Xenon-131

Properties and data of the isotope ¹³¹Xe.

Content

General data

Name of the isotope:Xenon-131; Xe-131Symbol:¹³¹Xe or 13154XeMass number A:131 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:77Isotopic mass:130.905084(2) u (atomic weight of Xenon-131)Nuclide mass:130.8754626 u (calculated nuclear mass without electrons)Mass excess:-88.41368 MeVMass defect:1.18466626 u (per nucleus)Nuclear binding energy:1103.50951319 MeV (per nucleus)
8.42373674 MeV (average binding energy per nucleon)Separation energy:S_N = 6.60441(1) MeV (first neutron)
S_P = 8.766(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = +0.691845(7)Charge radius:4.7808(49) femtometer fmYear of discovery:1920

Parent Nuclides

Direct parent isotopes are: ¹³¹Cs, ¹³¹I.

Occurrence

Comparison of the natural Xenon isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Xenon Isotopic mixture	131.293 u	100 %
Isotope ¹²⁴Xe	123.90589(2) u	0.095(5) %	> 1.8 × 10²² a	0+
Isotope ¹²⁶Xe	125.90430(3) u	0.089(3) %	stable	0+
Isotope ¹²⁸Xe	127.903531(7) u	1.910(13) %	stable	0+
Isotope ¹²⁹Xe	128.90478086(4) u	26.401(138) %	stable	1/2+
Isotope ¹³⁰Xe	129.9035094(1) u	4.071(22) %	stable	0+
Isotope ¹³¹Xe	130.905084(2) u	21.232(51) %	stable	3/2+
Isotope ¹³²Xe	131.90415509(4) u	26.909(55) %	stable	0+
Isotope ¹³⁴Xe	133.905393033(10) u	10.436(35) %	5.8 × 10²² a	0+
Isotope ¹³⁶Xe	135.90721448(7) u	8.857(72) %	2.165(61) × 10²¹ a	0+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹³¹Xe

Isotope:¹³¹Xe-NMRQuantity:21.232(51) %Spin:3/2+Nuclearmagnetic moment
μ/μ_N:+0.691845(7)Gyromagnetic ratio γ:2.2091 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 0.46123Quadrupole moment Q:- 0.1146(11) barn (100 fm²)Resonance frequency:v₀ = 3.5159 at 1 TRelative Sensitivity:0.00282 (H₀ = const.)
0.4129 (v₀ = const.)
[related to ¹H = 1.000]

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^131mXe	163.930(8) keV	11.84(4) d	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 131) with Xenon-131. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 77	Isobar A = 131
43	¹²⁰Tc
44	¹²¹Ru
45	¹²²Rh
46	¹²³Pd
47	¹²⁴Ag	¹³¹Ag
48	¹²⁵Cd	¹³¹Cd
49	¹²⁶In	¹³¹In
50	¹²⁷Sn	¹³¹Sn
51	¹²⁸Sb	¹³¹Sb
52	¹²⁹Te	¹³¹Te
53	¹³⁰I	¹³¹I
54	¹³¹Xe	¹³¹Xe
55	¹³²Cs	¹³¹Cs
56	¹³³Ba	¹³¹Ba
57	¹³⁴La	¹³¹La
58	¹³⁵Ce	¹³¹Ce
59	¹³⁶Pr	¹³¹Pr
60	¹³⁷Nd	¹³¹Nd
61	¹³⁸Pm	¹³¹Pm
62	¹³⁹Sm	¹³¹Sm
63	¹⁴⁰Eu	¹³¹Eu
64	¹⁴¹Gd
65	¹⁴²Tb
66	¹⁴³Dy
67	¹⁴⁴Ho
68	¹⁴⁵Er
69	¹⁴⁶Tm