Samarium-134

Properties and data of the isotope ¹³⁴Sm.

Content

General data

Name of the isotope:Samarium-134; Sm-134Symbol:¹³⁴Sm or 13462SmMass number A:134 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:72Isotopic mass:133.93411(21) u (atomic weight of Samarium-134)Nuclide mass:133.9001007 u (calculated nuclear mass without electrons)Mass excess:-61.37614 MeVMass defect:1.174915936 u (per nucleus)Nuclear binding energy:1094.42714489 MeV (per nucleus)
8.16736675 MeV (average binding energy per nucleon)Separation energy:S_N = 12.22(36) MeV (first neutron)
S_P = 3.26(20) MeV (first proton)Half-life:9.5(8) sDecay constant λ:0.072962861111573 s^-1Specific activity α:3.303703963593 × 10⁺²⁰ Bq g^-1
8928929631.333 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1977

Radioactive Decay

Half-life T_½ = 9.5(8) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹³⁴Pm	100 %	5.36(20) MeV

Parent Nuclides

Direct parent isotope is: ¹³⁴Eu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 72) and isobaric (same nucleon number A = 134) with Samarium-134. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 72	Isobar A = 134
40	¹¹²Zr
41	¹¹³Nb
42	¹¹⁴Mo
43	¹¹⁵Tc
44	¹¹⁶Ru
45	¹¹⁷Rh
46	¹¹⁸Pd
47	¹¹⁹Ag
48	¹²⁰Cd	¹³⁴Cd
49	¹²¹In	¹³⁴In
50	¹²²Sn	¹³⁴Sn
51	¹²³Sb	¹³⁴Sb
52	¹²⁴Te	¹³⁴Te
53	¹²⁵I	¹³⁴I
54	¹²⁶Xe	¹³⁴Xe
55	¹²⁷Cs	¹³⁴Cs
56	¹²⁸Ba	¹³⁴Ba
57	¹²⁹La	¹³⁴La
58	¹³⁰Ce	¹³⁴Ce
59	¹³¹Pr	¹³⁴Pr
60	¹³²Nd	¹³⁴Nd
61	¹³³Pm	¹³⁴Pm
62	¹³⁴Sm	¹³⁴Sm
63	¹³⁵Eu	¹³⁴Eu
64	¹³⁶Gd	¹³⁴Gd
65	¹³⁷Tb
66	¹³⁸Dy