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Lanthanum-127m

Properties and data of the isotope 127mLa.


Contents

See also: list of Lanthanum isotopes.

 

General data

Name of the isotope:Lanthanum-127m; La-127mSymbol:127mLa or 127m57LaMass number A:127 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:70Isotopic mass:126.916375(28) u (atomic weight of Lanthanum-127m)
Excitation energy: 14.2(4) keV
Nuclide mass:126.8851081 u (calculated nuclear mass without electrons)Mass excess:-77.89619 MeVMass defect:1.136195944 u (per nucleus)Nuclear binding energy:1058.35970466 MeV (per nucleus)
8.33354098 MeV (average binding energy per nucleon)
Half-life:3.7(4) minDecay constant λ:0.0031222845971169 s-1Specific activity α:1.492288702273 × 10+19 Bq g-1
403321270.88478 Ci g-1
Spin and parity:
(nuclear angular momentum)
(3/2+)

 

Radioactive Decay

Half-life T½ = 3.7(4) min (minutes) respectively 2.22 × 102 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+127Ba100 %

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
127La5.1(1) min(11/2-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 70) and isobaric (same nucleon number A = 127) with Lanthanum-127m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 70Isobar A = 127
39109Y
40110Zr
41111Nb
42112Mo
43113Tc
44114Ru
45115Rh127Rh
46116Pd127Pd
47117Ag127Ag
48118Cd127Cd
49119In127In
50120Sn127Sn
51121Sb127Sb
52122Te127Te
53123I127I
54124Xe127Xe
55125Cs127Cs
56126Ba127Ba
57127La127La
58128Ce127Ce
59129Pr127Pr
60130Nd127Nd
61131Pm127Pm
62132Sm
63133Eu
64134Gd
65135Tb

 

External data and identifiers

Adopted Levels, Gammas:NuDat 127La

 


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Last update: 2020-10-19


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