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Lutetium-149

Properties and data of the isotope 149Lu.


Content

Lutetium-149 is a radioisotope of the chemical element lutetium, which, in addition to the element-specific 71 protons, has 78 neutrons in the atomic nucleus, resulting in the mass number 149. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with 149Lu is for academic purposes only.

The first report on the production and characterization of the nuclide 149Lu dates from 2022; the synthesis succeeded through the reaction

96Ru(58Ni, p4n) 149Lu.

The nucleus of the isotope is one of the less common proton emitters: With a half-life of just 450 nanoseconds, the atomic nucleus decays radioactively, emitting a proton, a positively charged nuclear building block.

The Finnish discoverers of the isotope list the flattened spherical shape of the Lu-149 atomic nucleus as a further special feature: the deviation from the expected perfect spherical shape of the atomic nucleus is the strongest ever measured for this nuclide; one could also describe this distortion as pumpkin-like [1].

See also: list of Lutetium isotopes.

 

General data

Name of the isotope:Lutetium-149; Lu-149Symbol:149Lu or 14971LuMass number A:149 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:78Isotopic mass:149 u (atomic weight of Lutetium-149)Nuclide mass:148.9610545 u (calculated nuclear mass without electrons)Mass excess:0 MeVMass defect:1.23144072 u (per nucleus)Nuclear binding energy:1147.07964204 MeV (per nucleus)
7.69852109 MeV (average binding energy per nucleon)
Half-life:450 nsSpin and parity:
(nuclear angular momentum)
Year of discovery:2021

 

Radioactive Decay

Half-life T½ = 450 ns.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
p148Yb

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 149) with Lutetium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 78Isobar A = 149
43121Tc
44122Ru
45123Rh
46124Pd
47125Ag
48126Cd
49127In
50128Sn
51129Sb
52130Te
53131I
54132Xe
55133Cs149Cs
56134Ba149Ba
57135La149La
58136Ce149Ce
59137Pr149Pr
60138Nd149Nd
61139Pm149Pm
62140Sm149Sm
63141Eu149Eu
64142Gd149Gd
65143Tb149Tb
66144Dy149Dy
67145Ho149Ho
68146Er149Er
69147Tm149Tm
70148Yb149Yb
71149Lu149Lu

 

Literature and References

[1] - K. Auranen et al.:
Nanosecond-Scale Proton Emission from Strongly Oblate-Deformed 149Lu..
In: Physical Review Letters, (2022), DOI 10.1103/PhysRevLett.128.112501.

 


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Last update: 2022-12-21


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