Xenon-124

Properties and data of the isotope ¹²⁴Xe.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

General data

Name of the isotope:Xenon-124; Xe-124Symbol:¹²⁴Xe or 12454XeMass number A:124 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:70Isotopic mass:123.90589(2) u (atomic weight of Xenon-124)Nuclide mass:123.8762686 u (calculated nuclear mass without electrons)Mass excess:-87.6629 MeVMass defect:1.123205848 u (per nucleus)Nuclear binding energy:1046.25950818 MeV (per nucleus)
8.43757668 MeV (average binding energy per nucleon)Separation energy:S_N = 10.484(10) MeV (first neutron)
S_P = 7.007(4) MeV (first proton)Half-life:> 1.8 × 10²² aDecay constant λ:1.221086272760 × 10^-30 s^-1Specific activity α:5.978498810324 × 10^-9 Bq g^-1
1.615810489276 × 10^-19 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.7661(55) femtometer fmYear of discovery:1922

Radioactive Decay

Half-life T_½ = > 1.8 × 10²² a respectively 5.67648 × 10²⁹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2 β	¹²⁴Te	?
2νEC/EC	¹²⁴Te	?

Parent Nuclides

Direct parent isotope is: ¹²⁴Cs.

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+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 70) and isobaric (same nucleon number A = 124) with Xenon-124. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 70	Isobar A = 124
39	¹⁰⁹Y
40	¹¹⁰Zr
41	¹¹¹Nb
42	¹¹²Mo
43	¹¹³Tc
44	¹¹⁴Ru	¹²⁴Ru
45	¹¹⁵Rh	¹²⁴Rh
46	¹¹⁶Pd	¹²⁴Pd
47	¹¹⁷Ag	¹²⁴Ag
48	¹¹⁸Cd	¹²⁴Cd
49	¹¹⁹In	¹²⁴In
50	¹²⁰Sn	¹²⁴Sn
51	¹²¹Sb	¹²⁴Sb
52	¹²²Te	¹²⁴Te
53	¹²³I	¹²⁴I
54	¹²⁴Xe	¹²⁴Xe
55	¹²⁵Cs	¹²⁴Cs
56	¹²⁶Ba	¹²⁴Ba
57	¹²⁷La	¹²⁴La
58	¹²⁸Ce	¹²⁴Ce
59	¹²⁹Pr	¹²⁴Pr
60	¹³⁰Nd	¹²⁴Nd
61	¹³¹Pm
62	¹³²Sm
63	¹³³Eu
64	¹³⁴Gd
65	¹³⁵Tb