Xenon-112

Properties and data of the isotope ¹¹²Xe.

Content

General data

Name of the isotope:Xenon-112; Xe-112Symbol:¹¹²Xe or 11254XeMass number A:112 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:58Isotopic mass:111.935559(9) u (atomic weight of Xenon-112)Nuclide mass:111.9059376 u (calculated nuclear mass without electrons)Mass excess:-60.0264 MeVMass defect:0.989557856 u (per nucleus)Nuclear binding energy:921.76720552 MeV (per nucleus)
8.23006433 MeV (average binding energy per nucleon)Separation energy:S_N = 13.70(9) MeV (first neutron)
S_P = 2.362(10) MeV (first proton)Half-life:2.7(8) sDecay constant λ:0.25672117798516 s^-1Specific activity α:1.392802788788 × 10⁺²¹ Bq g^-1
37643318615.914 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1978

Radioactive Decay

Half-life T_½ = 2.7(8) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹¹²I	98.8(8) %	7.037(13) MeV
α	¹⁰⁸Te	1.2(8) %	3.33(6) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 58) and isobaric (same nucleon number A = 112) with Xenon-112. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 58	Isobar A = 112
32	⁹⁰Ge
33	⁹¹As
34	⁹²Se
35	⁹³Br
36	⁹⁴Kr
37	⁹⁵Rb
38	⁹⁶Sr
39	⁹⁷Y
40	⁹⁸Zr	¹¹²Zr
41	⁹⁹Nb	¹¹²Nb
42	¹⁰⁰Mo	¹¹²Mo
43	¹⁰¹Tc	¹¹²Tc
44	¹⁰²Ru	¹¹²Ru
45	¹⁰³Rh	¹¹²Rh
46	¹⁰⁴Pd	¹¹²Pd
47	¹⁰⁵Ag	¹¹²Ag
48	¹⁰⁶Cd	¹¹²Cd
49	¹⁰⁷In	¹¹²In
50	¹⁰⁸Sn	¹¹²Sn
51	¹⁰⁹Sb	¹¹²Sb
52	¹¹⁰Te	¹¹²Te
53	¹¹¹I	¹¹²I
54	¹¹²Xe	¹¹²Xe
55	¹¹³Cs	¹¹²Cs
56	¹¹⁴Ba