Hafnium-179

Properties and data of the isotope ¹⁷⁹Hf.

Contents

General data

Name of the isotope:Hafnium-179; Hf-179Symbol:¹⁷⁹Hf or 17972HfMass number A:179 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:107Isotopic mass:178.94582(2) u (atomic weight of Hafnium-179)Nuclide mass:178.906326 u (calculated nuclear mass without electrons)Mass excess:-50.46834 MeVMass defect:1.544728316 u (per nucleus)Nuclear binding energy:1438.90515798 MeV (per nucleus)
8.0385763 MeV (average binding energy per nucleon)Separation energy:S_N = 6.09899(8) MeV (first neutron)
S_P = 7.4141(20) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μ_N) = - 0.60409(13)Charge radius:5.3408(31) femtometer fmYear of discovery:1934

Parent Nuclides

Direct parent isotopes are: ¹⁷⁹Ta, ¹⁷⁹Lu.

Occurrence

Comparison of the natural Hafnium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Hafnium Isotopic mixture	178.486 u	100 %
Isotope ¹⁷⁴Hf	173.94005(2) u	0.16(12) %	2.0(4) × 10¹⁵ a	0+
Isotope ¹⁷⁶Hf	175.94141(2) u	5.26(70) %	stable	0+
Isotope ¹⁷⁷Hf	176.94323(2) u	18.60(16) %	stable	7/2-
Isotope ¹⁷⁸Hf	177.94371(2) u	27.28(28) %	stable	0+
Isotope ¹⁷⁹Hf	178.94582(2) u	13.62(11) %	stable	9/2+
Isotope ¹⁸⁰Hf	179.94656(2) u	35.08(33) %	stable	0+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹⁷⁹Hf

Isotope:¹⁷⁹Hf-NMRQuantity:13.62(11) %Spin:9/2+Nuclearmagnetic moment
μ/μ_N:- 0.60409(13)Gyromagnetic ratio γ:0.6821 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = -0.13424222222222Quadrupole moment Q:+ 3.793(33) barn (100 fm²)Resonance frequency:v₀ = 1.0856 at 1 TRelative Sensitivity:0.00055 (H₀ = const.)
0.8414 (v₀ = const.)
[related to ¹H = 1.000]

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
^179m1Hf	375.0352(25) keV	18.67(4) s	1/2-
^179m2Hf	1105.74(16) kev	25.05(25) d	25/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 179) with Hafnium-179. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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