Tantalum-184

Properties and data of the isotope ¹⁸⁴Ta.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Tantalum isotopes (and general data sources).

General data

Name of the isotope:Tantalum-184; Ta-184Symbol:¹⁸⁴Ta or 18473TaMass number A:184 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:111Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5205479452055 (= neutron-proton ratio)Neutron excess (N-Z):38Isotopic mass:183.954010(28) u (atomic weight of Tantalum-184)Nuclide mass:183.9139676 u (calculated nuclear mass without electrons)Mass excess:-42.83941 MeVMass defect:1.579023012 u (per nucleus)Nuclear binding energy:1470.85046154 MeV (per nucleus)
7.99375251 MeV (average binding energy per nucleon)Separation energy:S_N = 5.618(26) MeV (first neutron)
S_P = 6.85(4) MeV (first proton)Half-life:8.7(1) hDecay constant λ:2.213113603320 × 10^-5 s^-1Specific activity α:7.28288626133 × 10⁺¹⁶ Bq g^-1
1968347.6381978 Ci g^-1Spin and parity:
(nuclear angular momentum)(5-)Year of discovery:1955

Radioactive Decay

Half-life T_½ = 8.7(1) h (hours) respectively 3.1320 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁸⁴W	100 %	2.866(26) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸⁴Hf.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 184) with Tantalum-184. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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