Samarium-164

Properties and data of the isotope ¹⁶⁴Sm.

Content

General data

Name of the isotope:Samarium-164; Sm-164Symbol:¹⁶⁴Sm or 16462SmMass number A:164 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:102Isotopic mass:163.94836(32) u (atomic weight of Samarium-164)Nuclide mass:163.9143507 u (calculated nuclear mass without electrons)Mass excess:-48.10235 MeVMass defect:1.420613416 u (per nucleus)Nuclear binding energy:1323.29287332 MeV (per nucleus)
8.06885898 MeV (average binding energy per nucleon)Separation energy:S_N = 5.45(42) MeV (first neutron)
S_P = 12.14(50) MeV (first proton)Half-life:1.43(24) sDecay constant λ:0.48471830808388 s^-1Specific activity α:1.790823269123 × 10⁺²¹ Bq g^-1
48400628895.23 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2012

Radioactive Decay

Half-life T_½ = 1.43(24) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶⁴Eu	100 %	5.28(32) MeV
β^-, n	¹⁶³Eu	?	0.31(30) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 102) and isobaric (same nucleon number A = 164) with Samarium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 102	Isobar A = 164
60	¹⁶²Nd
61	¹⁶³Pm
62	¹⁶⁴Sm	¹⁶⁴Sm
63	¹⁶⁵Eu	¹⁶⁴Eu
64	¹⁶⁶Gd	¹⁶⁴Gd
65	¹⁶⁷Tb	¹⁶⁴Tb
66	¹⁶⁸Dy	¹⁶⁴Dy
67	¹⁶⁹Ho	¹⁶⁴Ho
68	¹⁷⁰Er	¹⁶⁴Er
69	¹⁷¹Tm	¹⁶⁴Tm
70	¹⁷²Yb	¹⁶⁴Yb
71	¹⁷³Lu	¹⁶⁴Lu
72	¹⁷⁴Hf	¹⁶⁴Hf
73	¹⁷⁵Ta	¹⁶⁴Ta
74	¹⁷⁶W	¹⁶⁴W
75	¹⁷⁷Re	¹⁶⁴Re
76	¹⁷⁸Os	¹⁶⁴Os
77	¹⁷⁹Ir	¹⁶⁴Ir
78	¹⁸⁰Pt
79	¹⁸¹Au
80	¹⁸²Hg
81	¹⁸³Tl
82	¹⁸⁴Pb
83	¹⁸⁵Bi
84	¹⁸⁶Po