Xenon-142

Properties and data of the isotope ¹⁴²Xe.

Content

General data

Name of the isotope:Xenon-142; Xe-142Symbol:¹⁴²Xe or 14254XeMass number A:142 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:88Isotopic mass:141.9299731(29) u (atomic weight of Xenon-142)Nuclide mass:141.9003517 u (calculated nuclear mass without electrons)Mass excess:-65.22964 MeVMass defect:1.255091236 u (per nucleus)Nuclear binding energy:1169.10995579 MeV (per nucleus)
8.2331687 MeV (average binding energy per nucleon)Separation energy:S_N = 5.104(4) MeV (first neutron)
S_P = 12.592(16) MeV (first proton)Half-life:1.23(2) sDecay constant λ:0.56353429313817 s^-1Specific activity α:2.406867299775 × 10⁺²¹ Bq g^-1
65050467561.489 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.8841(168) femtometer fmYear of discovery:1960

Radioactive Decay

Half-life T_½ = 1.23(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴²Cs	99.8 %	5.285(8) MeV
β^-, n	¹⁴¹Cs	0.21(6) %	1.177(10) MeV

Parent Nuclides

Direct parent isotope is: ²⁴⁸Cm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 142) with Xenon-142. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 88	Isobar A = 142
49	¹³⁷In
50	¹³⁸Sn
51	¹³⁹Sb
52	¹⁴⁰Te	¹⁴²Te
53	¹⁴¹I	¹⁴²I
54	¹⁴²Xe	¹⁴²Xe
55	¹⁴³Cs	¹⁴²Cs
56	¹⁴⁴Ba	¹⁴²Ba
57	¹⁴⁵La	¹⁴²La
58	¹⁴⁶Ce	¹⁴²Ce
59	¹⁴⁷Pr	¹⁴²Pr
60	¹⁴⁸Nd	¹⁴²Nd
61	¹⁴⁹Pm	¹⁴²Pm
62	¹⁵⁰Sm	¹⁴²Sm
63	¹⁵¹Eu	¹⁴²Eu
64	¹⁵²Gd	¹⁴²Gd
65	¹⁵³Tb	¹⁴²Tb
66	¹⁵⁴Dy	¹⁴²Dy
67	¹⁵⁵Ho	¹⁴²Ho
68	¹⁵⁶Er
69	¹⁵⁷Tm
70	¹⁵⁸Yb
71	¹⁵⁹Lu
72	¹⁶⁰Hf
73	¹⁶¹Ta
74	¹⁶²W
75	¹⁶³Re
76	¹⁶⁴Os
77	¹⁶⁵Ir
78	¹⁶⁶Pt