Terbium-165

Properties and data of the isotope ¹⁶⁵Tb.

Contents

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

General data

Name of the isotope:Terbium-165; Tb-165Symbol:¹⁶⁵Tb or 16565TbMass number A:165 (= number of nucleons)Atomic number Z:65 (= number of protons)Neutrons N:100Isotopic mass:164.93498(11) u (atomic weight of Terbium-165)Nuclide mass:164.8993253 u (calculated nuclear mass without electrons)Mass excess:-60.56574 MeVMass defect:1.44013868 u (per nucleus)Nuclear binding energy:1341.48053959 MeV (per nucleus)
8.13018509 MeV (average binding energy per nucleon)Separation energy:S_N = 6.56(14) MeV (first neutron)
S_P = 8.08(14) MeV (first proton)Half-life:2.11(10) minDecay constant λ:0.0054750962129538 s^-1Specific activity α:2.01047564732 × 10⁺¹⁹ Bq g^-1
543371796.57405 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2+)Year of discovery:1983

Radioactive Decay

Half-life T_½ = 2.11(10) min (minutes) respectively 1.266 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶⁵Dy	100 %	3.05(10) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 100) and isobaric (same nucleon number A = 165) with Terbium-165. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 100	Isobar A = 165
58	¹⁵⁸Ce
59	¹⁵⁹Pr
60	¹⁶⁰Nd
61	¹⁶¹Pm
62	¹⁶²Sm	¹⁶⁵Sm
63	¹⁶³Eu	¹⁶⁵Eu
64	¹⁶⁴Gd	¹⁶⁵Gd
65	¹⁶⁵Tb	¹⁶⁵Tb
66	¹⁶⁶Dy	¹⁶⁵Dy
67	¹⁶⁷Ho	¹⁶⁵Ho
68	¹⁶⁸Er	¹⁶⁵Er
69	¹⁶⁹Tm	¹⁶⁵Tm
70	¹⁷⁰Yb	¹⁶⁵Yb
71	¹⁷¹Lu	¹⁶⁵Lu
72	¹⁷²Hf	¹⁶⁵Hf
73	¹⁷³Ta	¹⁶⁵Ta
74	¹⁷⁴W	¹⁶⁵W
75	¹⁷⁵Re	¹⁶⁵Re
76	¹⁷⁶Os	¹⁶⁵Os
77	¹⁷⁷Ir	¹⁶⁵Ir
78	¹⁷⁸Pt
79	¹⁷⁹Au
80	¹⁸⁰Hg
81	¹⁸¹Tl
82	¹⁸²Pb