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Hafnium-177

Properties and data of the isotope 177Hf.

Contents
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Hafnium isotopes.

 

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:105Isotopic 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:SN = 6.3756(10) MeV (first neutron)
SP = 6.7873(8) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μN) = + 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 maQuantityHalf-lifeSpin
Hafnium
Isotopic mixture		178.486 u100 %
Isotope 174Hf173.94005(2) u0.16(12) %2.0(4) × 1015 a0+
Isotope 176Hf175.94141(2) u5.26(70) %stable0+
Isotope 177Hf176.94323(2) u18.60(16) %stable7/2-
Isotope 178Hf177.94371(2) u27.28(28) %stable0+
Isotope 179Hf178.94582(2) u13.62(11) %stable9/2+
Isotope 180Hf179.94656(2) u35.08(33) %stable0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 177Hf

Isotope:177Hf-NMRQuantity:18.60(16) %Spin:7/2-Nuclearmagnetic moment
μ/μN:+ 0.7935Gyromagnetic ratio γ:1.086 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.22671428571429Quadrupole moment Q:+ 3.365(29) barn (100 fm2)Resonance frequency:v0 = 1.7282 at 1 TRelative Sensitivity:0.00140 (H0 = const.)
0.8524 (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 IsomerExcitation EnergyHalf-lifeSpin
177m1Hf1315.4502(8) keV1.09(5) s23/2+
177m2Hf1342.4(10) keV55.9(12) μs(19/2-)
177m3Hf2740.02(15) keV51.4(5) min37/2-

 

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.

 

ZIsotone N = 105Isobar A = 177
63168Eu
64169Gd
65170Tb
66171Dy
67172Ho
68173Er177Er
69174Tm177Tm
70175Yb177Yb
71176Lu177Lu
72177Hf177Hf
73178Ta177Ta
74179W177W
75180Re177Re
76181Os177Os
77182Ir177Ir
78183Pt177Pt
79184Au177Au
80185Hg177Hg
81186Tl177Tl
82187Pb
83188Bi
84189Po
85190At

 

External data and identifiers

Adopted Levels, Gammas:NuDat 177Hf

 

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Last update: 2023-06-08

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