Gadolinium-134

Properties and data of the isotope ¹³⁴Gd.

Contents

Gadolinium-134 is a radioisotope of the chemical element gadolinium, which has 70 neutrons in its atomic nucleus in addition to the element-specific 64 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 134. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ¹³⁴Gd is exclusively for academic purposes.

The proton-rich isotope was discovered and identified - according to a report from 2026 - during the irradiation of a 1 mm thick Be target with uranium-238 particles (345 MeV/nucleon) [1].

See also: List of individual Gadolinium isotopes (and general data sources).

General data

Name of the isotope:Gadolinium-134; Gd-134Symbol:¹³⁴Gd or 13464GdMass number A:134 (= number of nucleons)Atomic number Z:64 (= number of protons)Neutrons N:70Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.09375 (= neutron-proton ratio)Neutron excess (N-Z):6Isotopic mass:133.95542(43) u (atomic weight of Gadolinium-134)Nuclide mass:133.9203137 u (calculated nuclear mass without electrons)Mass excess:-41.526 MeVMass defect:1.151926168 u (per nucleus)Nuclear binding energy:1073.01231393 MeV (per nucleus)
8.00755458 MeV (average binding energy per nucleon)Separation energy:S_N = 13.541(640) MeV (first neutron)
S_P = 1.583(499) MeV (first proton)Half-life:> 310 nsDecay constant λ:2235958.6469676 s^-1Specific activity α:1.00520439602 × 10⁺²⁸ Bq g^-1
2.716768637913 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2026

Radioactive Decay

Half-life T_½ = > 310 ns respectively 3.1 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC, β⁺ ?	¹³⁴Eu		8.27(50) MeV
β⁺, p ?	¹³³Sm

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 70) and isobaric (same nucleon number A = 134) with Gadolinium-134. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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