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Hafnium-174

Properties and data of the isotope 174Hf.

Content
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

See also: list of Hafnium isotopes.

 

General data

Name of the isotope:Hafnium-174; Hf-174Symbol:174Hf or 17472HfMass number A:174 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:102Isotopic mass:173.94005(2) u (atomic weight of Hafnium-174)Nuclide mass:173.900556 u (calculated nuclear mass without electrons)Mass excess:-55.84307 MeVMass defect:1.507173736 u (per nucleus)Nuclear binding energy:1403.92329204 MeV (per nucleus)
8.06852467 MeV (average binding energy per nucleon)Separation energy:SN = 8.504(28) MeV (first neutron)
SP = 6.2525(22) MeV (first proton)Half-life:2.0(4) × 1015 aDecay constant λ:1.098977645484 × 10-23 s-1Specific activity α:0.038255480826757 Bq g-1
1.033931914236 × 10-12 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.3201(35) femtometer fmYear of discovery:1939

 

Radioactive Decay

Half-life T½ = 2.0(4) × 1015 a respectively 6.3072 × 1022 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
α170Yb100 %2.4945(23) MeV

 

Parent Nuclides

Direct parent isotope is: 174Ta.

 

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+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 102) and isobaric (same nucleon number A = 174) with Hafnium-174. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 102Isobar A = 174
60162Nd
61163Pm
62164Sm
63165Eu
64166Gd
65167Tb
66168Dy174Dy
67169Ho174Ho
68170Er174Er
69171Tm174Tm
70172Yb174Yb
71173Lu174Lu
72174Hf174Hf
73175Ta174Ta
74176W174W
75177Re174Re
76178Os174Os
77179Ir174Ir
78180Pt174Pt
79181Au174Au
80182Hg174Hg
81183Tl
82184Pb
83185Bi
84186Po

 

External data and identifiers

Adopted Levels, Gammas:NuDat 174Hf

 

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Last update: 2020-10-20

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