Xenon-137

Properties and data of the isotope ¹³⁷Xe.

Content

General data

Name of the isotope:Xenon-137; Xe-137Symbol:¹³⁷Xe or 13754XeMass number A:137 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:83Isotopic mass:136.91155777(11) u (atomic weight of Xenon-137)Nuclide mass:136.8819364 u (calculated nuclear mass without electrons)Mass excess:-82.38341 MeVMass defect:1.230181986 u (per nucleus)Nuclear binding energy:1145.90713887 MeV (per nucleus)
8.36428569 MeV (average binding energy per nucleon)Separation energy:S_N = 4.02556(10) MeV (first neutron)
S_P = 10.127(14) MeV (first proton)Half-life:3.818(13) minDecay constant λ:0.0030257865398985 s^-1Specific activity α:1.339831820247 × 10⁺¹⁹ Bq g^-1
362116708.17505 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μ_N) = - 0.9704(10)Quadrupole moment Q:0.490(17) barn (100 fm²)Nuclear g-factor:g_l = -0.27725714285714Charge radius:4.8094(49) femtometer fmYear of discovery:1943

Radioactive Decay

Half-life T_½ = 3.818(13) min (minutes) respectively 2.2908 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹³⁷Cs	100 %	4.41624(3) MeV

Parent Nuclides

Direct parent isotopes are: ¹³⁷I, ¹³⁸I, ²⁴⁸Cm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 137) with Xenon-137. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 83	Isobar A = 137
46	¹²⁹Pd
47	¹³⁰Ag
48	¹³¹Cd
49	¹³²In	¹³⁷In
50	¹³³Sn	¹³⁷Sn
51	¹³⁴Sb	¹³⁷Sb
52	¹³⁵Te	¹³⁷Te
53	¹³⁶I	¹³⁷I
54	¹³⁷Xe	¹³⁷Xe
55	¹³⁸Cs	¹³⁷Cs
56	¹³⁹Ba	¹³⁷Ba
57	¹⁴⁰La	¹³⁷La
58	¹⁴¹Ce	¹³⁷Ce
59	¹⁴²Pr	¹³⁷Pr
60	¹⁴³Nd	¹³⁷Nd
61	¹⁴⁴Pm	¹³⁷Pm
62	¹⁴⁵Sm	¹³⁷Sm
63	¹⁴⁶Eu	¹³⁷Eu
64	¹⁴⁷Gd	¹³⁷Gd
65	¹⁴⁸Tb	¹³⁷Tb
66	¹⁴⁹Dy
67	¹⁵⁰Ho
68	¹⁵¹Er
69	¹⁵²Tm
70	¹⁵³Yb
71	¹⁵⁴Lu
72	¹⁵⁵Hf
73	¹⁵⁶Ta
74	¹⁵⁷W