Hafnium-180m

Properties and data of the isotope ^180mHf.

Contents

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

General data

Name of the isotope:Hafnium-180m; Hf-180mSymbol:^180mHf or 180m72HfMass number A:180 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:108Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5 (= neutron-proton ratio)Neutron excess (N-Z):36Excitation energy:1141.50(5)Isotopic mass:179.94656(2) u (atomic weight of Hafnium-180m)Nuclide mass:179.907066 u (calculated nuclear mass without electrons)Mass excess:-49.77904 MeVMass defect:1.552653232 u (per nucleus)Nuclear binding energy:1446.28716969 MeV (per nucleus)
8.03492872 MeV (average binding energy per nucleon)Half-life:5.53(2) hDecay constant λ:3.481751961824 × 10^-5 s^-1Specific activity α:1.17137434376 × 10⁺¹⁷ Bq g^-1
3165876.6047811 Ci g^-1Spin and parity:
(nuclear angular momentum)8-Magnetic dipole moment:μ(μ_N) = + 8.7(10)Quadrupole moment Q:+ 0.046(3) barn (100 fm²)Nuclear g-factor:g_l = 1.0875

Radioactive Decay

Half-life T_½ = 5.53(2) h (hours) respectively 1.9908 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁸⁰Hf	99.7(1) %
β^-	¹⁸⁰Ta	0.3(1) %

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
¹⁸⁰Hf		stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 180) with Hafnium-180m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 108	Isobar A = 180
66	¹⁷⁴Dy
67	¹⁷⁵Ho
68	¹⁷⁶Er
69	¹⁷⁷Tm
70	¹⁷⁸Yb	¹⁸⁰Yb
71	¹⁷⁹Lu	¹⁸⁰Lu
72	¹⁸⁰Hf	¹⁸⁰Hf
73	¹⁸¹Ta	¹⁸⁰Ta
74	¹⁸²W	¹⁸⁰W
75	¹⁸³Re	¹⁸⁰Re
76	¹⁸⁴Os	¹⁸⁰Os
77	¹⁸⁵Ir	¹⁸⁰Ir
78	¹⁸⁶Pt	¹⁸⁰Pt
79	¹⁸⁷Au	¹⁸⁰Au
80	¹⁸⁸Hg	¹⁸⁰Hg
81	¹⁸⁹Tl	¹⁸⁰Tl
82	¹⁹⁰Pb	¹⁸⁰Pb
83	¹⁹¹Bi
84	¹⁹²Po
85	¹⁹³At
86	¹⁹⁴Rn