Uranium-243

Properties and data of the isotope ²⁴²U.

Content

Uranium-243 is a radioisotope of the chemical element uranium, which, in addition to the element-specific 92 protons, has 151 neutrons in the atomic nucleus, resulting in the mass number 243. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with ²⁴³U is for academic purposes only.

General data

Name of the isotope:Uranium-243; U-243Symbol:²⁴²U or 24292UMass number A:242 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:151Isotopic mass:243.06708(32) u (atomic weight of Uranium-243)Nuclide mass:243.0166173 u (calculated nuclear mass without electrons)Mass excess:993.97862 MeVMass defect:1.96122526 u (per nucleus)Nuclear binding energy:1826.86956234 MeV (per nucleus)
7.54904778 MeV (average binding energy per nucleon)Separation energy:S_N = 4.211 MeV (first neutron)Half-life:Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁴³Np	?	2.67 MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 151) and isobaric (same nucleon number A = 242) with Uranium-243. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 151	Isobar A = 242
92	²⁴²U	²⁴²U
93	²⁴⁴Np	²⁴²Np
94	²⁴⁵Pu	²⁴²Pu
95	²⁴⁶Am	²⁴²Am
96	²⁴⁷Cm	²⁴²Cm
97	²⁴⁸Bk	²⁴²Bk
98	²⁴⁹Cf	²⁴²Cf
99	²⁵⁰Es	²⁴²Es
100	²⁵¹Fm	²⁴²Fm
101	²⁵²Md
102	²⁵³No
103	²⁵⁴Lr
104	²⁵⁵Rf
105	²⁵⁶Db