Xenon-145

Properties and data of the isotope ¹⁴⁵Xe.

Content

General data

Name of the isotope:Xenon-145; Xe-145Symbol:¹⁴⁵Xe or 14554XeMass number A:145 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:91Isotopic mass:144.944720(12) u (atomic weight of Xenon-145)Nuclide mass:144.9150986 u (calculated nuclear mass without electrons)Mass excess:-51.49299 MeVMass defect:1.266339084 u (per nucleus)Nuclear binding energy:1179.58725871 MeV (per nucleus)
8.13508454 MeV (average binding energy per nucleon)Separation energy:S_N = 2.692(12) MeV (first neutron)
S_P = 13.5(4) MeV (first proton)Half-life:188(4) msDecay constant λ:3.6869530880848 s^-1Specific activity α:1.541899363918 × 10⁺²² Bq g^-1
416729557815.78 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2003

Radioactive Decay

Half-life T_½ = 188(4) ms respectively 1.88 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁵Cs	95 %	8.561(14) MeV
β^-, n	¹⁴⁴Cs	5.0(6) %	3.707(23) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 145) with Xenon-145. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 91	Isobar A = 145
52	¹⁴³Te
53	¹⁴⁴I	¹⁴⁵I
54	¹⁴⁵Xe	¹⁴⁵Xe
55	¹⁴⁶Cs	¹⁴⁵Cs
56	¹⁴⁷Ba	¹⁴⁵Ba
57	¹⁴⁸La	¹⁴⁵La
58	¹⁴⁹Ce	¹⁴⁵Ce
59	¹⁵⁰Pr	¹⁴⁵Pr
60	¹⁵¹Nd	¹⁴⁵Nd
61	¹⁵²Pm	¹⁴⁵Pm
62	¹⁵³Sm	¹⁴⁵Sm
63	¹⁵⁴Eu	¹⁴⁵Eu
64	¹⁵⁵Gd	¹⁴⁵Gd
65	¹⁵⁶Tb	¹⁴⁵Tb
66	¹⁵⁷Dy	¹⁴⁵Dy
67	¹⁵⁸Ho	¹⁴⁵Ho
68	¹⁵⁹Er	¹⁴⁵Er
69	¹⁶⁰Tm	¹⁴⁵Tm
70	¹⁶¹Yb
71	¹⁶²Lu
72	¹⁶³Hf
73	¹⁶⁴Ta
74	¹⁶⁵W
75	¹⁶⁶Re
76	¹⁶⁷Os
77	¹⁶⁸Ir
78	¹⁶⁹Pt
79	¹⁷⁰Au
80	¹⁷¹Hg