Isotopes of Selenium

List of known isotopes of the element Selenium.

Isotope%Spin/parityRadiusIsotopic massDiscovery
63Se13.2 ±39 mssyn.6.298·107 ±537 keV/c22016
64Sestab.syn.0+6.397·107 ±537 keV/c22005
65Se33 ±4 mssyn.(3/2-)6.496·107 ±322 keV/c21993
66Se42 ±12 mssyn.0+6.595·107 ±215 keV/c21993
67Se133 ±4 mssyn.(5/2-)6.694·107 ±72 keV/c21991
68Se35.5 ±7 ssyn.0+6.794·107 ±0.532 keV/c21990
69Se27.4 ±2 ssyn.1/2-6.893·107 ±1.599 keV/c21974
70Se41.1 ±3 msyn.0+6.993·107 ±1.7 keV/c21950
71Se4.74 ±5 msyn.(5/2-)7.093·107 ±3 keV/c21957
72Se8.4 ±8 dsyn.0+7.192·107 ±2.1 keV/c21948
73Se7.15 ±9 hsyn.9/2+7.292·107 ±7.969 keV/c21948
74Sestab.0.86 ±0.03 %0+4.07 ±0.02 fm7.392·107 ±0.015 keV/c21922
75Se119.7 ±5 dsyn.5/2+7.492·107 ±0.078 keV/c21947
76Sestab.9.23 ±0.07 %0+4.139 ±0.0016 fm7.591·107 ±0.017 keV/c21922
77Sestab.7.6 ±0.07 %1/2-4.139 ±0.0018 fm7.691·107 ±0.067 keV/c21922
78Sestab.23.69 ±0.22 %0+4.14 ±0.0017 fm7.791·107 ±0.191 keV/c21922
79Se327,000 ±28 asyn.7/2+7.891·107 ±0.238 keV/c21950
80Sestab.49.8 ±0.36 %0+4.14 ±0.0018 fm7.991·107 ±1.016 keV/c21922
81Se18.45 ±12 msyn.1/2-8.091·107 ±1.049 keV/c21948
82Se9.6·1019 ±10 a8.82 ±0.15 %0+4.14 ±0.0019 fm8.191·107 ±0.5 keV/c21922
83Se22.3 ±2 msyn.9/2+8.291·107 ±3.259 keV/c21937
84Se3.26 ±10 msyn.0+8.391·107 ±2.105 keV/c21960
85Se32.9 ±3 ssyn.(5/2)+8.492·107 ±2.804 keV/c21960
86Se14.3 ±3 ssyn.0+8.592·107 ±2.705 keV/c21973
87Se5.5 ±14 ssyn.(3/2+)8.692·107 ±2.405 keV/c21968
88Se1.53 ±6 ssyn.0+8.793·107 ±3.604 keV/c21970
89Se0.43 ±5 ssyn.(5/2+)8.893·107 ±4.003 keV/c21971
90Se195 ± mssyn.0+8.994·107 ±354 keV/c21994
91Se0.27 ±5 ssyn.9.094·107 ±465 keV/c21975
92Sestab.syn.0+9.194·107 ±429 keV/c21997
93Sestab.syn.(1/2+)9.295·107 ±429 keV/c21997
94Se150 nssyn.0+9.396·107 ±537 keV/c21997
95Se392 nssyn.9.496·107 ±537 keV/c22010

63SeSelenium-63

Classificationz: 34; n: 29; m: 63
Half life13.2 ±39 ms
Natural abundancesynthetic nuclide
Decay modeselectron capture + β⁺ decay; electron capture + proton emission; two-proton emission
Discovery2016
Mass excess-16,850 ±500 keV
Binding energy7,917 ±8 keV
Single-particle energy-281 ±583 keV
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64SeSelenium-64

Classificationz: 34; n: 30; m: 64
Half lifestable nuclide
Natural abundancesynthetic nuclide
Spin/parity0+
Discovery2005
Mass excess-26,860 ±500 keV
Binding energy8,075 ±8 keV
Single-particle energy648 ±539 keV
Neutron separation energy18,080 ±707 keV
Q value for electron capture12,670 ±539.6 keV
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65SeSelenium-65

Classificationz: 34; n: 31; m: 65
Half life33 ±4 ms
Natural abundancesynthetic nuclide
Spin/parity(3/2-)
Decay modeselectron capture + β⁺ decay; electron capture + proton emission
Discovery1993
Mass excess-33,020 ±300 keV
Binding energy8,170 ±5 keV
Single-particle energy776 ±362 keV
Neutron separation energy14,230 ±583 keV
Q value for electron capture13,910 ±311.7 keV
β⁻ decay energy-16,530 ±583 keV
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66SeSelenium-66

Classificationz: 34; n: 32; m: 66
Half life42 ±12 ms
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modeselectron capture (EC)
Discovery1993
Mass excess-41,660 ±200 keV
Binding energy8,300 ±3 keV
Single-particle energy2,012 ±217 keV
Neutron separation energy16,710 ±361 keV
Q value for electron capture10,360 ±200 keV
β⁻ decay energy-18,100 ±447 keV
β⁻ decay energy with neutron-33,250 ±539 keV
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67SeSelenium-67

Classificationz: 34; n: 33; m: 67
Half life133 ±4 ms
Natural abundancesynthetic nuclide
Spin/parity(5/2-)
Decay modeselectron capture + β⁺ decay; electron capture + proton emission
Discovery1991
Mass excess-46,590 ±67.06 keV
Binding energy8,369 ±1.001 keV
Single-particle energy1,844 ±67.3 keV
Neutron separation energy12,990 ±211 keV
Q value for electron capture10,000 ±67.06 keV
β⁻ decay energy-14,060 ±307 keV
β⁻ decay energy with neutron-31,090 ±405 keV
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68SeSelenium-68

Classificationz: 34; n: 34; m: 68
Half life35.5 ±7 s
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modeselectron capture + β⁺ decay
Discovery1990
Mass excess-54,190 ±0.496 keV
Binding energy8,477 ±0.0073 keV
Single-particle energy4,891 ±0.6645 keV
Neutron separation energy15,680 ±67.06 keV
Q value for electron capture4,705 ±1.911 keV
β⁻ decay energy-15,400 ±259 keV
β⁻ decay energy with neutron-29,740 ±300 keV
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69SeSelenium-69

Classificationz: 34; n: 35; m: 69
Half life27.4 ±2 s
Natural abundancesynthetic nuclide
Spin/parity1/2-
Decay modeselectron capture + β⁺ decay; electron capture + proton emission
Discovery1974
Mass excess-56,440 ±1.49 keV
Binding energy8,503 ±0.0216 keV
Single-particle energy4,829 ±2.372 keV
Neutron separation energy10,310 ±1.57 keV
Q value for electron capture6,677 ±32.03 keV
β⁻ decay energy-10,180 ±42.02 keV
β⁻ decay energy with neutron-25,720 ±259 keV
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70SeSelenium-70

Classificationz: 34; n: 36; m: 70
Half life41.1 ±3 m
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modeselectron capture + β⁺ decay
Discovery1950
Mass excess-61,930 ±1.584 keV
Binding energy8,576 ±0.0226 keV
Single-particle energy6,106 ±32.03 keV
Neutron separation energy13,560 ±2.174 keV
Q value for electron capture2,404 ±2.112 keV
β⁻ decay energy-10,510 ±14.98 keV
β⁻ decay energy with neutron-23,750 ±42.03 keV
Electric quadrupole moment-0.6 ±0.3 b
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71SeSelenium-71

Classificationz: 34; n: 37; m: 71
Half life4.74 ±5 m
Natural abundancesynthetic nuclide
Spin/parity(5/2-)
Decay modeselectron capture + β⁺ decay
Discovery1957
Mass excess-63,150 ±2.794 keV
Binding energy8,586 ±0.0394 keV
Single-particle energy6,101 ±3.124 keV
Neutron separation energy9,287 ±3.212 keV
Q value for electron capture4,746 ±5.014 keV
β⁻ decay energy-6,645 ±6.082 keV
β⁻ decay energy with neutron-19,800 ±15.16 keV
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72SeSelenium-72

Classificationz: 34; n: 38; m: 72
Half life8.4 ±8 d
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modeselectron capture (EC)
Discovery1948
Mass excess-67,870 ±1.956 keV
Binding energy8,644 ±0.0272 keV
Single-particle energy7,263 ±4.599 keV
Neutron separation energy12,790 ±3.411 keV
Q value for electron capture361.6 ±4.527 keV
β⁻ decay energy-8,807 ±2.208 keV
β⁻ decay energy with neutron-19,440 ±5.745 keV
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73SeSelenium-73

Classificationz: 34; n: 39; m: 73
Half life7.15 ±9 h
Natural abundancesynthetic nuclide
Spin/parity9/2+
Decay modeselectron capture + β⁺ decay
Discovery1948
Mass excess-68,230 ±7.424 keV
Binding energy8,641 ±0.1017 keV
Single-particle energy7,286 ±8.472 keV
Neutron separation energy8,430 ±7.677 keV
Q value for electron capture2,725 ±8.364 keV
β⁻ decay energy-4,582 ±10.02 keV
β⁻ decay energy with neutron-17,240 ±7.494 keV
Magnetic dipole moment0.892 ±0.013 μN
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74SeSelenium-74

Classificationz: 34; n: 40; m: 74
Half lifestable nuclide
Natural abundance0.86 ±0.03 %
Spin/parity0+
Discovery1922
Mass excess-72,220 ±0.015 keV
Binding energy8,687 ±3·10-4 keV
Single-particle energy8,549 ±3.853 keV
Neutron separation energy12,050 ±7.423 keV
Q value for electron capture-1,354 ±1.693 keV
β⁻ decay energy-6,926 ±5.835 keV
β⁻ decay energy with neutron-16,640 ±6.741 keV
Magnetic dipole moment1.7 ±0.3 μN
Electric quadrupole moment-0.36 ±0.07 b
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75SeSelenium-75

Classificationz: 34; n: 41; m: 75
Half life119.7 ±5 d
Natural abundancesynthetic nuclide
Spin/parity5/2+
Decay modeselectron capture (EC)
Discovery1947
Mass excess-72,170 ±0.073 keV
Binding energy8,678 ±0.001 keV
Single-particle energy8,598 ±1.694 keV
Neutron separation energy8,027 ±0.0715 keV
Q value for electron capture864.7 ±0.887 keV
β⁻ decay energy-3,063 ±4.285 keV
β⁻ decay energy with neutron-14,960 ±5.835 keV
Magnetic dipole moment0.683 ±0.01 μN
Electric quadrupole moment1.1 ±0.2 b
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76SeSelenium-76

Classificationz: 34; n: 42; m: 76
Half lifestable nuclide
Natural abundance9.23 ±0.07 %
Spin/parity0+
Discovery1922
Mass excess-75,260 ±0.016 keV
Binding energy8,711 ±3·10-4 keV
Single-particle energy9,506 ±0.8839 keV
Neutron separation energy11,150 ±0.0746 keV
Q value for electron capture-2,961 ±0.886 keV
β⁻ decay energy-4,963 ±9.321 keV
β⁻ decay energy with neutron-14,220 ±4.284 keV
Magnetic dipole moment0.61 ±0.11 μN
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77SeSelenium-77

Classificationz: 34; n: 43; m: 77
Half lifestable nuclide
Natural abundance7.6 ±0.07 %
Spin/parity1/2-
Discovery1922
Mass excess-74,600 ±0.062 keV
Binding energy8,694 ±8·10-4 keV
Single-particle energy9,597 ±0.8879 keV
Neutron separation energy7,418 ±0.0603 keV
Q value for electron capture-683.2 ±1.693 keV
β⁻ decay energy-1,365 ±2.809 keV
β⁻ decay energy with neutron-12,390 ±9.322 keV
Magnetic dipole moment0.5335 ±5·10-5 μN
Electric quadrupole moment0.76 ±0.05 b
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78SeSelenium-78

Classificationz: 34; n: 44; m: 78
Half lifestable nuclide
Natural abundance23.69 ±0.22 %
Spin/parity0+
Discovery1922
Mass excess-77,030 ±0.179 keV
Binding energy8,717 ±0.0023 keV
Single-particle energy10,390 ±1.696 keV
Neutron separation energy10,490 ±0.1684 keV
Q value for electron capture-4,209 ±9.781 keV
β⁻ decay energy-3,574 ±3.575 keV
β⁻ decay energy with neutron-11,870 ±2.815 keV
Magnetic dipole moment0.6 ±0.2 μN
Electric quadrupole moment-0.26 ±0.09 b
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79SeSelenium-79

Classificationz: 34; n: 45; m: 79
Half life327,000 ±28 a
Natural abundancesynthetic nuclide
Spin/parity7/2+
Decay modesβ⁻ decay
Discovery1950
Mass excess-75,920 ±0.223 keV
Binding energy8,695 ±0.0028 keV
Single-particle energy10,380 ±9.781 keV
Neutron separation energy6,962 ±0.1327 keV
Q value for electron capture-2,282 ±5.33 keV
β⁻ decay energy150.6 ±1.018 keV
β⁻ decay energy with neutron-10,540 ±3.577 keV
Magnetic dipole moment-1.018 ±0.015 μN
Electric quadrupole moment0.8 ±0.2 b
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80SeSelenium-80

Classificationz: 34; n: 46; m: 80
Half lifestable nuclide
Natural abundance49.8 ±0.36 %
Spin/parity0+
Discovery1922
Mass excess-77,760 ±0.947 keV
Binding energy8,710 ±0.0118 keV
Single-particle energy11,410 ±5.24 keV
Neutron separation energy9,913 ±0.9653 keV
Q value for electron capture-5,545 ±3.465 keV
β⁻ decay energy-1,871 ±0.3095 keV
β⁻ decay energy with neutron-9,763 ±0.3369 keV
Magnetic dipole moment2.3 ±0.9 μN
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81SeSelenium-81

Classificationz: 34; n: 47; m: 81
Half life18.45 ±12 m
Natural abundancesynthetic nuclide
Spin/parity1/2-
Decay modesβ⁻ decay
Discovery1948
Mass excess-76,390 ±0.977 keV
Binding energy8,685 ±0.0121 keV
Single-particle energy11,460 ±3.447 keV
Neutron separation energy6,700 ±0.3486 keV
Q value for electron capture-3,856 ±2.819 keV
β⁻ decay energy1,588 ±1.378 keV
β⁻ decay energy with neutron-8,572 ±0.4659 keV
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82SeSelenium-82

Classificationz: 34; n: 48; m: 82
Half life9.6·1019 ±10 a
Natural abundance8.82 ±0.15 %
Spin/parity0+
Decay modesdouble β⁻ decay
Discovery1922
Mass excess-77,600 ±0.466 keV
Binding energy8,693 ±0.0057 keV
Single-particle energy12,340 ±2.663 keV
Neutron separation energy9,276 ±0.9619 keV
Q value for electron capture-7,489 ±3.758 keV
β⁻ decay energy-95.22 ±1.076 keV
β⁻ decay energy with neutron-7,689 ±1.082 keV
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83SeSelenium-83

Classificationz: 34; n: 49; m: 83
Half life22.3 ±2 m
Natural abundancesynthetic nuclide
Spin/parity9/2+
Decay modesβ⁻ decay
Discovery1937
Mass excess-75,350 ±3.036 keV
Binding energy8,658 ±0.0366 keV
Single-particle energy12,520 ±4.808 keV
Neutron separation energy5,817 ±3 keV
Q value for electron capture-5,672 ±4.129 keV
β⁻ decay energy3,673 ±4.839 keV
β⁻ decay energy with neutron-5,914 ±3.187 keV
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84SeSelenium-84

Classificationz: 34; n: 50; m: 84
Half life3.26 ±10 m
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modesβ⁻ decay
Discovery1960
Mass excess-75,950 ±1.961 keV
Binding energy8,658 ±0.0233 keV
Single-particle energy13,560 ±3.41 keV
Neutron separation energy8,678 ±3.614 keV
Q value for electron capture-10,100 ±3.728 keV
β⁻ decay energy1,835 ±25.76 keV
β⁻ decay energy with neutron-5,006 ±4.271 keV
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85SeSelenium-85

Classificationz: 34; n: 51; m: 85
Half life32.9 ±3 s
Natural abundancesynthetic nuclide
Spin/parity(5/2)+
Decay modesβ⁻ decay
Discovery1960
Mass excess-72,420 ±2.613 keV
Binding energy8,610 ±0.0307 keV
Single-particle energy13,840 ±4.102 keV
Neutron separation energy4,537 ±3.259 keV
Q value for electron capture-9,225 ±4.038 keV
β⁻ decay energy6,161 ±4.031 keV
β⁻ decay energy with neutron-2,702 ±25.86 keV
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86SeSelenium-86

Classificationz: 34; n: 52; m: 86
Half life14.3 ±3 s
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modesβ⁻ decay
Discovery1973
Mass excess-70,510 ±2.52 keV
Binding energy8,581 ±0.0293 keV
Single-particle energy14,600 ±3.971 keV
Neutron separation energy6,160 ±3.623 keV
Q value for electron capture-11,550 ±4.272 keV
β⁻ decay energy5,129 ±3.971 keV
β⁻ decay energy with neutron0.9851 ±3.971 keV
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87SeSelenium-87

Classificationz: 34; n: 53; m: 87
Half life5.5 ±14 s
Natural abundancesynthetic nuclide
Spin/parity(3/2+)
Decay modesβ⁻ decay; β⁻ decay with neutron emission
Discovery1968
Mass excess-66,430 ±2.241 keV
Binding energy8,529 ±0.0258 keV
Single-particle energy14,750 ±4.108 keV
Neutron separation energy3,994 ±3.365 keV
Q value for electron capture-10,810 ±3.733 keV
β⁻ decay energy7,465 ±3.876 keV
β⁻ decay energy with neutron1,134 ±3.8 keV
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88SeSelenium-88

Classificationz: 34; n: 54; m: 88
Half life1.53 ±6 s
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modesβ⁻ decay; β⁻ decay with neutron emission
Discovery1970
Mass excess-63,890 ±3.357 keV
Binding energy8,495 ±0.0382 keV
Single-particle energy15,550 ±4.486 keV
Neutron separation energy5,529 ±4.03 keV
Q value for electron capture-13,440 ±200 keV
β⁻ decay energy6,831 ±4.612 keV
β⁻ decay energy with neutron1,936 ±4.612 keV
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89SeSelenium-89

Classificationz: 34; n: 55; m: 89
Half life0.43 ±5 s
Natural abundancesynthetic nuclide
Spin/parity(5/2+)
Decay modesβ⁻ decay; β⁻ decay with neutron emission
Discovery1971
Mass excess-59,000 ±3.729 keV
Binding energy8,435 ±0.0419 keV
Single-particle energy15,830 ±200 keV
Neutron separation energy3,179 ±5.012 keV
Q value for electron capture-12,470 ±300 keV
β⁻ decay energy9,281 ±4.951 keV
β⁻ decay energy with neutron3,652 ±4.89 keV
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90SeSelenium-90

Classificationz: 34; n: 56; m: 90
Half life195 ± ms
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modesβ⁻ decay; β⁻ decay with neutron emission
Discovery1994
Mass excess-55,810 ±329.7 keV
Binding energy8,395 ±3.663 keV
Single-particle energy16,550 ±446 keV
Neutron separation energy4,879 ±329.7 keV
Q value for electron capture-14,820 ±518.3 keV
β⁻ decay energy8,200 ±329.7 keV
β⁻ decay energy with neutron4,402 ±329.7 keV
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91SeSelenium-91

Classificationz: 34; n: 57; m: 91
Half life0.27 ±5 s
Natural abundancesynthetic nuclide
Decay modesβ⁻ decay; β⁻ decay with neutron emission
Discovery1975
Mass excess-50,590 ±433.1 keV
Binding energy8,334 ±4.759 keV
Single-particle energy16,870 ±589 keV
Neutron separation energy2,851 ±544.3 keV
Q value for electron capture-14,090 ±589.5 keV
β⁻ decay energy10,520 ±433.1 keV
β⁻ decay energy with neutron5,348 ±433.1 keV
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92SeSelenium-92

Classificationz: 34; n: 58; m: 92
Half lifestable nuclide
Natural abundancesynthetic nuclide
Spin/parity0+
Discovery1997
Mass excess-46,730 ±400 keV
Binding energy8,290 ±4 keV
Single-particle energy17,510 ±565 keV
Neutron separation energy4,215 ±589 keV
Q value for electron capture-16,350 ±640.3 keV
β⁻ decay energy9,509 ±400 keV
β⁻ decay energy with neutron6,312 ±400 keV
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93SeSelenium-93

Classificationz: 34; n: 59; m: 93
Half lifestable nuclide
Natural abundancesynthetic nuclide
Spin/parity(1/2+)
Discovery1997
Mass excess-40,860 ±400 keV
Binding energy8,225 ±4 keV
Single-particle energy17,760 ±640 keV
Neutron separation energy2,208 ±565 keV
β⁻ decay energy12,030 ±588 keV
β⁻ decay energy with neutron7,302 ±400 keV
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94SeSelenium-94

Classificationz: 34; n: 60; m: 94
Half life150 ns
Natural abundancesynthetic nuclide
Spin/parity0+
Decay modesβ⁻ decay
Discovery1997
Mass excess-36,810 ±500 keV
Binding energy8,180 ±5 keV
Neutron separation energy4,015 ±640 keV
β⁻ decay energy10,840 ±539 keV
β⁻ decay energy with neutron8,016 ±660 keV
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95SeSelenium-95

Classificationz: 34; n: 61; m: 95
Half life392 ns
Natural abundancesynthetic nuclide
Decay modesβ⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission
Discovery2010
Mass excess-30,460 ±500 keV
Binding energy8,112 ±5 keV
Neutron separation energy1,728 ±707 keV
β⁻ decay energy13,390 ±583 keV
β⁻ decay energy with neutron9,118 ±539 keV
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