Xenon-134m

Properties and data of the isotope ¹³⁴Xe.

Content

General data

Name of the isotope:Xenon-134m; Xe-134mSymbol:¹³⁴Xe or 13454XeMass number A:134 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:80Isotopic mass:133.905393033(10) u (atomic weight of Xenon-134m)
Excitation energy: 1965.5(5) keVNuclide mass:133.8757716 u (calculated nuclear mass without electrons)Mass excess:-88.12582 MeVMass defect:1.210351975 u (per nucleus)Nuclear binding energy:1127.4356026 MeV (per nucleus)
8.41369853 MeV (average binding energy per nucleon)Half-life:290(17) msDecay constant λ:2.390162691586 s^-1Specific activity α:1.082247850142 × 10⁺²² Bq g^-1
292499418957.46 Ci g^-1Spin and parity:
(nuclear angular momentum)7-

Radioactive Decay

Half-life T_½ = 290(17) ms respectively 2.9 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹³⁴Xe	100 %

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
¹³⁴Xe		5.8 × 10²² a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 134) with Xenon-134m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 80	Isobar A = 134
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd	¹³⁴Cd
49	¹²⁹In	¹³⁴In
50	¹³⁰Sn	¹³⁴Sn
51	¹³¹Sb	¹³⁴Sb
52	¹³²Te	¹³⁴Te
53	¹³³I	¹³⁴I
54	¹³⁴Xe	¹³⁴Xe
55	¹³⁵Cs	¹³⁴Cs
56	¹³⁶Ba	¹³⁴Ba
57	¹³⁷La	¹³⁴La
58	¹³⁸Ce	¹³⁴Ce
59	¹³⁹Pr	¹³⁴Pr
60	¹⁴⁰Nd	¹³⁴Nd
61	¹⁴¹Pm	¹³⁴Pm
62	¹⁴²Sm	¹³⁴Sm
63	¹⁴³Eu	¹³⁴Eu
64	¹⁴⁴Gd	¹³⁴Gd
65	¹⁴⁵Tb
66	¹⁴⁶Dy
67	¹⁴⁷Ho
68	¹⁴⁸Er
69	¹⁴⁹Tm
70	¹⁵⁰Yb
71	¹⁵¹Lu