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Promethium-149

Properties and data of the isotope 149Pm.


Contents

See also: list of Promethium isotopes.

 

General data

Name of the isotope:Promethium-149; Pm-149Symbol:149Pm or 14961PmMass number A:149 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:88Isotopic mass:148.9183417(24) u (atomic weight of Promethium-149)Nuclide mass:148.8848809 u (calculated nuclear mass without electrons)Mass excess:-76.06422 MeVMass defect:1.32149786 u (per nucleus)Nuclear binding energy:1230.9673276 MeV (per nucleus)
8.26152569 MeV (average binding energy per nucleon)
Separation energy:SN = 7.270(6) MeV (first neutron)
SP = 5.9452(24) MeV (first proton)
Half-life:53.08(5) hDecay constant λ:3.627371580423 × 10-6 s-1Specific activity α:1.47598260869 × 10+16 Bq g-1
398914.21856541 Ci g-1
Spin and parity:
(nuclear angular momentum)
7/2+Magnetic dipole moment:μ(μN) = 3.3(5)Nuclear g-factor:gl = 0.94285714285714Year of discovery:1947

 

Radioactive Decay

Half-life T½ = 53.08(5) h (hours) respectively 1.91088 × 105 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
β-149Sm100 %1.0715(19) MeV

 

Parent Nuclides

Direct parent isotope is: 149Nd.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 149) with Promethium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 88Isobar A = 149
49137In
50138Sn
51139Sb
52140Te
53141I
54142Xe
55143Cs149Cs
56144Ba149Ba
57145La149La
58146Ce149Ce
59147Pr149Pr
60148Nd149Nd
61149Pm149Pm
62150Sm149Sm
63151Eu149Eu
64152Gd149Gd
65153Tb149Tb
66154Dy149Dy
67155Ho149Ho
68156Er149Er
69157Tm149Tm
70158Yb149Yb
71159Lu149Lu
72160Hf
73161Ta
74162W
75163Re
76164Os
77165Ir
78166Pt

 

External data and identifiers

Adopted Levels, Gammas:NuDat 149Pm

 


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Last update: 2020-10-20


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