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Lawrencium-251

Properties and data of the isotope 251Lr.


Content

Lawrencium-251 is a radioisotope of the element lawrencium, whose atomic nucleus has 148 neutrons in addition to the element-specific 103 protons, resulting in a mass number of 251 Lr.

The generation and detection of the unstable and short-lived isotope was first reported in 2022. It was produced using the Argonne Gas-Filled Analyzer (AGFA) in a 203Tl(50Ti, 2n) fusion evaporation reaction [1].

See also: list of Lawrencium isotopes.

 

General data

Name of the isotope:Lawrencium-251; Lr-251Symbol:251Lr or 251103LrMass number A:251 (= number of nucleons)Atomic number Z:103 (= number of protons)Neutrons N:148Isotopic mass:251 u (atomic weight of Lawrencium-251)
Excitation energy: ß
Nuclide mass:250.943505 u (calculated nuclear mass without electrons)Mass excess:0 MeVMass defect:2.088385864 u (per nucleus)Nuclear binding energy:1945.318902 MeV (per nucleus)
7.75027451 MeV (average binding energy per nucleon)
Half-life:Spin and parity:
(nuclear angular momentum)
Year of discovery:2022

 

Radioactive Decay

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α247Md
ε ?

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 148) and isobaric (same nucleon number A = 251) with Lawrencium-251. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 148Isobar A = 251
90238Th
91239Pa
92240U
93241Np
94242Pu
95243Am
96244Cm251Cm
97245Bk251Bk
98246Cf251Cf
99247Es251Es
100248Fm251Fm
101249Md251Md
102250No251No
103251Lr251Lr

 

External data and identifiers

Adopted Levels, Gammas:NuDat 251Lr

 

Literature and References

[1] - T. Huang et al.:
Discovery of the new isotope 251Lr: Impact of the hexacontetrapole deformation on single-proton orbital energies near the Z = 100 deformed shell gap.
In: Physical Review C, (2022), DOI 10.1103/PhysRevC.106.L061301.

 


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Last update: 2022-12-09


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