Hafnium-182

Properties and data of the isotope ¹⁸²Hf.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Hafnium-182; Hf-182Symbol:¹⁸²Hf or 18272HfMass number A:182 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:110Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5277777777778 (= neutron-proton ratio)Neutron excess (N-Z):38Isotopic mass:181.950564(7) u (atomic weight of Hafnium-182)Nuclide mass:181.91107 u (calculated nuclear mass without electrons)Mass excess:-46.04934 MeVMass defect:1.565979064 u (per nucleus)Nuclear binding energy:1458.70010224 MeV (per nucleus)
8.01483573 MeV (average binding energy per nucleon)Separation energy:S_N = 6.718(6) MeV (first neutron)
S_P = 8.54(13) MeV (first proton)Half-life:8.90(9) × 10⁶ aDecay constant λ:2.469612686481 × 10^-15 s^-1Specific activity α:8216770.9765087 Bq g^-1
0.00022207489125699 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.3516(36) femtometer fmYear of discovery:1961

Radioactive Decay

Half-life T_½ = 8.90(9) × 10⁶ a respectively 2.806704 × 10¹⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁸²Ta	100 %	0.380(6) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸²Lu.

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
^182mHf	1172.87(18) keV	61.5(15) min	(8-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 182) with Hafnium-182. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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