Samarium-163

Properties and data of the isotope ¹⁶³Sm.

Content

General data

Name of the isotope:Samarium-163; Sm-163Symbol:¹⁶³Sm or 16362SmMass number A:163 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:101Isotopic mass:162.94555(32) u (atomic weight of Samarium-163)Nuclide mass:162.9115407 u (calculated nuclear mass without electrons)Mass excess:-50.71985 MeVMass defect:1.4147585 u (per nucleus)Nuclear binding energy:1317.8390542 MeV (per nucleus)
8.08490217 MeV (average binding energy per nucleon)Separation energy:S_N = 4.26(36) MeV (first neutron)
S_P = 11.64(42) MeV (first proton)Half-life:1.23 sDecay constant λ:0.56353429313817 s^-1Specific activity α:2.094865983137 × 10⁺²¹ Bq g^-1
56617999544.259 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2-)Year of discovery:2012

Radioactive Decay

Half-life T_½ = 1.23 s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶³Eu	100 %	5.76(30) MeV
β^-, n	¹⁶²Eu	?

Parent Nuclides

Direct parent isotope is: ¹⁶³Pm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 101) and isobaric (same nucleon number A = 163) with Samarium-163. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 101	Isobar A = 163
59	¹⁶⁰Pr
60	¹⁶¹Nd	¹⁶³Nd
61	¹⁶²Pm	¹⁶³Pm
62	¹⁶³Sm	¹⁶³Sm
63	¹⁶⁴Eu	¹⁶³Eu
64	¹⁶⁵Gd	¹⁶³Gd
65	¹⁶⁶Tb	¹⁶³Tb
66	¹⁶⁷Dy	¹⁶³Dy
67	¹⁶⁸Ho	¹⁶³Ho
68	¹⁶⁹Er	¹⁶³Er
69	¹⁷⁰Tm	¹⁶³Tm
70	¹⁷¹Yb	¹⁶³Yb
71	¹⁷²Lu	¹⁶³Lu
72	¹⁷³Hf	¹⁶³Hf
73	¹⁷⁴Ta	¹⁶³Ta
74	¹⁷⁵W	¹⁶³W
75	¹⁷⁶Re	¹⁶³Re
76	¹⁷⁷Os	¹⁶³Os
77	¹⁷⁸Ir
78	¹⁷⁹Pt
79	¹⁸⁰Au
80	¹⁸¹Hg
81	¹⁸²Tl
82	¹⁸³Pb
83	¹⁸⁴Bi