Ytterbium-169

Properties and data of the isotope ¹⁶⁹Yb.

Content

General data

Name of the isotope:Ytterbium-169; Yb-169Symbol:¹⁶⁹Yb or 16970YbMass number A:169 (= number of nucleons)Atomic number Z:70 (= number of protons)Neutrons N:99Isotopic mass:168.9351820(13) u (atomic weight of Ytterbium-169)Nuclide mass:168.8967849 u (calculated nuclear mass without electrons)Mass excess:-60.37758 MeVMass defect:1.470396924 u (per nucleus)Nuclear binding energy:1369.66591232 MeV (per nucleus)
8.10453203 MeV (average binding energy per nucleon)Separation energy:S_N = 6.86698(15) MeV (first neutron)
S_P = 6.3536(19) MeV (first proton)Half-life:32.018(5) dDecay constant λ:2.505633335010 × 10^-7 s^-1Specific activity α:8.981712432610 × 10⁺¹⁴ Bq g^-1
24274.898466515 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μ_N) = - 0.635(8)Quadrupole moment Q:+ 3.54(6) barn (100 fm²)Nuclear g-factor:g_l = -0.18142857142857Charge radius:5.2771(56) femtometer fmYear of discovery:1946

Radioactive Decay

Half-life T_½ = 32.018(5) d respectively 2.7663552 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE	¹⁶⁹Tm	100 %	0.8976(15) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶⁹Lu.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^169mYb	24.1999(16) keV	46(2) s	1/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 169) with Ytterbium-169. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 99	Isobar A = 169
57	¹⁵⁶La
58	¹⁵⁷Ce
59	¹⁵⁸Pr
60	¹⁵⁹Nd
61	¹⁶⁰Pm
62	¹⁶¹Sm
63	¹⁶²Eu
64	¹⁶³Gd	¹⁶⁹Gd
65	¹⁶⁴Tb	¹⁶⁹Tb
66	¹⁶⁵Dy	¹⁶⁹Dy
67	¹⁶⁶Ho	¹⁶⁹Ho
68	¹⁶⁷Er	¹⁶⁹Er
69	¹⁶⁸Tm	¹⁶⁹Tm
70	¹⁶⁹Yb	¹⁶⁹Yb
71	¹⁷⁰Lu	¹⁶⁹Lu
72	¹⁷¹Hf	¹⁶⁹Hf
73	¹⁷²Ta	¹⁶⁹Ta
74	¹⁷³W	¹⁶⁹W
75	¹⁷⁴Re	¹⁶⁹Re
76	¹⁷⁵Os	¹⁶⁹Os
77	¹⁷⁶Ir	¹⁶⁹Ir
78	¹⁷⁷Pt	¹⁶⁹Pt
79	¹⁷⁸Au
80	¹⁷⁹Hg
81	¹⁸⁰Tl
82	¹⁸¹Pb