, со време на полураспад од 284.893 дена, <sup>139</sup> Ce, со време на полураспад од 137.640 дена и <sup>141</sup>Ce, со време на полураспад од 32.501 дена. Сите преостанати радиоактивни изотопи имаат време на полураспад помало од 4 дена, а повеќето од нив имаат време на полураспад помало од 10 минути. Овој елемент има и 10 мета-состојби.
Изотопите на цериумот се движат по атомска тежина од 119 u (<sup>119</sup>Ce) до 157 u (<sup>157</sup>Ce).
1 Список на изотопи
<sup>121</sup>Ce, 58, 63, 120,94344(43)#, 1,1(1) с, β<sup>+</sup> (99%), <sup>121</sup>La, 5/2(+#)
β<sup>+</sup>, p (1%), <sup>121</sup>La
<sup>122</sup>Ce, 58, 64, 121,93787(43)#, 2# с, β<sup>+</sup>, <sup>122</sup>La, 0+
<sup>123</sup>Ce, 58, 65, 122,93528(32)#, 3,8(2) с, β<sup>+</sup> (?%), <sup>123</sup>La, (5/2)(+#)
β<sup>+</sup>, p (?%), <sup>122</sup>Ba
<sup>124</sup>Ce, 58, 66, 123,93031(32)#, 9,1(12) с, β<sup>+</sup>, <sup>124</sup>La, 0+
<sup>125</sup>Ce, 58, 67, 124,92844(21)#, 9,7(3) с, β<sup>+</sup> (?%), <sup>125</sup>La, (7/2−)
β<sup>+</sup>, p (?%), <sup>124</sup>Ba
<sup>125m</sup>Ce, 93,6(4) keV, 13(10) с, IT, <sup>125</sup>Ce, (1/2+)
<sup>126</sup>Ce, 58, 68, 125,923971(30), 51,0(3) с, β<sup>+</sup>, <sup>126</sup>La, 0+
<sup>127</sup>Ce, 58, 69, 126,922727(31), 34(2) с, β<sup>+</sup>, <sup>127</sup>La, (1/2+)
<sup>127m1</sup>Ce, 7,3(11) keV, 28,6(7) с, β<sup>+</sup>, <sup>127</sup>La, (5/2+)
<sup>127m2</sup>Ce, 36,9(11) keV, >10 μs, IT, <sup>127</sup>Ce, (7/2−)
<sup>128</sup>Ce, 58, 70, 127,918911(30), 3,93(2) мин, β<sup>+</sup>, <sup>128</sup>La, 0+
<sup>129</sup>Ce, 58, 71, 128,918102(30), 3,5(3) мин, β<sup>+</sup>, <sup>129</sup>La, (5/2+)
<sup>130</sup>Ce, 58, 72, 129,914736(30), 22,9(5) мин, β<sup>+</sup>, <sup>130</sup>La, 0+
<sup>130m</sup>Ce, 2453,6(3) keV, 100(8) нс, IT, <sup>130</sup>Ce, 7−
<sup>131</sup>Ce, 58, 73, 130,914429(35), 10,3(3) мин, β<sup>+</sup>, <sup>131</sup>La, 7/2+
<sup>131m</sup>Ce, 63,09(9) keV, 5,4(4) мин, β<sup>+</sup>, <sup>131</sup>La, (1/2+)
<sup>132</sup>Ce, 58, 74, 131,911466(22), 3,51(11) ч, β<sup>+</sup>, <sup>132</sup>La, 0+
<sup>132m</sup>Ce, 2341,15(21) keV, 9,4(3) мс, IT, <sup>132</sup>Ce, 8−
<sup>133</sup>Ce, 58, 75, 132,911520(18), 97(4) мин, β<sup>+</sup>, <sup>133</sup>La, 1/2+
<sup>133m</sup>Ce, 37,2(7) keV, 5,1(3) ч, β<sup>+</sup>, <sup>133</sup>La, 9/2−
<sup>134</sup>Ce, 58, 76, 133,908928(22), 3,16(4) д, EC, <sup>134</sup>La, 0+
<sup>134m</sup>Ce, 3208,6(4) keV, 308(5) нс, IT, <sup>134</sup>Ce, 10+
<sup>135</sup>Ce, 58, 77, 134,909161(11), 17,7(3) ч, β<sup>+</sup>, <sup>135</sup>La, 1/2+
<sup>135m</sup>Ce, 445,81(21) keV, 20(1) с, IT, <sup>135</sup>Ce, (11/2−)
<sup>136</sup>Ce, 58, 78, 135,90712926(35), Опсервациски стабилен, 0+, 0,00186(2)
<sup>136m</sup>Ce, 3095,0(6) keV, 1,96(9) μs, IT, <sup>136</sup>Ce, 10+
<sup>137</sup>Ce, 58, 79, 136,90776242(39), 9,0(3) ч, β<sup>+</sup>, <sup>137</sup>La, 3/2+
<sup>137m</sup>Ce, 254,29(5) keV, 34,4(3) ч, IT (99,21%), <sup>137</sup>Ce, 11/2−
β<sup>+</sup> (0,79%), <sup>137</sup>La
<sup>138</sup>Ce, 58, 80, 137,90599418(54), Опсервациски стабилен, 0+, 0,00251(2)
<sup>138m</sup>Ce, 2129,28(12) keV, 8,73(20) мс, IT, <sup>138</sup>Ce, 7-
<sup>139</sup>Ce, 58, 81, 138,9066470(22), 137,642(20) д, EC, <sup>139</sup>La, 3/2+
<sup>139m</sup>Ce, 754,24(8) keV, 57,58(32) с, IT, <sup>139</sup>Ce, 11/2−
<sup>140</sup>Ce, 58, 82, 139,9054484(14), Стабилен, 0+, 0,88449(51)
<sup>140m</sup>Ce, 2107,854(24) keV, 7,3(15) μs, IT, <sup>140</sup>Ce, 6+
<sup>141</sup>Ce, 58, 83, 140,9082860(14), 32,505(10) д, β<sup>−</sup>, <sup>141</sup>Pr, 7/2−
<sup>142</sup>Ce, 58, 84, 141,9092502(26), Опсервациски стабилен, 0+, 0,11114(51)
<sup>143</sup>Ce, 58, 85, 142,9123920(26), 33,039(6) ч, β<sup>−</sup>, <sup>143</sup>Pr, 3/2−
<sup>144</sup>Ce, 58, 86, 143,9136528(30), 284,886(25) д, β<sup>−</sup>, <sup>144</sup>Pr, 0+
<sup>145</sup>Ce, 58, 87, 144,917265(36), 3,01(6) мин, β<sup>−</sup>, <sup>145</sup>Pr, 5/2−#
<sup>146</sup>Ce, 58, 88, 145,918812(16), 13,49(16) мин, β<sup>−</sup>, <sup>146</sup>Pr, 0+
<sup>147</sup>Ce, 58, 89, 146,9226899(92), 56,4(10) с, β<sup>−</sup>, <sup>147</sup>Pr, (5/2−)
<sup>148</sup>Ce, 58, 90, 147,924424(12), 56,8(3) с, β<sup>−</sup>, <sup>148</sup>Pr, 0+
<sup>149</sup>Ce, 58, 91, 148,928427(11), 4,94(4) с, β<sup>−</sup>, <sup>149</sup>Pr, 3/2−#
<sup>150</sup>Ce, 58, 92, 149,930384(13), 6,05(7) с, β<sup>−</sup>, <sup>150</sup>Pr, 0+
<sup>151</sup>Ce, 58, 93, 150,934272(19), 1,76(6) с, β<sup>−</sup>, <sup>151</sup>Pr, (3/2−)
<sup>152</sup>Ce, 58, 94, 151,93668(22)#, 1,42(2) с, β<sup>−</sup>, <sup>152</sup>Pr, 0+
<sup>153</sup>Ce, 58, 95, 152,94105(22)#, 865(25) мс, β<sup>−</sup>, <sup>153</sup>Pr, 3/2−#
<sup>154</sup>Ce, 58, 96, 153,94394(22)#, 722(14) мс, β<sup>−</sup>, <sup>154</sup>Pr, 0+
<sup>155</sup>Ce, 58, 97, 154,94871(32)#, 313(7) мс, β<sup>−</sup>, <sup>155</sup>Pr, 5/2−#
<sup>156</sup>Ce, 58, 98, 155,95188(32)#, 233(9) мс, β<sup>−</sup>, <sup>156</sup>Pr, 0+
<sup>157</sup>Ce, 58, 99, 156,95713(43)#, 175(41) мс, β<sup>−</sup>, <sup>157</sup>Pr, 7/2+#
<sup>158</sup>Ce, 58, 100, 157,96077(43)#, 99(93) мс, β<sup>−</sup>, <sup>158</sup>Pr, 0+
2 Наводи
* Isotope masses from:
*** Isotopic compositions and standard atomic masses from:
***** Half-life, spin, and isomer data selected from the following sources.
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