Tantalum-180

Properties and data of the isotope ¹⁸⁰Ta.

Contents

General data

Name of the isotope:Tantalum-180; Ta-180Symbol:¹⁸⁰Ta or 18073TaMass number A:180 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:107Isotopic mass:179.9474684(21) u (atomic weight of Tantalum-180)Nuclide mass:179.907426 u (calculated nuclear mass without electrons)Mass excess:-48.93287 MeVMass defect:1.550904948 u (per nucleus)Nuclear binding energy:1444.65865363 MeV (per nucleus)
8.02588141 MeV (average binding energy per nucleon)Separation energy:S_N = 6.6469(23) MeV (first neutron)
S_P = 5.7589(23) MeV (first proton)Half-life:8.154(6) hDecay constant λ:2.361305904940 × 10^-5 s^-1Specific activity α:7.944199314499 × 10⁺¹⁶ Bq g^-1
2147080.8958106 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Year of discovery:1938

Radioactive Decay

Half-life T_½ = 8.154(6) h (hours) respectively 2.93544 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	¹⁸⁰Hf	85(3) %	0.8465(24) MeV
β^-	¹⁸⁰W	15(3) %	0.7032(23) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸⁰Hf.

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
^180mTa	76.79(55) keV	7.1 × 10¹⁵ a	9-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 180) with Tantalum-180. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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