Ytterbium-181

Properties and data of the isotope ¹⁸¹Yb.

Content

General data

Name of the isotope:Ytterbium-181; Yb-181Symbol:¹⁸¹Yb or 18170YbMass number A:181 (= number of nucleons)Atomic number Z:70 (= number of protons)Neutrons N:111Isotopic mass:180.95589(32) u (atomic weight of Ytterbium-181)Nuclide mass:180.9174929 u (calculated nuclear mass without electrons)Mass excess:-41.0882 MeVMass defect:1.553667916 u (per nucleus)Nuclear binding energy:1447.23234175 MeV (per nucleus)
7.99575879 MeV (average binding energy per nucleon)Separation energy:S_N = 4.56(42) MeV (first neutron)
S_P = 10.46(58) MeV (first proton)Half-life:160 nsDecay constant λ:4332169.8784997 s^-1Specific activity α:1.449385402083 × 10⁺²⁸ Bq g^-1
3.917257843468 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2000

Radioactive Decay

Half-life T_½ = 160 ns respectively 1.60 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁸¹Lu	?	3.71(32) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 181) with Ytterbium-181. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 111	Isobar A = 181
70	¹⁸¹Yb	¹⁸¹Yb
71	¹⁸²Lu	¹⁸¹Lu
72	¹⁸³Hf	¹⁸¹Hf
73	¹⁸⁴Ta	¹⁸¹Ta
74	¹⁸⁵W	¹⁸¹W
75	¹⁸⁶Re	¹⁸¹Re
76	¹⁸⁷Os	¹⁸¹Os
77	¹⁸⁸Ir	¹⁸¹Ir
78	¹⁸⁹Pt	¹⁸¹Pt
79	¹⁹⁰Au	¹⁸¹Au
80	¹⁹¹Hg	¹⁸¹Hg
81	¹⁹²Tl	¹⁸¹Tl
82	¹⁹³Pb	¹⁸¹Pb
83	¹⁹⁴Bi
84	¹⁹⁵Po
85	¹⁹⁶At
86	¹⁹⁷Rn