Isotopes of ununoctium

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Ununoctium (Uuo) is an synthetic element created in particle colliders, and thus a standard atomic mass cannot be given. Like all synthetic elements, it has no stable isotopes. The first (and so far only) isotope to be synthesized was 294Uuo in 2006; it has a half-life of 890 microseconds.

Table

nuclide
symbol		 Z(p) N(n)  
isotopic mass (u)
 		 half-life decay mode(s) daughter
isotope(s)		 nuclear
spin
294Uuo 118 176 294.21392(71)# 890 µs α 290Lv

Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values from Ame2003 denote one standard deviation. Values from IUPAC are expanded uncertainties.

Theoretical

Lua error in package.lua at line 80: module 'strict' not found. Theoretical calculations done on the synthetic pathways for, and the half-life of, other isotopes have shown that some could be slightly more stable than the synthesized isotope 294Uuo, most likely 293Uuo, 295Uuo, 296Uuo, 297Uuo, 298Uuo, 300Uuo and 302Uuo.[1][2][3] Of these, 297Uuo, might provide the best chances for obtaining longer-lived nuclei,[1][3] and thus might become the focus of future work with this element. Some isotopes with many more neutrons, such as some located around 313Uuo, could also provide longer-lived nuclei.[4]

Target-projectile combinations leading to Z=118 compound nuclei

The below table contains various combinations of targets and projectiles that could be used to form compound nuclei with Z=118.

Target Projectile CN Attempt result
160Gd 136Xe 296Uuo* Reaction yet to be attempted
208Pb 86Kr 294Uuo* Failure to date
232Th 64Ni 296Uuo* Reaction yet to be attempted
238U 58Fe 296Uuo* Reaction yet to be attempted
244Pu 54Cr 298Uuo* Reaction yet to be attempted
248Cm 50Ti 298Uuo* Reaction yet to be attempted
250Cm 50Ti 300Uuo* Reaction yet to be attempted
249Cf 48Ca 297Uuo* Successful reaction
252Cf 48Ca 300Uuo* Reaction yet to be attempted
257Fm 40Ar 297Uuo* Reaction yet to be attempted

Theoretical calculations on evaporation cross sections

The below table contains various targets-projectile combinations for which calculations have provided estimates for cross section yields from various neutron evaporation channels. The channel with the highest expected yield is given.

DNS = Di-nuclear system ; σ = cross section

Target Projectile CN Channel (product) σ max Model Ref
208Pb 86Kr 294Uuo 1n (293Uuo) 0.1 pb DNS [5]
208Pb 85Kr 293Uuo 1n (292Uuo) 0.18 pb DNS [5]
252Cf 48Ca 300Uuo 3n (297Uuo) 1.2 pb DNS [6]
251Cf 48Ca 299Uuo 3n (296Uuo) 1.2 pb DNS [6]
249Cf 48Ca 297Uuo 3n (294Uuo) 0.3 pb DNS [6]

References

  • Isotope masses from:
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  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 6.2 Lua error in package.lua at line 80: module 'strict' not found.
Isotopes of ununseptium Isotopes of ununoctium Isotopes of ununennium
Table of nuclides
Isotopes of the chemical elements
1
H		 2
He
3
Li		 4
Be		 5
B		 6
C		 7
N		 8
O		 9
F		 10
Ne
11
Na		 12
Mg		 13
Al		 14
Si		 15
P		 16
S		 17
Cl		 18
Ar
19
K		 20
Ca		 21
Sc		 22
Ti		 23
V		 24
Cr		 25
Mn		 26
Fe		 27
Co		 28
Ni		 29
Cu		 30
Zn		 31
Ga		 32
Ge		 33
As		 34
Se		 35
Br		 36
Kr
37
Rb		 38
Sr		 39
Y		 40
Zr		 41
Nb		 42
Mo		 43
Tc		 44
Ru		 45
Rh		 46
Pd		 47
Ag		 48
Cd		 49
In		 50
Sn		 51
Sb		 52
Te		 53
I		 54
Xe
55
Cs		 56
Ba		 1 asterisk 72
Hf		 73
Ta		 74
W		 75
Re		 76
Os		 77
Ir		 78
Pt		 79
Au		 80
Hg		 81
Tl		 82
Pb		 83
Bi		 84
Po		 85
At		 86
Rn
87
Fr		 88
Ra		 2 asterisks 104
Rf		 105
Db		 106
Sg		 107
Bh		 108
Hs		 109
Mt		 110
Ds		 111
Rg		 112
Cn		 113
Uut		 114
Fl		 115
Uup		 116
Lv		 117
Uus		 118
Uuo
1 asterisk 57
La		 58
Ce		 59
Pr		 60
Nd		 61
Pm		 62
Sm		 63
Eu		 64
Gd		 65
Tb		 66
Dy		 67
Ho		 68
Er		 69
Tm		 70
Yb		 71
Lu
2 asterisks 89
Ac		 90
Th		 91
Pa		 92
U		 93
Np		 94
Pu		 95
Am		 96
Cm		 97
Bk		 98
Cf		 99
Es		 100
Fm		 101
Md		 102
No		 103
Lr
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