Europium-134

Properties and data of the isotope ¹³⁴Eu.

Contents

General data

Name of the isotope:Europium-134; Eu-134Symbol:¹³⁴Eu or 13463EuMass number A:134 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:71Isotopic mass:133.94640(32) u (atomic weight of Europium-134)Nuclide mass:133.9118422 u (calculated nuclear mass without electrons)Mass excess:-49.92808 MeVMass defect:1.161786052 u (per nucleus)Nuclear binding energy:1082.19673672 MeV (per nucleus)
8.07609505 MeV (average binding energy per nucleon)Separation energy:S_N = 10.76(42) MeV (first neutron)Half-life:0.5(2) sDecay constant λ:1.3862943611199 s^-1Specific activity α:6.277037530827 × 10⁺²¹ Bq g^-1
169649662995.33 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1989

Radioactive Decay

Half-life T_½ = 0.5(2) s respectively 5 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹³⁴Sm	100 %	11.45(36) MeV
EE, p	¹³³Pm	> 0 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 134) with Europium-134. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 71	Isobar A = 134
40	¹¹¹Zr
41	¹¹²Nb
42	¹¹³Mo
43	¹¹⁴Tc
44	¹¹⁵Ru
45	¹¹⁶Rh
46	¹¹⁷Pd
47	¹¹⁸Ag
48	¹¹⁹Cd	¹³⁴Cd
49	¹²⁰In	¹³⁴In
50	¹²¹Sn	¹³⁴Sn
51	¹²²Sb	¹³⁴Sb
52	¹²³Te	¹³⁴Te
53	¹²⁴I	¹³⁴I
54	¹²⁵Xe	¹³⁴Xe
55	¹²⁶Cs	¹³⁴Cs
56	¹²⁷Ba	¹³⁴Ba
57	¹²⁸La	¹³⁴La
58	¹²⁹Ce	¹³⁴Ce
59	¹³⁰Pr	¹³⁴Pr
60	¹³¹Nd	¹³⁴Nd
61	¹³²Pm	¹³⁴Pm
62	¹³³Sm	¹³⁴Sm
63	¹³⁴Eu	¹³⁴Eu
64	¹³⁵Gd	¹³⁴Gd
65	¹³⁶Tb