Samarium-162

Properties and data of the isotope ¹⁶²Sm.

Content

General data

Name of the isotope:Samarium-162; Sm-162Symbol:¹⁶²Sm or 16262SmMass number A:162 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:100Isotopic mass:161.94146(21) u (atomic weight of Samarium-162)Nuclide mass:161.9074507 u (calculated nuclear mass without electrons)Mass excess:-54.52966 MeVMass defect:1.410183584 u (per nucleus)Nuclear binding energy:1313.57754739 MeV (per nucleus)
8.10850338 MeV (average binding energy per nucleon)Separation energy:S_N = 5.93(20) MeV (first neutron)
S_P = 11.58(36) MeV (first proton)Half-life:2.4(5) sDecay constant λ:0.28881132523331 s^-1Specific activity α:1.080287256211 × 10⁺²¹ Bq g^-1
29196952870.573 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2005

Radioactive Decay

Half-life T_½ = 2.4(5) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶²Eu	100 %	4.17(20) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶²Pm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 100) and isobaric (same nucleon number A = 162) with Samarium-162. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 100	Isobar A = 162
59	¹⁵⁹Pr
60	¹⁶⁰Nd	¹⁶²Nd
61	¹⁶¹Pm	¹⁶²Pm
62	¹⁶²Sm	¹⁶²Sm
63	¹⁶³Eu	¹⁶²Eu
64	¹⁶⁴Gd	¹⁶²Gd
65	¹⁶⁵Tb	¹⁶²Tb
66	¹⁶⁶Dy	¹⁶²Dy
67	¹⁶⁷Ho	¹⁶²Ho
68	¹⁶⁸Er	¹⁶²Er
69	¹⁶⁹Tm	¹⁶²Tm
70	¹⁷⁰Yb	¹⁶²Yb
71	¹⁷¹Lu	¹⁶²Lu
72	¹⁷²Hf	¹⁶²Hf
73	¹⁷³Ta	¹⁶²Ta
74	¹⁷⁴W	¹⁶²W
75	¹⁷⁵Re	¹⁶²Re
76	¹⁷⁶Os	¹⁶²Os
77	¹⁷⁷Ir
78	¹⁷⁸Pt
79	¹⁷⁹Au
80	¹⁸⁰Hg
81	¹⁸¹Tl
82	¹⁸²Pb