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Promethium-142

Properties and data of the isotope 142Pm.


Content

See also: list of Promethium isotopes.

 

General data

Name of the isotope:Promethium-142; Pm-142Symbol:142Pm or 14261PmMass number A:142 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:81Isotopic mass:141.912890(25) u (atomic weight of Promethium-142)Nuclide mass:141.8794292 u (calculated nuclear mass without electrons)Mass excess:-81.14244 MeVMass defect:1.266295148 u (per nucleus)Nuclear binding energy:1179.54633259 MeV (per nucleus)
8.30666431 MeV (average binding energy per nucleon)
Separation energy:SN = 8.690(27) MeV (first neutron)
SP = 4.238(24) MeV (first proton)
Half-life:40.5(5) sDecay constant λ:0.017114745199011 s-1Specific activity α:7.309745132650 × 10+19 Bq g-1
1975606792.6082 Ci g-1
Spin and parity:
(nuclear angular momentum)
1+Year of discovery:1959

 

Radioactive Decay

Half-life T½ = 40.5(5) s respectively 4.05 × 101 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+142Nd100 %4.808(24) MeV

 

Parent Nuclides

Direct parent isotope is: 142Sm.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
142mPm883.17 (16) keV2.0(2) ms(8)-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 81) and isobaric (same nucleon number A = 142) with Promethium-142. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 81Isobar A = 142
45126Rh
46127Pd
47128Ag
48129Cd
49130In
50131Sn
51132Sb
52133Te142Te
53134I142I
54135Xe142Xe
55136Cs142Cs
56137Ba142Ba
57138La142La
58139Ce142Ce
59140Pr142Pr
60141Nd142Nd
61142Pm142Pm
62143Sm142Sm
63144Eu142Eu
64145Gd142Gd
65146Tb142Tb
66147Dy142Dy
67148Ho142Ho
68149Er
69150Tm
70151Yb
71152Lu
72153Hf

 

External data and identifiers

Adopted Levels, Gammas:NuDat 142Pm

 


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Last update: 2020-10-20


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