Uranium-215

Properties and data of the isotope ²¹⁵U.

Contents

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

General data

Name of the isotope:Uranium-215; U-215Symbol:²¹⁵U or 21592UMass number A:215 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:123Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3369565217391 (= neutron-proton ratio)Neutron excess (N-Z):31Isotopic mass:215.02676(9) u (atomic weight of Uranium-215)Nuclide mass:214.9762973 u (calculated nuclear mass without electrons)Mass excess:24.92678 MeVMass defect:1.758927612 u (per nucleus)Nuclear binding energy:1638.43051701 MeV (per nucleus)
7.62060706 MeV (average binding energy per nucleon)Separation energy:
S_P = 1.85(12) MeV (first proton)Half-life:0.7(+13-3) msDecay constant λ:990.21025794278 s^-1Specific activity α:2.773574722923 × 10⁺²⁴ Bq g^-1
74961478997935 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-

Radioactive Decay

Half-life T_½ = 0.7(+13-3) ms respectively 7 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹¹Th	> 0 %	8.59(5) MeV
EC/β⁺	²¹⁴Pa	?	7.06(11) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 123) and isobaric (same nucleon number A = 215) with Uranium-215. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 123	Isobar A = 215
74	¹⁹⁷W
75	¹⁹⁸Re
76	¹⁹⁹Os
77	²⁰⁰Ir
78	²⁰¹Pt
79	²⁰²Au
80	²⁰³Hg	²¹⁵Hg
81	²⁰⁴Tl	²¹⁵Tl
82	²⁰⁵Pb	²¹⁵Pb
83	²⁰⁶Bi	²¹⁵Bi
84	²⁰⁷Po	²¹⁵Po
85	²⁰⁸At	²¹⁵At
86	²⁰⁹Rn	²¹⁵Rn
87	²¹⁰Fr	²¹⁵Fr
88	²¹¹Ra	²¹⁵Ra
89	²¹²Ac	²¹⁵Ac
90	²¹³Th	²¹⁵Th
91	²¹⁴Pa	²¹⁵Pa
92	²¹⁵U	²¹⁵U