Terbium-163

Properties and data of the isotope ¹⁶³Tb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Terbium isotopes (and general data sources).

General data

Name of the isotope:Terbium-163; Tb-163Symbol:¹⁶³Tb or 16365TbMass number A:163 (= number of nucleons)Atomic number Z:65 (= number of protons)Neutrons N:98Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5076923076923 (= neutron-proton ratio)Neutron excess (N-Z):33Isotopic mass:162.930653(4) u (atomic weight of Terbium-163)Nuclide mass:162.8949983 u (calculated nuclear mass without electrons)Mass excess:-64.59631 MeVMass defect:1.427135848 u (per nucleus)Nuclear binding energy:1329.3684796 MeV (per nucleus)
8.15563484 MeV (average binding energy per nucleon)Separation energy:S_N = 6.99(4) MeV (first neutron)
S_P = 7.605(6) MeV (first proton)Half-life:19.5(3) minDecay constant λ:0.00059243348765807 s^-1Specific activity α:2.202295007913 × 10⁺¹⁸ Bq g^-1
59521486.700376 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Year of discovery:1966

Radioactive Decay

Half-life T_½ = 19.5(3) min (minutes) respectively 1.170 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶³Dy	100 %	1.785(4) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶³Gd.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 163) with Terbium-163. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 98	Isobar A = 163
56	¹⁵⁴Ba
57	¹⁵⁵La
58	¹⁵⁶Ce
59	¹⁵⁷Pr
60	¹⁵⁸Nd	¹⁶³Nd
61	¹⁵⁹Pm	¹⁶³Pm
62	¹⁶⁰Sm	¹⁶³Sm
63	¹⁶¹Eu	¹⁶³Eu
64	¹⁶²Gd	¹⁶³Gd
65	¹⁶³Tb	¹⁶³Tb
66	¹⁶⁴Dy	¹⁶³Dy
67	¹⁶⁵Ho	¹⁶³Ho
68	¹⁶⁶Er	¹⁶³Er
69	¹⁶⁷Tm	¹⁶³Tm
70	¹⁶⁸Yb	¹⁶³Yb
71	¹⁶⁹Lu	¹⁶³Lu
72	¹⁷⁰Hf	¹⁶³Hf
73	¹⁷¹Ta	¹⁶³Ta
74	¹⁷²W	¹⁶³W
75	¹⁷³Re	¹⁶³Re
76	¹⁷⁴Os	¹⁶³Os
77	¹⁷⁵Ir
78	¹⁷⁶Pt
79	¹⁷⁷Au
80	¹⁷⁸Hg
81	¹⁷⁹Tl
82	¹⁸⁰Pb