Erbium-163

Properties and data of the isotope ¹⁶³Er.

Content

General data

Name of the isotope:Erbium-163; Er-163Symbol:¹⁶³Er or 16368ErMass number A:163 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:95Isotopic mass:162.930040(5) u (atomic weight of Erbium-163)Nuclide mass:162.8927399 u (calculated nuclear mass without electrons)Mass excess:-65.16732 MeVMass defect:1.425229196 u (per nucleus)Nuclear binding energy:1327.5924447 MeV (per nucleus)
8.14473892 MeV (average binding energy per nucleon)Separation energy:S_N = 6.905(5) MeV (first neutron)
S_P = 6.415(6) MeV (first proton)Half-life:75.0(4) minDecay constant λ:0.0001540327067911 s^-1Specific activity α:5.725967020576 × 10⁺¹⁷ Bq g^-1
15475586.542098 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = + 0.557(4)Quadrupole moment Q:+ 2.55(3) barn (100 fm²)Nuclear g-factor:g_l = 0.2228Year of discovery:1953

Radioactive Decay

Half-life T_½ = 75.0(4) min (minutes) respectively 4.500 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁶³Ho	100 %	1.211(5) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶³Tm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 163) with Erbium-163. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 95	Isobar A = 163
55	¹⁵⁰Cs
56	¹⁵¹Ba
57	¹⁵²La
58	¹⁵³Ce
59	¹⁵⁴Pr
60	¹⁵⁵Nd	¹⁶³Nd
61	¹⁵⁶Pm	¹⁶³Pm
62	¹⁵⁷Sm	¹⁶³Sm
63	¹⁵⁸Eu	¹⁶³Eu
64	¹⁵⁹Gd	¹⁶³Gd
65	¹⁶⁰Tb	¹⁶³Tb
66	¹⁶¹Dy	¹⁶³Dy
67	¹⁶²Ho	¹⁶³Ho
68	¹⁶³Er	¹⁶³Er
69	¹⁶⁴Tm	¹⁶³Tm
70	¹⁶⁵Yb	¹⁶³Yb
71	¹⁶⁶Lu	¹⁶³Lu
72	¹⁶⁷Hf	¹⁶³Hf
73	¹⁶⁸Ta	¹⁶³Ta
74	¹⁶⁹W	¹⁶³W
75	¹⁷⁰Re	¹⁶³Re
76	¹⁷¹Os	¹⁶³Os
77	¹⁷²Ir
78	¹⁷³Pt
79	¹⁷⁴Au
80	¹⁷⁵Hg
81	¹⁷⁶Tl