Xenon-111

Properties and data of the isotope ¹¹¹Xe.

Content

General data

Name of the isotope:Xenon-111; Xe-111Symbol:¹¹¹Xe or 11154XeMass number A:111 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:57Isotopic mass:110.94160(9) u (atomic weight of Xenon-111)Nuclide mass:110.9119786 u (calculated nuclear mass without electrons)Mass excess:-54.39925 MeVMass defect:0.97485194000001 u (per nucleus)Nuclear binding energy:908.068733 MeV (per nucleus)
8.1807994 MeV (average binding energy per nucleon)Separation energy:S_N = 10.54(13) MeV (first neutron)
S_P = 1.22(10) MeV (first proton)Half-life:0.74(20) sDecay constant λ:0.93668537913506 s^-1Specific activity α:5.128046631449 × 10⁺²¹ Bq g^-1
138595854904.04 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1979

Radioactive Decay

Half-life T_½ = 0.74(20) s respectively 7.4 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁰⁷Te	ca. 8 %	3.72(5) MeV
EE/β⁺	¹¹¹I	?	10.56(9) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 57) and isobaric (same nucleon number A = 111) with Xenon-111. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 57	Isobar A = 111
32	⁸⁹Ge
33	⁹⁰As
34	⁹¹Se
35	⁹²Br
36	⁹³Kr
37	⁹⁴Rb
38	⁹⁵Sr
39	⁹⁶Y
40	⁹⁷Zr	¹¹¹Zr
41	⁹⁸Nb	¹¹¹Nb
42	⁹⁹Mo	¹¹¹Mo
43	¹⁰⁰Tc	¹¹¹Tc
44	¹⁰¹Ru	¹¹¹Ru
45	¹⁰²Rh	¹¹¹Rh
46	¹⁰³Pd	¹¹¹Pd
47	¹⁰⁴Ag	¹¹¹Ag
48	¹⁰⁵Cd	¹¹¹Cd
49	¹⁰⁶In	¹¹¹In
50	¹⁰⁷Sn	¹¹¹Sn
51	¹⁰⁸Sb	¹¹¹Sb
52	¹⁰⁹Te	¹¹¹Te
53	¹¹⁰I	¹¹¹I
54	¹¹¹Xe	¹¹¹Xe
55	¹¹²Cs