Uranium-219

Properties and data of the isotope ²¹⁹U.

Contents

See also: List of individual Uranium isotopes (and general data sources).

General data

Name of the isotope:Uranium-219; U-219Symbol:²¹⁹U or 21992UMass number A:219 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:127Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3804347826087 (= neutron-proton ratio)Neutron excess (N-Z):35Isotopic mass:219.02500(5) u (atomic weight of Uranium-219)Nuclide mass:218.9745373 u (calculated nuclear mass without electrons)Mass excess:23.28735 MeVMass defect:1.795347276 u (per nucleus)Nuclear binding energy:1672.35521551 MeV (per nucleus)
7.63632518 MeV (average binding energy per nucleon)Separation energy:S_N = 6.68(5) MeV (first neutron)
S_P = 2.69(5) MeV (first proton)Half-life:ca. 42 μ sDecay constant λ:16503.504299046 s^-1Specific activity α:4.538193039791 × 10⁺²⁵ Bq g^-1
1.226538659403 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1993

Radioactive Decay

Half-life T_½ = ca. 42 μ s respectively 4.2 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹⁵Th	100 %	9.94(5) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 127) and isobaric (same nucleon number A = 219) with Uranium-219. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 127	Isobar A = 219
76	²⁰³Os
77	²⁰⁴Ir
78	²⁰⁵Pt
79	²⁰⁶Au
80	²⁰⁷Hg
81	²⁰⁸Tl
82	²⁰⁹Pb	²¹⁹Pb
83	²¹⁰Bi	²¹⁹Bi
84	²¹¹Po	²¹⁹Po
85	²¹²At	²¹⁹At
86	²¹³Rn	²¹⁹Rn
87	²¹⁴Fr	²¹⁹Fr
88	²¹⁵Ra	²¹⁹Ra
89	²¹⁶Ac	²¹⁹Ac
90	²¹⁷Th	²¹⁹Th
91	²¹⁸Pa	²¹⁹Pa
92	²¹⁹U	²¹⁹U
93	²²⁰Np	²¹⁹Np