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Promethium-159

Properties and data of the isotope 159Pm.


Content

See also: list of Promethium isotopes.

 

General data

Name of the isotope:Promethium-159; Pm-159Symbol:159Pm or 15961PmMass number A:159 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:98Isotopic mass:158.939286(11) u (atomic weight of Promethium-159)Nuclide mass:158.9058252 u (calculated nuclear mass without electrons)Mass excess:-56.55473 MeVMass defect:1.38720272 u (per nucleus)Nuclear binding energy:1292.17101046 MeV (per nucleus)
8.1268617 MeV (average binding energy per nucleon)
Separation energy:SN = 5.536(17) MeV (first neutron)
SP = 9.79(20) MeV (first proton)
Half-life:1.5(2) sDecay constant λ:0.4620981203733 s-1Specific activity α:1.761278463291 × 10+21 Bq g-1
47602120629.489 Ci g-1
Spin and parity:
(nuclear angular momentum)
(5/2-)Year of discovery:1998

 

Radioactive Decay

Half-life T½ = 1.5(2) s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-159Sm100 %5.653(12) MeV

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 159) with Promethium-159. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 98Isobar A = 159
57155La
58156Ce
59157Pr159Pr
60158Nd159Nd
61159Pm159Pm
62160Sm159Sm
63161Eu159Eu
64162Gd159Gd
65163Tb159Tb
66164Dy159Dy
67165Ho159Ho
68166Er159Er
69167Tm159Tm
70168Yb159Yb
71169Lu159Lu
72170Hf159Hf
73171Ta159Ta
74172W159W
75173Re159Re
76174Os
77175Ir
78176Pt
79177Au
80178Hg
81179Tl
82180Pb

 

External data and identifiers

Adopted Levels, Gammas:NuDat 159Pm

 


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Last update: 2020-10-20


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