Hafnium-177

Properties and data of the isotope ¹⁷⁷Hf.

Contents

General Data

Parent Nuclides

NMR Data

Isotones und Isobares

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

General data

Name of the isotope:Hafnium-177; Hf-177Symbol:¹⁷⁷Hf or 17772HfMass number A:177 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:105Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4583333333333 (= neutron-proton ratio)Neutron excess (N-Z):33Isotopic mass:176.94323(2) u (atomic weight of Hafnium-177)Nuclide mass:176.903736 u (calculated nuclear mass without electrons)Mass excess:-52.88091 MeVMass defect:1.529988484 u (per nucleus)Nuclear binding energy:1425.17509292 MeV (per nucleus)
8.05183668 MeV (average binding energy per nucleon)Separation energy:S_N = 6.3756(10) MeV (first neutron)
S_P = 6.7873(8) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μ_N) = + 0.7935Charge radius:5.3309(31) femtometer fmYear of discovery:1934

Parent Nuclides

Direct parent isotopes are: ¹⁷⁷Ta, ¹⁷⁷Lu.

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 and parameters of the NMR active Nuclide ¹⁷⁷Hf

Isotope:¹⁷⁷Hf-NMRQuantity:18.60(16) %Spin:7/2-Nuclearmagnetic moment
μ/μ_N:+ 0.7935Gyromagnetic ratio γ:1.086 · 10⁷ rad T^-1 s^-1
1.72842 MHz T^-1Nuclear g-factor:g_l = 0.22671428571429Quadrupole moment Q:+ 3.365(29) barn (100 fm²)Resonance frequency:v₀ = 1.7282 MHz at 1 TRelative Sensitivity:[related to ¹H = 1.000]:
0.00140 (H₀ = const.)
0.8524 (v₀ = const.)

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
^177m1Hf	1315.4502(8) keV	1.09(5) s	23/2+
^177m2Hf	1342.4(10) keV	55.9(12) μs	(19/2-)
^177m3Hf	2740.02(15) keV	51.4(5) min	37/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 105) and isobaric (same nucleon number A = 177) with Hafnium-177. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 105	Isobar A = 177
63	¹⁶⁸Eu
64	¹⁶⁹Gd
65	¹⁷⁰Tb
66	¹⁷¹Dy
67	¹⁷²Ho
68	¹⁷³Er	¹⁷⁷Er
69	¹⁷⁴Tm	¹⁷⁷Tm
70	¹⁷⁵Yb	¹⁷⁷Yb
71	¹⁷⁶Lu	¹⁷⁷Lu
72	¹⁷⁷Hf	¹⁷⁷Hf
73	¹⁷⁸Ta	¹⁷⁷Ta
74	¹⁷⁹W	¹⁷⁷W
75	¹⁸⁰Re	¹⁷⁷Re
76	¹⁸¹Os	¹⁷⁷Os
77	¹⁸²Ir	¹⁷⁷Ir
78	¹⁸³Pt	¹⁷⁷Pt
79	¹⁸⁴Au	¹⁷⁷Au
80	¹⁸⁵Hg	¹⁷⁷Hg
81	¹⁸⁶Tl	¹⁷⁷Tl
82	¹⁸⁷Pb
83	¹⁸⁸Bi
84	¹⁸⁹Po
85	¹⁹⁰At