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 .
See also: list of Lutetium isotopes.
Half-life T½ = 450 ns.
|Decay mode||Daughter||Probability||Decay energy||γ energy|
|OZ||Isotone N = 78||Isobar A = 149|
 - K. Auranen et al.:
Nanosecond-Scale Proton Emission from Strongly Oblate-Deformed 149Lu..
In: Physical Review Letters, (2022), DOI 10.1103/PhysRevLett.128.112501.
Last update: 2022-12-21
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