About   |   More   |   Search
ChemLin Logo

Promethium-158

Properties and data of the isotope 158Pm.

Contents
General Data
Radioactive Decay
Isotones und Isobares

See also: List of individual Promethium isotopes (and general data sources).

 

General data

Name of the isotope:Promethium-158; Pm-158Symbol:158Pm or 15861PmMass number A:158 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5901639344262 (= neutron-proton ratio)Neutron excess (N-Z):36Isotopic mass:157.936565(14) u (atomic weight of Promethium-158)Nuclide mass:157.9031042 u (calculated nuclear mass without electrons)Mass excess:-59.08932 MeVMass defect:1.381258804 u (per nucleus)Nuclear binding energy:1286.63428837 MeV (per nucleus)
8.14325499 MeV (average binding energy per nucleon)Separation energy:SN = 4.863(15) MeV (first neutron)
SP = 9.917(28) MeV (first proton)Half-life:4.8(5) sDecay constant λ:0.14440566261666 s-1Specific activity α:5.539052492038 × 10+20 Bq g-1
14970412140.644 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:1987

 

Radioactive Decay

Half-life T½ = 4.8(5) s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
β-158Sm100 %6.161(14) MeV

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 158) with Promethium-158. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 97Isobar A = 158
56153Ba
57154La
58155Ce158Ce
59156Pr158Pr
60157Nd158Nd
61158Pm158Pm
62159Sm158Sm
63160Eu158Eu
64161Gd158Gd
65162Tb158Tb
66163Dy158Dy
67164Ho158Ho
68165Er158Er
69166Tm158Tm
70167Yb158Yb
71168Lu158Lu
72169Hf158Hf
73170Ta158Ta
74171W158W
75172Re
76173Os
77174Ir
78175Pt
79176Au
80177Hg
81178Tl
82179Pb

 

External data and identifiers

Adopted Levels, Gammas:NuDat 158Pm

 

More Chemistry

isotopes

Social Media

Facebook

LinkedIn

Twitter

About ChemLin

home

about

contact, imprint

cookie and privacy policy

terms of use

Last update: 2020-10-20

© 1996 - 2026 ChemLin