Thulium-179

Properties and data of the isotope ¹⁷⁹Tm.

Contents

General data

Name of the isotope:Thulium-179; Tm-179Symbol:¹⁷⁹Tm or 17969TmMass number A:179 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:110Isotopic mass:178.95534(54) u (atomic weight of Thulium-179)Nuclide mass:178.9174914 u (calculated nuclear mass without electrons)Mass excess:-41.60052 MeVMass defect:1.537727968 u (per nucleus)Nuclear binding energy:1432.38437582 MeV (per nucleus)
8.00214735 MeV (average binding energy per nucleon)Separation energy:S_N = 5.56(64) MeV (first neutron)
S_P = 8.63(78) MeV (first proton)Half-life:160 nsDecay constant λ:4332169.8784997 s^-1Specific activity α:1.465670631320 × 10⁺²⁸ Bq g^-1
3.961271976541 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2012

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^-	¹⁷⁹Yb	?	4.94(54) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 179) with Thulium-179. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 110	Isobar A = 179
69	¹⁷⁹Tm	¹⁷⁹Tm
70	¹⁸⁰Yb	¹⁷⁹Yb
71	¹⁸¹Lu	¹⁷⁹Lu
72	¹⁸²Hf	¹⁷⁹Hf
73	¹⁸³Ta	¹⁷⁹Ta
74	¹⁸⁴W	¹⁷⁹W
75	¹⁸⁵Re	¹⁷⁹Re
76	¹⁸⁶Os	¹⁷⁹Os
77	¹⁸⁷Ir	¹⁷⁹Ir
78	¹⁸⁸Pt	¹⁷⁹Pt
79	¹⁸⁹Au	¹⁷⁹Au
80	¹⁹⁰Hg	¹⁷⁹Hg
81	¹⁹¹Tl	¹⁷⁹Tl
82	¹⁹²Pb	¹⁷⁹Pb
83	¹⁹³Bi
84	¹⁹⁴Po
85	¹⁹⁵At
86	¹⁹⁶Rn