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Tungsten-158m

Properties and data of the isotope 158W.


Content

See also: list of Tungsten isotopes.

 

General data

Name of the isotope:Tungsten-158m; W-158mSymbol:158W or 15874WMass number A:158 (= number of nucleons)Atomic number Z:74 (= number of protons)Neutrons N:84Isotopic mass:157.97463(32) u (atomic weight of Tungsten-158m)
Excitation energy: 1888(8) keV
Nuclide mass:157.9340391 u (calculated nuclear mass without electrons)Mass excess:-23.632 MeVMass defect:1.332275312 u (per nucleus)Nuclear binding energy:1241.00645948 MeV (per nucleus)
7.85447126 MeV (average binding energy per nucleon)
Half-life:0.143(19) msDecay constant λ:4847.1830808388 s-1Specific activity α:1.859262374949 × 10+25 Bq g-1
5.025033445810 × 10+14 Ci g-1
Spin and parity:
(nuclear angular momentum)
(8+)

 

Radioactive Decay

Half-life T½ = 0.143(19) ms respectively 1.43 × 10-4 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α154Hfca. 100 %
Iso158W?
2p

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
158W1.25(21) ms0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 84) and isobaric (same nucleon number A = 158) with Tungsten-158m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 84Isobar A = 158
47131Ag
48132Cd
49133In
50134Sn
51135Sb
52136Te
53137I
54138Xe
55139Cs
56140Ba
57141La
58142Ce
59143Pr158Pr
60144Nd158Nd
61145Pm158Pm
62146Sm158Sm
63147Eu158Eu
64148Gd158Gd
65149Tb158Tb
66150Dy158Dy
67151Ho158Ho
68152Er158Er
69153Tm158Tm
70154Yb158Yb
71155Lu158Lu
72156Hf158Hf
73157Ta158Ta
74158W158W
75159Re

 


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Last update: 2020-10-21


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