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Promethium-145

Properties and data of the isotope 145Pm.


Content

See also: list of Promethium isotopes.

 

General data

Name of the isotope:Promethium-145; Pm-145Symbol:145Pm or 14561PmMass number A:145 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:84Isotopic mass:144.912756(3) u (atomic weight of Promethium-145)Nuclide mass:144.8792952 u (calculated nuclear mass without electrons)Mass excess:-81.26726 MeVMass defect:1.292423896 u (per nucleus)Nuclear binding energy:1203.88510458 MeV (per nucleus)
8.30265589 MeV (average binding energy per nucleon)
Separation energy:SN = 7.9227(15) MeV (first neutron)
SP = 4.8085(25) MeV (first proton)
Half-life:17.7(4) aDecay constant λ:1.241776421218 × 10-9 s-1Specific activity α:5193161475781.8 Bq g-1
140.35571556167 Ci g-1
Spin and parity:
(nuclear angular momentum)
5/2+Magnetic dipole moment:μ(μN) = 3.8Nuclear g-factor:gl = 1.52Year of discovery:1951

 

Radioactive Decay

Half-life T½ = 17.7(4) a respectively 5.5819 × 108 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE145Nd> 99 %0.164(3) MeV
α141Pr<< 1 %2.3232(29) MeV

 

Parent Nuclides

Direct parent isotope is: 145Sm.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 84) and isobaric (same nucleon number A = 145) with Promethium-145. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 84Isobar A = 145
47131Ag
48132Cd
49133In
50134Sn
51135Sb
52136Te
53137I145I
54138Xe145Xe
55139Cs145Cs
56140Ba145Ba
57141La145La
58142Ce145Ce
59143Pr145Pr
60144Nd145Nd
61145Pm145Pm
62146Sm145Sm
63147Eu145Eu
64148Gd145Gd
65149Tb145Tb
66150Dy145Dy
67151Ho145Ho
68152Er145Er
69153Tm145Tm
70154Yb
71155Lu
72156Hf
73157Ta
74158W
75159Re

 

External data and identifiers

Adopted Levels, Gammas:NuDat 145Pm

 


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Last update: 2023-01-09


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