Xenon-117

Properties and data of the isotope ¹¹⁷Xe.

Content

General data

Name of the isotope:Xenon-117; Xe-117Symbol:¹¹⁷Xe or 11754XeMass number A:117 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:63Isotopic mass:116.920359(11) u (atomic weight of Xenon-117)Nuclide mass:116.8907376 u (calculated nuclear mass without electrons)Mass excess:-74.18511 MeVMass defect:1.048082436 u (per nucleus)Nuclear binding energy:976.28250064 MeV (per nucleus)
8.34429488 MeV (average binding energy per nucleon)Separation energy:S_N = 9.21(17) MeV (first neutron)
S_P = 3.98(10) MeV (first proton)Half-life:61(2) sDecay constant λ:0.01136306853377 s^-1Specific activity α:5.899137871678 × 10⁺¹⁹ Bq g^-1
1594361586.9402 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2(+)Magnetic dipole moment:μ(μ_N) = - 0.5938(15)Nuclear g-factor:g_l = -0.23752Year of discovery:1969

Radioactive Decay

Half-life T_½ = 61(2) s respectively 6.1 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹¹⁷I	99.98 %	6.251(28) MeV
β⁺, p	¹¹⁶Te	0.0029 %

Parent Nuclides

Direct parent isotope is: ¹¹⁷Cs.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 63) and isobaric (same nucleon number A = 117) with Xenon-117. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 63	Isobar A = 117
35	⁹⁸Br
36	⁹⁹Kr
37	¹⁰⁰Rb
38	¹⁰¹Sr
39	¹⁰²Y
40	¹⁰³Zr
41	¹⁰⁴Nb
42	¹⁰⁵Mo	¹¹⁷Mo
43	¹⁰⁶Tc	¹¹⁷Tc
44	¹⁰⁷Ru	¹¹⁷Ru
45	¹⁰⁸Rh	¹¹⁷Rh
46	¹⁰⁹Pd	¹¹⁷Pd
47	¹¹⁰Ag	¹¹⁷Ag
48	¹¹¹Cd	¹¹⁷Cd
49	¹¹²In	¹¹⁷In
50	¹¹³Sn	¹¹⁷Sn
51	¹¹⁴Sb	¹¹⁷Sb
52	¹¹⁵Te	¹¹⁷Te
53	¹¹⁶I	¹¹⁷I
54	¹¹⁷Xe	¹¹⁷Xe
55	¹¹⁸Cs	¹¹⁷Cs
56	¹¹⁹Ba	¹¹⁷Ba
57	¹²⁰La	¹¹⁷La
58	¹²¹Ce
59	¹²²Pr