Thulium-176

Properties and data of the isotope ¹⁷⁶Tm.

Contents

General data

Name of the isotope:Thulium-176; Tm-176Symbol:¹⁷⁶Tm or 17669TmMass number A:176 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:107Isotopic mass:175.94700(11) u (atomic weight of Thulium-176)Nuclide mass:175.9091514 u (calculated nuclear mass without electrons)Mass excess:-49.36918 MeVMass defect:1.52007322 u (per nucleus)Nuclear binding energy:1415.93908399 MeV (per nucleus)
8.04510843 MeV (average binding energy per nucleon)Separation energy:S_N = 5.13(11) MeV (first neutron)
S_P = 8.01(41) MeV (first proton)Half-life:1.9(1) minDecay constant λ:0.0060802384259644 s^-1Specific activity α:2.09234584360 × 10⁺¹⁹ Bq g^-1
565498876.65108 Ci g^-1Spin and parity:
(nuclear angular momentum)(4+)Year of discovery:1961

Radioactive Decay

Half-life T_½ = 1.9(1) min (minutes) respectively 1.14 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁷⁶Yb	100 %	4.12(10) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 176) with Thulium-176. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 107	Isobar A = 176
65	¹⁷²Tb
66	¹⁷³Dy
67	¹⁷⁴Ho
68	¹⁷⁵Er	¹⁷⁶Er
69	¹⁷⁶Tm	¹⁷⁶Tm
70	¹⁷⁷Yb	¹⁷⁶Yb
71	¹⁷⁸Lu	¹⁷⁶Lu
72	¹⁷⁹Hf	¹⁷⁶Hf
73	¹⁸⁰Ta	¹⁷⁶Ta
74	¹⁸¹W	¹⁷⁶W
75	¹⁸²Re	¹⁷⁶Re
76	¹⁸³Os	¹⁷⁶Os
77	¹⁸⁴Ir	¹⁷⁶Ir
78	¹⁸⁵Pt	¹⁷⁶Pt
79	¹⁸⁶Au	¹⁷⁶Au
80	¹⁸⁷Hg	¹⁷⁶Hg
81	¹⁸⁸Tl	¹⁷⁶Tl
82	¹⁸⁹Pb
83	¹⁹⁰Bi
84	¹⁹¹Po
85	¹⁹²At
86	¹⁹³Rn